Research Projects
Present
Fundamental Limit to Controlling qubit(s)
Prescription for Integrating Quantm Logics to Quantum Circuits
and the cirtuits to Quantum Turing
Machines
Cost of Information Erasure and Maxwell's Demon Exorcism
Past
Cavity QED
Thermodynamical Limit of Computation



Pubulication List
Y. Yamamoto, S. Machida, Y. Horikoshi, K. Igeta, and G. Björk:
Enhanced and Inhibited Spontaneous Emission of Free Excitons in GaAs Quantum
Wells in a Microcavity,
Opt. Commun. 80, 337342 ( 1991)
G. Björk, S. Machida, Y. Yamamoto, and K. Igeta:
Modification of Spontaneous Emission Rate in Planar Dielectric Microcavity
Structures,
Phys. Rev. A 44, 669681 (July 1991)
K. Igeta and T. Ogawa "Information Dissipation in Quantum Chaotic Systems"
chaos solitionsand Fractals 5 '95 pp.1365 (1995)

International Conferences
K. Igeta and Y. Yamamoto "Quantum Mechanical Computers with single Atom
and Photon Fields "
in Technical Digest of the XVI international Conference on Quantum Electronics,
IQEC'88 pp.310
Y. Yamamoto, M. Kitagawa, and K. Igeta: Quantum Mechanical Aspects of
Optical Communication and Optical Computing, in Proceedings
of the 3rd Asia Pacific Physics Conference, eds. Y. W. Chan, A. F. Leung,
C. N. Yang, and K. Young (World Scientific, New Jersey, 1988), pp. 779799.
Y. Yamamoto, S. Machida, K. Igeta, M. Ueda, and O. Nilsson:
Generation of NumberPhase Squeezed States and Single Photon States by Semiconductor
Lasers,
Winter Colloquium on Quantum Electronics, Snowbird, Utah (January 1989)
Y. Yamamoto, S. Machida K. Watanabe, K. Igeta, M. Ueda, and H. A. Haus:
Generation and Quantum Nondemolition Measurement of NumberPhase Squeezed
States of Light, in Atomic Physics II, eds. S. Haroche, J. C. Gay, and G.
Grynberg (World Scientific, New Jersey, 1989), pp. 483501.
Y. Yamamoto, S. Machida, K. Igeta, and Y. Horikoshi:
Enhanced and Inhibited Spontaneous Emission from GaAs Quantum Wells by
Modified Vacuum Field Fluctuations, 6th Rochester Conference on Coherence
and Quantum Optics, Rochester, New York (June 1989)
K. Igeta, S. Machida, Y. Yamamoto, and Y. Horikoshi:
Enhanced Spontaneous Emission from a GaAs Quantum Well in a Microcavity,
Gordon Research Conference on Nonlinear Optics and Lasers, Wolfeboro, Massachusetts
(July 1989) [Invited]
Y. Yamamoto, S. Machida, W. H. Richardson, K. Igeta, and G. Björk: Squeezing
and Cavity QED in a GaAs Quantum Well Laser, International Quantum Electronics
Conference, Anaheim, California (May 1990)
Y. Yamamoto, S. Machida, K. Igeta, and G. Björk: Microcavity Semiconductor
Laser with Enhanced Spontaneous Emission, European Conference on Optical Communications,
Amsterdam, The Netherlands (September 1990).
Y. Yamamoto, S. Machida, K. Igeta, and G. Björk: Controlled Spontaneous
Emission in Microcavity Semiconductor Lasers, in Coherence, Amplification,
and Quantum Effects in Semiconductor Lasers,
ed. Y. Yamamoto (John Wiley & Sons, Inc., New York, 1991), pp. 561615.
K. Igeta ``Physical Meaning of Compulation " in Proc. of the Workshop
on Physics and Computation, PhysComp '92, (IEEE computer society press,
1992), PP184
K. igeta ``Physical Meaning of Computation"
in Proc. of the International Symposia on Information Sciences(ISKIT'92)
pp.93
K. Igeta and N. Imoto "Decoherence and Error in a TwoState Logic Element"
International Workshop on Quantum Mechanical Computer (QMC '95), 1995
K. Igeta, B.Huttner and N. Imoto, ``Controlling atomic states by optical
plulses"
Technical Digest of the Pacific Rim Conference on Lasers and ElectroOptics,pp.145
(1995)
K. Igeta, B.Huttner and N. Imoto, ``Intrinsic limit of classical and quantum
computational devices"
in Proc. of the Workshop on Physics and Computation, PhysComp '96
N. Imoto, K. Igeta and M. Koashi "Limit of controlling quantum bits by
coherent lights,"
USJapan Seminar on Manipulation of Matter by Coherent Light, Kusatsu,
Sept. 15, 1997.
K. Igeta, N. Imoto and M. Koashi, `` Optical Control of a Qubit under Power
Constraint;
Technical Digest of the Pacific Rim Conference on Lasers and ElectroOptics,pp.1452
(2005)




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Optical Science Laboratory
 Quantum Optical State Control Research Group 


