Zobrazeno 1 - 10
of 102
pro vyhledávání: '"Yamamoto, Katsuji"'
Autor:
Kawakubo, Toru, Yamamoto, Katsuji
We investigate interference of optical fields by examining the probability distribution of photon detection. The usual description of interference patterns in terms of superposition of classical mean fields with definite phases is elucidated in quant
Externí odkaz:
http://arxiv.org/abs/1401.0436
Autor:
Kawakubo, Toru, Yamamoto, Katsuji
We elucidate generally the interference of independent Bose fields in view of the conditional probability for the particle number measurements, and clarify its relation to the source number statistics. Despite lack of intrinsic phases, the interferen
Externí odkaz:
http://arxiv.org/abs/1111.1035
Publikováno v:
Phys. Rev. A 83, 050303(R) (2011)
We propose a robust and scalable scheme to generate an $N$-qubit $W$ state among separated quantum nodes (cavity-QED systems) by using linear optics and postselections. The present scheme inherits the robustness of the Barrett-Kok scheme [Phys. Rev.
Externí odkaz:
http://arxiv.org/abs/1102.4682
Autor:
Kawakubo, Toru, Yamamoto, Katsuji
Publikováno v:
Phys. Rev. A 83, 013819 (2011)
We investigate the dynamical Casimir effect and its detection with Rydberg atoms. The photons are created in a resonant cavity with a plasma mirror of a semiconductor slab which is irradiated by periodic laser pulses. The canonical Hamiltonian is der
Externí odkaz:
http://arxiv.org/abs/1011.2277
Autor:
Fujii, Keisuke, Yamamoto, Katsuji
Publikováno v:
Phys. Rev. A 82, 060301(R) (2010)
We present a scheme to improve the noise threshold for the fault-tolerant topological one-way computation with a constant overhead. Certain cluster states of finite size, say star clusters, are constructed with logical qubits through an efficient ver
Externí odkaz:
http://arxiv.org/abs/1008.2048
Autor:
Kawakubo, Toru, Yamamoto, Katsuji
Publikováno v:
Phys. Rev. A 82, 032102 (2010)
Optical homodyne detection is examined in view of joint probability distribution. It is usually discussed that the relative phase between independent laser fields are localized by photon-number measurements in interference experiments such as homodyn
Externí odkaz:
http://arxiv.org/abs/1007.1596
Autor:
Fujii, Keisuke, Yamamoto, Katsuji
Publikováno v:
Phys. Rev. A 82, 042109 (2010)
We demonstrate that repeated measurements in disordered systems can induce quantum anti-Zeno effect under certain condition to enhance quantum transport. The enhancement of energy transfer is really exhibited with a simple model under repeated measur
Externí odkaz:
http://arxiv.org/abs/1003.1804
Autor:
Fujii, Keisuke, Yamamoto, Katsuji
Publikováno v:
Phys. Rev. A 81, 042324 (2010)
We present a detailed description of an architecture for fault-tolerant quantum computation, which is based on the cluster model of encoded qubits. In this cluster-based architecture, concatenated computation is implemented in a quite different way f
Externí odkaz:
http://arxiv.org/abs/0912.5150
Autor:
Higuchi, Katsuichi, Yamamoto, Katsuji
Publikováno v:
Phys.Rev.D81:015009,2010
We investigate the flavor-changing interactions in an extension of the standard model with singlet quarks and singlet Higgs, which are induced by the mixing between the ordinary quarks and the singlet quarks ($ q $-$ Q $ mixing). We consider the effe
Externí odkaz:
http://arxiv.org/abs/0911.1175
Autor:
Fujii, Keisuke, Yamamoto, Katsuji
Publikováno v:
Phys. Rev. A 80 042308 (2009)
We investigate efficient entanglement purification through double selection process. This method works with higher noise thresholds for the communication channels and local operations, and achieves higher fidelity of purified states. Furthermore it p
Externí odkaz:
http://arxiv.org/abs/0811.2639