[PR] リフォーム リビング
Yukihiro Ota
[English / Japanese]
[
Digital Materials Laboratory

RIKEN
]
[
Nakahara Lab

Kinki University
]
NOTE:
Now I am workding at
DML(Degital Meterials Lab), RIKEN, Japan
as a Special Postdoctoral Researcher.
Affiliation: Digital Materials Laboratory,
Advanced Science Institute, RIKEN
Title: Postdoctoral fellow
Location: 21 Hirosawa, Wakoshi, Saitama 3510198, JAPAN
email: otayuki _AT_ riken.jp
OR yota _AT_ alice.math.kindai.ac.jp
Research: Theory of Foundation of
Quantum Mechanics Connection between Quantum and Classical
Region ?
I have a strong interest in various topics about foundation of quantum mechanics;
quantumclassical correspondence (QCC), entanglement, and decoherence.
I'm interested in the following topics recently
interface between quantum optics and superconductors,
multigap superconductor,
Febased superconductor,
highTc scupercondoctor,
intrinsic Josephson junctions,
quantum simulation,
topological quantum computing,
entanglement in mutiqubit system and the classification,
decoherence,
geometrical phase and its application to QIPs,
vortex, etc.
Table of Contents
Paper

Yukihiro Ota, Keita Kobayashi, Masahiko Machida,
Tomio Koyama, and Franco Nori,
``Full numerical simulations of dynamical response in superconducting
singlephoton detectors,''
IEEE Trans on Appl. Supercond. 23, 2201105 (2013)
Invited oral talk in
ASC2012

Keita Kobayashi, Masahiko Okumura, Yukihiro Ota, Susumu Yamada,
and Masahiko Machida
``Nontrivial Haldane Phase of an Atomic TwoComponent Fermi
Gas Trapped in a 1D Optical Lattice,''
Phys. Rev. Lett. 109, 235302 (2012) [5 pages]

Wei Cui, Neill Lambert, Yukihiro Ota, XinYou Lu,
Z.L. Xiang, J. Q. You, and Franco Nori
``Confidence and backaction in the quantum filter equation,''
Phys. Rev. A 86, 052320 (2012) [8 pages]

Yukihiro Ota, Sahel Ashhab, Franco Nori
``Entanglement amplification via local weak measurements,''
J. Phys. Math. A:Math. Theore. 45, 415303 (2012) [13pp]

Yukihiro Ota, Sahel Ashhab, Franco Nori
``Implementing general measurements on linear optical
and solidstate qubits,''
Phys. Rev. A 85, 043808 (2012) [7 pages] (5 April 2012)

Yuki Nagai, Yukihiro Ota, Masahiko Machida
``Efficient Numerical Selfconsistent Meanfield Approach
for Fermionic Manybody Systems by Polynomial Expansion
on Spectral Density,''
J. Phys. Soc. Jpn. 81 024710 (2012) (6 pages)

Yuji Tanaka, Tsubasa Ichikawa, Masahito TadaUmezaki,
Yukihiro Ota, Mikio Nakahara,
``Quantum Oracles in Terms of Universal Gate Set,''
Int. J. Quant. Info 9, 13631381 (2011)

Tomio Koyama, Hideki Matsumoto, Masahiko Machida, and Yukihiro Ota,
``Multiscale simulation for terahertz wave emission from
the intrinsic Josephson junctions,''
Supercond. Sci. Technol. 24, 085007 (August, 2011)

Tomio Koyama, Yukihiro Ota, and Masahiko Machida,
``Resonance effect in the voltage state of intrinsic Josephson
junction stacks with multiple tunneling channels,''
Phys. Rev. B 83, 220501(R) (June, 2011)

Yukihiro Ota, Masahiko Machida, Tomio Koyama
``Variety of caxis collective excitations in layered multigap superconductors''
Phys. Rev. Lett. 106, 157001 (April, 2011)

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideo Aoki,
Collective Modes in Multiband Superfluids and Superconductors:
Multiple Dynamical Classes
Phys. Rev. B 83, 060507(R) (2011) [4 pages]
published 23 February 2011

Yukihiro Ota, Masahiko Machida, Tomio Koyama
``Macroscopic quantum tunneling in multigap superconducting
Josephson junctions: Enhancement of escape rate via quantum
fluctuations of JosephsonLeggett mode''
Phys. Rev. B 83, 060503(R) (2011) [4 pages]
published 9 February 2011

Yukihiro Ota, Masahiko Machida, and Tomio Koyama
Shapiro Steps as a Direct Probe of $\pm s$wave Symmetry in
Multigap Superconducting Josephson Junctions,
Phys. Rev. B 82, 140509(R) (2010) [4 pages]
published 26 October 2010

Noriyuki Nakai, Hiroki Nakamura, Yukihiro Ota, Yuki Nagai, Nobuhiko Hayashi,
and Masahiko Machida,
``Firstprinciplesbased $\pm s$wave modelling for ironbased superconductors:Studies for specific heat and nuclear magnetic relaxation rate'',
Phys. Rev. B 82, 094501 (September, 2010) [5 pages]

Yukihiro Ota, Noriyuki Nakai, Hiroki Nakamura, Masahiko Machida,
Daisuke Inotani, Yoji Ohashi, Tomio Koyama, Hideki Matsumoto,
``AmbegaokarBaratoff Relations of Josephson Critical Current in Heterotic
Junctions with Multigap Superconductors'',
Phys. Rev. B 81, 214511 (2010).
Virtual Journal of Applications of Superconductivity Volume 18 Issue 2

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideki Matsumoto,
``Theory for Josephson vortex structure in Josephson junctions with multiple tunneling channels: Vortex enlargement as a probe for $\pm$swave superconductors''
Phys. Rev. B 81, 014502 (2010)
Virtual Journal of Applications of Superconductivity Volume 18, Issue 2

Yukihiro Ota, Yoshito Goto, Yasusi Kondo, Mikio Nakahara,
``Geometric quantum gates in liquidstate NMR based on a cancellation of dynamical phases''
Phys. Rev. A 80, 052311 (2009)
Virtual Journal of Quantum Information Volume 9, Issue 11

Yukihiro Ota, Masahiko Machida, and Tomio Koyama,
``Intergrain Josephson Currents in Multigap Superconductors: A Microscopic Origin of Low Intergrain Critical Current and Its Recovery Potential in Ironpnictide Materials''
J. Phys. Soc. Jpn. 78, 103701 (2009).

Yukihiro Ota and Yasushi Kondo,
``Composite pulses in NMR as nonadiabatic geometric quantum gates''
Phys. Rev. A 80, 024302 (2009).
Virtual Journal of Quantum InformationVolume 9, Issue 8

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideki Matsumoto
``Theory of heterotic SIS Josephson junctions between single and multigap superconductors''
Phys. Rev. Lett. 102, 237003 (2009).
Virtual Journal of of Applications of Superconductivity Volume 16, Issue 12 (2009)

Natsuko Ishida, Yukihiro Ota, Yoshihisa Yamamoto,
``Generation and application of multipath cat states of light''
New J. Phys. 11 033007 (2009).

Yukihiro Ota, Masamitsu Bando, Yasusi Kondo, Mikio Nakahara,
``Implementation of holonomic quantum gates by an isospectral deformation of an Ising dimer chain''
Phys. Rev. A 78, 052315 (November 2008).
Virtual Journal of Quantum Information Volume 8, Issue 11 (Nov. 2008)

Yukihiro Ota, Shuji Mikami, Motoyuki Yoshida, Ichiro Ohba,
``Attainable Entanglement of Unitary Transformed Thermal States in Liquidstate Nuclear Magnetic Resonance with the Chemical Shift'',
J. Phys. A: Math. Theor. 40, 1426314277 (November 2007).

Yukihiro Ota, Shuji Mikami, and Ichiro Ohba,
``Potential Errors in a Scheme of
Universal Quantum Gates in Kane's Model'',
Phys. Rev. A 73, 032321 (March 2006).
Virtual Journal of Quantum Information Volume 6, Issue 4 (April 2006)

Yukihiro Ota and Ichiro Ohba,
``Crossover from classical to quantum behavior of the Duffing oscillator
through a pseudoLyapunovexponent'',
Phys. Rev. E 71, 015201(R) (January 2005).
 Hiroyuki Hayashi, Gen Kimura and Yukihiro Ota,
``Kraus representation in the presence of initial correlations'',
Phys. Rev. A 67, 062109 (June 2003).
Preprint

Yuki Nagai, Yasushi Shinohara, Yasunori Futamura,
Yukihiro Ota, and Tetsuya Sakurai,
``Numerical construction of a lowenergy effective Hamiltonian
in a selfconsistent Bogoliubovde Gennes approach of superconductivity,''
arXiv:103.3683

Wei Cui, Neill Lambert, Yukihiro Ota, XinYou Lu,
Z. L. Xiang, J. Q. You, Franco Nori
``Confidence and Backaction in the Quantum Filter Equation''
arXiv:1207.3942

Yukihiro Ota, Sahel Ashhab, Franco Nori
``Methods for implementing general measurements on
linear optical and solidstate qubits,''
arXiv:1201.2234

Yukihiro Ota, Sahel Ashhab, Franco Nori
``Entanglement amplification via local weak measurements,''
arXiv:1201.2232

Yuki Nagai, Yukihiro Ota, Masahiko Machida
``Efficient Numerical Selfconsistent Meanfield Approach
for Fermionic Manybody Systems by Polynomial Expansion
on Spectral Density,''
arXiv:1105.4939

Yukihiro Ota, Masahiko Machida, Tomio Koyama
``Variety of caxis collective excitations in layered multigap superconductors''
arXiv:1101.0886

Yukihiro Ota, Masahiko Machida, Tomio Koyama
``Macroscopic quantum tunneling in multigap superconducting
Josephson junctions: Escape rate enhancement via quantum
fluctuations of JosephsonLeggett mode''
arXiv:1010.2804

Yuji Tanaka, Tsubasa Ichikawa, Masahito TadaUmezaki,
Yukihiro Ota, Mikio Nakahara,
``Quantum Oracles in Terms of Universal Gate Set,''
arXiv:1008.4643

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideo Aoki,
Leggett's Collective Modes in Multiband Superfluids and Superconductors:
Multiple Dynamical Classes
arXiv:1008.3212

Yukihiro Ota, Masahiko Machida, and Tomio Koyama
Novel Shapiro Steps as a Direct Probe of $\pm s$wave Symmetry in
Multigap Superconducting Josephson Junctions,
arXiv:1006.2184

Yukihiro Ota, Noriyuki Nakai, Hiroki Nakamura, Masahiko Machida,
Daisuke Inotani, Yoji Ohashi, Tomio Koyama, Hideki Matsumoto,
``AmbegaokarBaratoff Relations of Josephson Critical Current in Heterotic
Junctions with Multigap Superconductors'',
arXiv:1004.0044

Noriyuki Nakai, Hiroki Nakamura, Yukihiro Ota, Yuki Nagai, Nobuhiko Hayashi,
and Masahiko Machida,
``Firstprinciplesbased $\pm s$wave modelling for ironbased superconductors:Studies for specific heat and nuclear magnetic relaxation rate'',
arXiv:0909.1195

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideki Matsumoto,
``Theory for Josephson vortex structure in Josephson junctions with multiple tunneling channels: Vortex enlargement as a probe for $\pm$swave superconductors''
arXiv:0907.0277

Yukihiro Ota, Yoshito Goto, Yasusi Kondo, Mikio Nakahara,
``Demonstration of geometric quantum gates in liquidstate NMR based on a cancellation of dynamical phases''
arXiv:0906.0474

Yukihiro Ota, Masahiko Machida, and Tomio Koyama
``Theory of intergrain Josephson currents in multigap superconductors: A scenario of low critical currents in polycrystalline ironpnictide superconductors'',
arXiv:0905.3592

Yukihiro Ota and Yasushi Kondo,
``Composite pulses in NMR as nonadiabatic geometric quantum gates''
arXiv:0903.2295

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideki Matsumoto
``Theory of heterotic SIS Josephson junctions between single and multigap superconductors''
arXiv:0903.0421

Yukihiro Ota, Masamitsu Bando, Yasusi Kondo, Mikio Nakahara,
``Implementation of holonomic quantum gates by an isospectral deformation of an Ising dimer chain''
arXiv:0809.1705

Yukihiro Ota, Motoyuki Yoshida, Ichiro Ohba,
``Decrease of entanglement by local operations in the DuerCirac method''
arXiv:0704.1375 [quantph]

Yukihiro Ota, Shuji Mikami, Motoyuki Yoshida, Ichiro Ohba,
``Attainable Entanglement of Unitary Transformed Thermal States
in Liquidstate Nuclear Magnetic Resonance with the Chemical Shift'',
quantph/0612158

Yukihiro Ota, Shuji Mikami, and Ichiro Ohba,
``Potential Errors in a Scheme of Universal Quantum Gates in Kane's Model'',
quantph/0509096
 Yukihiro Ota and Ichiro Ohba,
``Crossover from classical to quantum behavior of Duffing oscillator
through "pseudoLyapunov exponent"'',
quantph/0308154.
 Hiroyuki Hayashi, Gen Kimura and Yukihiro Ota,
``Kraus representation in the presence of initial correlations'',
quantph/0303061.
Workshops, Conferences

Yukihiro Ota, Sahel Ashhab, and Franco Nori,
``Implementing general quantum measurements on linear optical
and solidstate qubits,''
APS March Meeting 2013, F26.00012
Baltimore, Maryland, US, March 1822 (2013).

Yukihiro Ota, Keita Kobayashi, Masahiko Machida, Tomio Koyama,
and Franco Nori,
``Full numerical simulations of dynamical response in
superconducting singlephoton detectors,''
[Invited oral talk]
Applied Superconductivity Conference 2012 (ASC2012)
, 3EF01
Oregon Convention Center, Portland, Oregon, US, Oct. 1712 (2012)

Yukihiro Ota, Masahiko Machida, Tomio Koyama, and Franco Nori,
``Macroscopic quantum tunneling in long junctions with
twoband superconductors,''
2012 JPS Autumn Meeting, 19aAF8
Yokohama National Univ., Yokohama, Japan, Sep 1821, 2012

Yukihiro Ota, Sahel Ashhab, and Franco Nori,
``Systematic approaches for implementation of general measurements
in linear optical and solidstate qubits, ''
The 26th Quantum Information Technology Symposium (QIT26)
Fukui Univ., Fukui, Japan, May 2122, 2012

Yukihiro Ota, Sahel Ashhab, and Franco Nori,
''Entanglement concentration via local unsharp measurements,''
JPS 67th Annual Meeting: 27aBE1
Kanseigakuin Univ., Nishinomiya, Hyougo, Japan, Mar 2427, 2012

Keita Kobayashi, Masahiko Okumura, Yukihiro Ota, Susumu Yamada, and
Masahiko Machida,
''Haldane Phase of Ultra Cold Atom Gas Loaded on PseudoOneDimensional
Optical Lattice,''
JPS 67th Annual Meeting: 24aBA5
Kanseigakuin Univ., Nishinomiya, Hyougo, Japan, Mar 2427, 2012

Yukihiro Ota, Keita Kobayashi, Masahiko Machida,
Tomio Koyama, and Franco Nori,
''Numerical simulation of dynamical response in
superconducting quantum detectors,''
APS March Meeting 2012: Y26.00012
Boston Convention Center, Boston, MA, USA, Feb 27Mar 2, 2012

Keita Kobayashi, Masahiko Okumura, Yukihiro Ota, Susumu Yamada, and
Masahiko Machida,
''Haldane Phase of Ultra Cold Atom Gas Loaded on PseudoOneDimensional
Optical Lattice,''
APS March Meeting 2012: P4.00006
Boston Convention Center, Boston, MA, USA, Feb 27Mar 2, 2012

Yukihiro Ota, Masahiko Machida, Tomio Koyama, and Franco Nori
''MQT in Josephson junctions with twoband superconductors:
Role of relative phase modulation,''
Vortex 2011
National Institute for Materials Science, Tsukuba, Japan, Dec 79, 2011

Yukihiro Ota, Masahiko Machida, Tomio Koyama, and Franco Nori
``Direct numerical simulation for nonequilibrium transport
phenomena in superconducting detectors,''
24th International Symposium on Superconductivity (ISS2011)
Tower Hall Funabori, Tokyo, Japan, Oct 2426, 2011

Yuki Nagai, Yukihiro Ota, and Masahiko Machida
``Spectraldensity polynomial expansion for
twoparticle Green's function in BdG framework,''
24th International Symposium on Superconductivity (ISS2011)
Tower Hall Funabori, Tokyo, Japan, Oct 2426, 2011

Keita Kobayashi, Yukihiro Ota, and Masahiko Machida
``Numerical experiments of Joule heat damage in
superconducting transport,''
24th International Symposium on Superconductivity (ISS2011)
Tower Hall Funabori, Tokyo, Japan, Oct 2426, 2011

Yukihiro Ota, Masahiko Machida, Tomio Koyama
``Longitudinal collective excitations in multigap
intrinsic Josephson junction arrays,''
2011 JPS Autumn Meeting, 24aGH12
Toyama Univ., Toyama, Japan, Sep 2114, 2011

Yukihiro Ota
``Dynamical aspects of multiband superconductors:
Peculiar Josephson effects and collective excitations,''
[Invited talk]
2011 JPS Autumn Meeting, 22aGM6
Toyama Univ., Toyama, Japan, Sep 2114, 2011

Yukihiro Ota, Masahiko Machida, and Tomio Koyama
``Longitudinal Collective Excitations in Intrinsic Josephson
Junction Stacks with Two Tunneling Channels,''
26th International Conference on Low Temperature Physics (LT26)
Beijing, China, August 1017, 2011

Yukihiro Ota, Masahiko Machida, and Tomio Koyama,
``Enhancement of macroscopic quantum tunneling in Josephson
junctions with multigap superconductors through zeropoint fluctuations
of JosephsonLeggett mode,''
APS March Meeting 2011, V23.00012
Dallas Convention Center, Dallas, Texas, USA, March 2125, 2011

Yukihiro Ota, Masahiko Machida, and Tomio Koyama,
``Theory of phase dynamics in intrinsic Josephson junctions with
multigap superconducting layers,''
23rd International Symposium on Superconductivity (ISS2010)
Epochal Tsukuba, Tsukuba, Japan, November 13, 2010.
Accepted for publication in Physica C

Tomio Koyama, Hideki Matsumoto, Yukihiro Ota, and Masahiko Machida
``Numerical study for electromagnetic wave emission in intrinsic Josephson junctions''
23rd International Symposium on Superconductivity (ISS2010)
Epochal Tsukuba, Tsukuba, Japan, November 13, 2010.
Accepted for publication in Physica C

Yukihiro Ota, Masahiko Machida, and Tomio Koyama,
``Theory of AC Josephson effects in SIS Josephson junctions with
multiple superconducting gaps'',
JPS 2010 Autumn Meeting, 23pXB8, Osaka Pref. Univ., Osaka, Japan,
September 2010.

Yukihiro Ota, Masahiko Machida, and Tomio Koyama,
``Macroscipic quantum tunneling in Josephson junctions
with multigap superconductors'',
JPS 2010 Autumn Meeting, 23aWQ8, Osaka Pref. Univ., Osaka, Japan,
September 2010.

Yukihiro Ota, Masahiko Machida, and Tomio Koyama,
``Theory for macroscipic quantum tunneling in Josephson junctions
with twogap superconductors: Corrections from Leggett's mode'',
Summer School on Diversities in Quantum Computation/Information
Kinki Univ., HigashiOsaka, Japan, August 15, 2010.

Yukihiro Ota, Masahiko Machida, and Tomio Koyama,
``Theory of Josephson effects in ironbased multigap superconductor junctions'',
DubnaNano2010
Bogoliubov Institute for Theoretical Physics, Dubna, Russia, July 510, 2010
[Invited talk]
J. Phys.:Conf. Ser. 248, 012040 (2010).

Yuji Tanaka, Tsubasa Ichikawa, Masato TadaUmezaki, Yukihiro Ota,
and Mikio Nakahara,
``Quantum Circuit for Quantum Bioinfomatic Database Search Algorithm'',
The 22th Quantum Information Technology Symposium (QIT22)
Osaka University, Osaka, Japan, May 1011, 2010.

Yukihiro Ota, Masahiko Machida, Tomio Koyama, and Hideki Matsumoto,
``Theory of Josephson Effects in Josephson Junctions with Multiple Tunneling Channels:
Phase Sensitive Tests for Ironpnictide Superconductors'',
7th International Symposium on Intrinsic Josephson Effects and Plasma
Oscillations in HighTc Superconductors (PLASMA 2010)
Hirosaki University, Hirosaki, Japan ,April 29  May 2, 2010.
[Invited talk]

Yukihiro Ota, Masahiko Machida, Tomio Koyama,
``Theory of charge dynamics in an array of intrinsic
Josephson junctions with multigap superconductors'',
CREST 2010 International Symposium on Physics of
Quantum Technology, 8TH41,
Hitotsubashi Memorial Hall, Tokyo, Japan, April 69 2010.

Yukihiro Ota, Masahiko Machida, Tomio Koyama , and Hideo Aoki,
``Leggett's collective modes in multiband superconductivity''
The 65th JPS Annual Meeting, 21pGH5, Okayama University,
Okayama, Japan, March 2010.

Yukihiro Ota, Noriyuki Nakai, Hiroki Nakamura, Mashiko Machida,
Daisuke Inotani, Yoji Ohashi, Tomio Koyama, and Hideki Matsumoto,
``Theory of ac Josephson effects in multiple tunneling junctions:
A probe of $\pm s$wave in ironbased superconductors'',
APS March Meeting 2010, H39.00008
Oregon Convention Center in Portland, Portland, Oregon, USA

Yukihiro Ota, Masahiko Machida, Tomio Koyama, and Hideo Aoki,
``Leggett's collective modes in multiband superconductors:
multiple dynamical classes`',
APS March Meeting 2010, K1.00100
Oregon Convention Center in Portland, Portland, Oregon, USA

Yukihiro Ota, Masahiko Machida, Tomio Koyama, and Hideki Matsumoto,
``Propagation and Reflection Properties of External Electromagnetic
Waves in Josephson Junctions'',
First JSTDFG Workshop on Terahertz Superconductor Electronics
Tukubasan Keisei Hotel, Tsukuba, Japan, February 2124, 2010.

Tomio Koyama, Yukihiro Ota, Masahiko Machida
``AC Josephson Effects and Leggett's Modes in
Twogap Intrinsic Josephson Junction Stacks''
VPWJ2009
Osaka Prefecture University , Osaka, Japan, December 13, 2009.

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideo Aoki,
``Collective Excitation Modes in Multiband Superconductors''
VPWJ2009
Osaka Prefecture University , Osaka, Japan, December 13, 2009.

Tomio Koyama, Yukihiro Ota, Masahiko Machida
``Intrinsic Josephson Junction Stacks with Multigap Superconductors''
Workshop on Superconducting Computing Device (RIEC Workshop, H21A04)
Research Institute of Electrical Communication, Tohoku University, Sendai, Japan,
November 2627, 2009.

Yukihiro Ota, Nobuyuki Nakai, Hiroki Nakamura, Masahiko Machida, Daisuke Inotani,
Yoji Ohashi, Tomio Koyama, Hideki Matsumoto
``Shapiro steps in heterotic SIS multitunnelingchannel Josephson
junctions: Identification of $\pm$swave in ironpnictide superconductors''
Workshop on Superconducting Computing Device (RIEC Workshop, H21A04)
Research Institute of Electrical Communication, Tohoku University, Sendai, Japan,
November 2627, 2009.

Yukihiro Ota and Yasushi Kondo
``Composite pulses in NMR as nonadiabatic geometric phase gates''
The 21st Quantum Information Technology Symposium (QIT21)
the University of ElectroCommunications, Tokyo, Japan, November 45, 2009.

Tomio Koyama, Yukihiro Ota, Masahiko Machida
``IV Characteristics in Multigap Intrinsic Josephson Junction Stacks''
22th International Symposium on Superconductivity (ISS2009)
Epochal Tsukuba, Tsukuba, Japan, November 24, 2009.
Physica C 470, 14811484 (2010).

Yukihiro Ota, Masahiko Machida, Tomio Koyama, and Hideki Matsumoto
``Anomalous Josephson vortex solutions in Josephson junctions with
multiple tunneling channels'',
22th International Symposium on Superconductivity (ISS2009)
Epochal Tsukuba, Tsukuba, Japan, November 24, 2009.
Physica C 470, 11371140 (2010).

Yukihiro Ota, Masamitsu Bando, Yasushi Kondo, and Mikio Nakahara,
``Holonomic Quantum Computing in a Dimerchain Model via Isingtype Interaction''
Dynamics and Manipulaiton of Quantum Systems 2009
Koshiba Hall, Univ. of Tokyo, Tokyo, Japan, October 1316, 2009.

Noriyuki Nakai, Hiroki Nakamura, Michiyasu Miyashita, Yuki Nagai, Yukihiro Ota,
Nobuhiko Hayashi, and Masahiko Machida,
``Temperature dependence of specific heat in multigap superconductors''
2009 Autumn Meeting, 28pRH12, Kumamoto University, Kumamoto, Japan, September 2009.

Yukihiro Ota, Masahiko Machida, and Tomio Koyama,
``Microscopic analysis of intergrain Josephson currents in
polycrystalline ironpnicide superconductors''
2009 Autumn Meeting, 25aRH8, Kumamoto University, Kumamoto, Japan, September 2009.

Yukihiro Ota, Masahiko Machida, Tomio Koyama, and Hideki Matsumoto
``Vortex solutions in Josephson junctions with multiple tunneling channels''
2009 Autumn Meeting, 25aYA4, Kumamoto University, Kumamoto, Japan, September 2009.

Yukihiro Ota, Masahiko Machida, Tomio Koyama, and Hideki Matsumoto
``Collective Modes and Josephson Vortices in a Heterotic Josephson
junction between Single and Twogap Superconductors'',
9th International Conference on Materials and Mechanisms of Superconductivity,
PSG571, Keio Plaza Hotel, Tokyo, Japan, September 7th12th, 2009.
Physica C 470, Supplement 1, S882 (December, 2010).

Masahiko Machida,Yukihiro Ota, Noriyuki Nakai, Tomio Koyama,
and Hideki Matsumoto,
``Phenomenological Theory for $\pm$Swave Superconducting States of
Ironbased Superconductors''
9th International Conference on Materials and Mechanisms of Superconductivity,
PSB512, Keio Plaza Hotel, Tokyo, Japan, September 7th12th, 2009.
Physica C 470, Supplemen 1, S372 (December, 2010)
.

Noriyuki Nakai, Hiroki Nakamura, Yukihiro Ota, Nobuhiko Hayashi, and Masahiko Machida,
``Small Jump of Specific Heat and Small Gap in Iron Pnictide Superconductors''
9th International Conference on Materials and Mechanisms of Superconductivity,
PSB392, Keio Plaza Hotel, Tokyo, Japan, September 7th12th, 2009.
Physica C 470, Supplemen 1, S368 (December, 2010)
.

Yukihiro Ota, Masahiko Machida, and Tomio Koyama
``Intergrain Josephson Currents in Twogap Superconductors'',
9th International Conference on Materials and Mechanisms of Superconductivity,
PSB349, Keio Plaza Hotel, Tokyo, Japan, September 7th12th, 2009.
Physica C 470, Supplemen 1, S489 (December, 2010)

Yukihiro Ota, Masahiko Machida, Tomio Koyama, and Hideki Matsumoto
``Peculiar Josephson vortex structure for $\pm$swave in Josephson junctions with multiple tunneling channels'',
New directions of superconducting nanostructures 2009,
Nagoya University, Nagoya, Japan, September 4 and 5, 2009.

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideo Aoki
``Leggett's mode in multiband superconductors'',
New Developments in Theory of Superconductivity,
Institute for Solid State Physics, Univ. of Tokyo, Kashiwa, Japan, July 8th10th, 2009.

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideki Matsumoto
``Theory of Josephson junctions between single and twogap superconductors: Identification of + swave symmetry via basic Josephson effects'',
International Workshop on the Search for New Superconductors: Frontier and Future,
Shonan Village Center, Hayama Japan, May 12th16th, 2009.

Noriyuki Nakai, Yukihiro Ota, Nobuhiko Hayashi, and Masahiko Machida,
``Numerical simulation of TDGL equation for multigap superconductors
with vortexline pinning''
The 64th JPS Annual Meeting, 30aTA4, Rikyo University, Tokyo, Japan, March 2009

Yukihiro Ota, Masahiko Machida, Tomio Koyama, Hideki Matsumoto,
``Theory of SIS Josephson junctions between single and twogap superconductors''
The 64th JPS Annual Meeting, 27aYJ5, Rikyo University, Tokyo, Japan, March 2009

Masahiko Machida, Yuki Nagai, Yukihiro Ota, Hiroki Nakamura, Noriyuki Nakai, Masahiko Okumura, and Nobuhiko Hayashi,
``$\pm$ swave Scenario in Ironbased Superconductors: Thermodynamics
and Josephson Effects'',
International Workshop on Iron Related HighTc Superconductors,
CCSE, JAEA, Tokyo Japan, Jan. 25 2009.

Yukihiro Ota and Yasushi Kondo,
``Composite pulses in NMR as geometrcal quantum gates''
2008 Autumn Meeting, 20aZD3, Iwate University, Iwate, Japan, September 2008.

Yukihiro Ota, Yasushi Kondo, Mikio Nakahara,
``Robustness of nonadiabatic geometrical quantum gates
from the viewpoint of composite pulses''
International Iran Summer School on Quantum Information 2008,
Kish University, Kish, Iran, 1327 September, 2008.

Yukihiro Ota,
``Composite Pulses as Geometric Quantum Gates''
Symposium on Decoherence Suppression in Quantum Systems,
Oxford Kobe Institute, Kobe, Japan, 710 September, 2008.

Yukihiro Ota, Masamitsu Bando, Yasushi Kondo, and M. Nakahara,
``Holonomic Quantum Gates using Isospectral Deformations of Ising Model''
8th Asian Conference on Quantum Information Science,
KIAS, Seoul, Korea, 2730 August, 2008.

Yukihiro Ota, Masamitsu Bando, Yasushi Kondo, and M. Nakahara,
``Holonomic quantum gates in an isospectral deformation of Ising model''
The 18th Quantum Information Technology Symposium (QIT18),
QIT200827, Koshiba Hall, Univ. of Tokyo, Tokyo, 2223 May, 2008.

Masamitsu Bando, Yukihiro Ota, Yasushi Kondo, Mikio Nakahara,
``Holonomic quantum computing in a dimer model'',
The 63th JPS Annual Meeting, 26aRF10, Kinki Univ., HigashiOsaka, Japan, March 2008.

Yoshito Goto, Yukihiro Ota, Yasushi Kondo, Mikio Nakahara,
``Implementation of geometrical quantum gates by a twoloop
method in liquidstate NMR systems'',
The 63th JPS Annual Meeting, 26aRF9, Kinki Univ., HigashiOsaka, Japan, March 2008.

Yukihiro Ota, Yasushi Kondo, and Mikio Nakahara,
``Implementation of geometrical quantum gates by a twoloop
method in liquidstate NMR systems'',
The 17th Quantum Information Technology Symposium (QIT17), QIT200788,
the Sanyo Shinbun SANTA Hall, Okayama, Nov. 2122, 2007.

Yukihiro Ota, Shuji Mikami, and Ichiro Ohba,
``Errors in a plausible scheme of quantum gates in Kane's model'',
Symposium on Physical Realization of Quantum Computing:
Superconducting and Molecular Qubits
,
Yutorito HigashiOsaka, HigashiOsaka, Oct. 31  Nov. 2, 2007.
 Motoyuki Yoshida, Yukihiro Ota, Ichiro Ohba,
``A Certain Class of Threequbit States Valid for the DuerCirac method''
The 62th Annual Meeting, 24aRG4, Hokkaido University, Hokkaido, Japan, September 2007.

Yukihiro Ota, Motoyuki Yoshida, and Ichiro Ohba,
``Notes on the DuerCirac classification'',
Summer School on Mathematical Aspects of Quantum Computing
,
Kinki University, HigashiOsaka, Aug. 2729, 2007.
 Yukihiro Ota, Motoyuki Yoshida, Ichiro Ohba,
``Decrease of entanglement by the local operations in the DuerCirac method''
2007 Spring Meeting, 19pXG5, Kagoshima University, Kagoshima, Japan, March 2007.

Yukihiro Ota, Shuji Mikami, and Ichiro Ohba,
``Entanglement generation from thermal state with low symmetry
by quantum gates in liquidstate nuclear magnetic resonance'',
Quantum Mechanics: from Fundamental Problems to Applications
,
Centro Residenziale Universitario, Bertinoro, Italy, Dec. 47, 2006.

Yukihiro Ota, Shuji Mikami, and Ichiro Ohba,
``Entanglement for unitary transformed thermal states in liquid state
NMR with chemical shift''
The 15th Quantum Information Technology Symposium, QIT200695,
Campus Plaza Kyoto, Nov 2122, 2006.
 Yukihiro Ota, Shuji Mikami, and Ichiro Ohba,
``Classification of quantum gates from generation of entanglement in liquid state NMR''
2006 Autumn Meeting, 25pRB5, Chiba University, Chiba, Japan, September 2006.

Yukihiro Ota and Ichiro Ohba,
``Direct Derivation of Nonseparable Regions for Bell Unitary Transformed
Thermal States in Liquid State NMR''
International Conference on Quantum Mechanics and Chaos,
Osaka City University, Japan, Sep. 1921, 2006.
 Yukihiro Ota, Shuji Mikami, and Ichiro Ohba,
``Bell unitary transformed thermal states between
distillable and separable regions in liquid state NMR'',
Conference on Quantum Information and Quantum Control II
,
Fields Institute, University of Totonto, Canada, August 811, 2006.

Yukihiro Ota, Shuji Mikami, Ichiro Ohba,
``Negativity and Entanglable Regions of BellUnitary Transformed Thermal States''
The 14th Quantum Information Technology Symposium, QIT200626,
Tokyo Institute of Technology, May 2930, 2006

Yukihiro Ota, Shuji Mikami, Ichiro Ohba,
``Errors in a Standard Scheme of Quantum Gates for Kane's Model'',
2005 Symposium on Nanoscale Materials, Processes and Devices
,
Hapuna Beach Prince Hotel, Hawaii, USA, November 24, 2005.

Yukihiro Ota, Shuji Mikami, and Ichiro Ohba,
``Possibility of considerable errors for quantum gates by
instantaneous controlling schemes in the Kane's model'',
2005 Autumn Meeting, 22aWA12, Doshisha University, Kyoto, Japan, September 2005.

Yukihiro Ota, Shuji Mikami, and Ichiro Ohba
``An Error Estimation of the Quantum Gates by Instantaneous
Controlling Processes in Kane's Model'',
The 12th Quantum Information Technology Symposium,QIT200531,
NTT Basic Research Laboratories, May 1213, 2005.

Yukihiro Ota, Shuji Mikami, and Ichiro Ohba,
``Errors through Nonadiabatic Transitions in the SiliconBased Nuclear
Spin Quantum Computer''
Workshop YITPW0414
``Chaos and Nonlinear Dynamics in QuantumMechanical and Macroscopic Systems Program''
,
Yukawa Institute for Theoretical Physics, Kyoto University, Japan, December 810, 2004.
 Shuji Mikami, Yukihiro Ota, Ichiro Ohba,
``Existence of Errors in kane's Proposal for Spinflip Operations'',
The Eleventh Quantum Information Technology Symposium
, QIT200488,
Kyoto University, December 67, 2004.

Shuji Mikami, Yukihiro Ota, and Ichiro Ohba,
``Applicability of quantum gates in the siliconbased nuclear spin
quantum computer II'',
2004 Autumn Meeting, 15pTF8, Aomori University, Aomori, Japan, September 2004.
 Yukihiro Ota, Shuji Mikami, and Ichiro Ohba,
``Quantum gates in Kane's model based on adiabatic controlling processes
and verification of its physical realization'',
Quantum Information and Quantum Control Conference,
the University of Toronto and the Fields Institute, Toronto, Canada, July 1923, 2004.
 Yukihiro Ota, Shuji Mikami, Ichiro Ohba,
``Construction of Quantum Operations and Estimation of the Error in Kane's Model'',
The Tenth Quantum Information Technology Symposium,QIT200433,
Gakushuin University, May 2425, 2004.

Yukihiro Ota and Ichiro Ohba,
``Applicability of quantum gates in the siliconbased nuclear spin
quantum computer'',
The 59th Annual Meeting, 30pXG6, Kyushu University, Kyushu, Japan, March 2004.
 Yukihiro Ota and Gen Kimura,
``Relationship between quantum states and measured quantities'',
2003 Autumn Meeting, 23pTF6, Okayama University, Okayama, Japan, September 2003.

Hiroyuki Hayashi, Gen Kimura, and Yukihiro Ota,
``Relationship between the initial correlation and the complete
positivity in open quantum systems'',
2003 Autumn Meeting, 22aTF7, Okayama University, Okayama, Japan, September 2003.
 Hiroyuki Hayashi, Gen Kimura, and Yukihiro Ota,
``The reduced dynamics in the presence of initial correlations'',
ERATO Quantum Computation and Information Science 2003
,
Niijimakaikan, Kyoto, Japan, September 46, 2003.
 Yukihiro Ota and Ichiro Ohba,
``Crossover from classical to quantum behaviour of Duffing oscillator
through PseudoLyapunov exponent'',
Mysteries, Puzzles and Paradoxes in Quantum Mechanics, V Edition Workshop,
Palazzo Feltrinelli, Gargnano, Garda Lake, Italy, 15 September 2003;
J. Mod. Opt. Vol. 51 No. 67 (15 April  10May 2004) 1099.
 Yukihiro Ota and Ichiro Ohba,
``Crossover from Classical to Quantum Behavior in Duffing Oscillator
through ``PseudoLyapunov Exponent'''',
Waseda International Symposium on Fundamental Physics:
New Perspectives in Quantum Physics,
Waseda University, Tokyo, Japan, November 14, 2002;
J. Phys. Soc. Jpn. 72, Suppl. C (2003) 119122.

Yukihiro Ota and Ichiro Ohba,
``SemiClassical approach for Dissipative Quantum System'',
YITPW0213
``QUANTUM CHAOS'',
Yukawa Institute for Theoretical Physics, Kyoto University, Japan, September 911, 2002.

Yukihiro Ota and Ichiro Ohba,
``Description of quantum state diffusion by the use of path integrals'',
2002 Autumn Meeting, 6pTA3, Chubu University, Nagoya, Japan, September 2002.
 Yukihiro Ota and Ichiro Ohba,
``Quantumclassical correspondence of Duffing oscillator based on
quantum state diffusion 2'',
The 57th Annual Meeting, 27aXY11, Ritsumeikan University, Kyoto, Japan, March 2002.
 Yukihiro Ota and Ichiro Ohba,
``Crossover from classical to quantum behavior in Duffing Oscillator
based on quantum state diffusion'',
The Second Winter Institute on Fundamental Quantum Theory and Quantum
Optics: Quantum Infomation Processing,
The S N Bose National Center of Basic Science, Kolkata, India, 10. Jan.
2002;
PRAMANAJ. Phys., Vol. 59, No. 2 (August 2002) pp.409412.
 Yukihiro Ota and Ichiro Ohba,
``Quantumclassical correspondence of Duffing oscillator based on
quantum state diffusion'',
2001 Autumn Meeting, 20aRC10, Tokushima Bunri University, Tokushima, Japan, September 2001.
Others
[

]
Links
[
Physical Society 
Journals 
Preprint server 
Research Institute 
Program Library ]
[
Useful Website 
Cygwin 
Useful free soft 
Let's Try!
]
Physical Society
Journals
Preprint server
Research Institute
Program Library
Useful Website
Cygwin
Useful free soft
Let's Try !
Graffiti (?)
The following pages are written by Japanese... (Sorry !).
Created by Yukihiro Ota
Last Update: Aps 16, 2012