Zobrazeno 1 - 10
of 232
pro vyhledávání: '"Akihisa Tomita"'
Publikováno v:
IEEE Transactions on Quantum Engineering, Vol 4, Pp 1-8 (2023)
Measurement-device-independent quantum key distribution (MDI-QKD) protects legitimate users from attacks on measurement devices. The decoy method allows for unconditionally secure quantum key generation using lasers. One of the most important issues
Externí odkaz:
https://doaj.org/article/6de04a5f78684c64a0b3b269bcbed954
Publikováno v:
Physical Review Research, Vol 3, Iss 3, p 033077 (2021)
The variance of an observable in a preselected quantum system, which is always real and non-negative, appears as an increase in the probe wave packet width in indirect measurements. Extending this framework to pre- and postselected systems, we formul
Externí odkaz:
https://doaj.org/article/1512c411353042d3ab0265dd0a506107
Publikováno v:
New Journal of Physics, Vol 21, Iss 4, p 043013 (2019)
Weak values are typically obtained experimentally by performing weak measurements, which involve weak interactions between the measured system and a probe. However, the determination of weak values does not necessarily require weak measurements, and
Externí odkaz:
https://doaj.org/article/0d6a37f126d343b6a34a815d4f6ff0a4
Publikováno v:
Physical Review X, Vol 8, Iss 2, p 021054 (2018)
To implement fault-tolerant quantum computation with continuous variables, the Gottesman-Kitaev-Preskill (GKP) qubit has been recognized as an important technological element. However, it is still challenging to experimentally generate the GKP qubit
Externí odkaz:
https://doaj.org/article/785263511ded47fcbdbbad1e27318fcf
Publikováno v:
Optical Review. 30:217-231
Almost all novel observable phenomena in quantum optics are related to the quantum coherence. The coherence here is determined by the relative phase inside a state. Unfortunately, so far all the relevant experimental results in quantum optics are ins
Externí odkaz:
http://arxiv.org/abs/quant-ph/0203031
Publikováno v:
Phys. Rev. Lett., 87, 137903(2001)
The partial transposition(PT) operation is an effecient tool in detecting the inseparability of a mixed state. We give an explicit formula for the PT operation for the continuous variable states in Fock space. We then give the necessary and sufficien
Externí odkaz:
http://arxiv.org/abs/quant-ph/0103170
Autor:
Taijun Shiba, Atsushi Okamoto, Naoya Wada, Satoshi Shinada, Shuanglu Zhang, Taketoshi Takahata, Akihisa Tomita, Kazuhisa Ogawa, Hotaka Hayashi, Yuta Goto
Publikováno v:
Optical Review. 28:181-189
In mode-division multiplexing systems, the transmission quality is restricted by the differential mode delay (DMD). We previously proposed a spatial mode exchange technique using volume holograms (VHET) to reduce the DMD. VHET can be used for the exc
Publikováno v:
Optics express. 28(9):13965-13977
Security certification of quantum key distribution systems with a practical device is essential for their social deployment. Considering the transmitter, we investigate quantum state generation affected by degraded electrical signals from practical b
Autor:
Atsushi Okamoto, Daiki Soma, Shuanglu Zhang, Takehiro Tsuritani, Akihisa Tomita, Yuta Abe, Ryo Watanabe, Yuta Wakayama
Publikováno v:
Optics express. 29(24)
To realize simplified cost-efficient optical networks with routing flexibility and scaling potential, a spatial-light-modulator-based optical-fiber joint switch for few-mode multicore fibers is proposed herein, which can route all spatial channels to