Zobrazeno 1 - 10
of 108
pro vyhledávání: '"Kobayashi, Kohei"'
Autor:
Kobayashi, Kohei
Control of open quantum dynamics is of great interest for realizing quantum technologies. Therefore, it is an important task to quantify and characterize the entropy for open quantum systems under decoherence. In this paper, we study the time evoluti
Externí odkaz:
http://arxiv.org/abs/2405.11824
Autor:
Kobayashi, Kohei
We investigate the effect of analog control errors which deterministically occurs on isolated quantum dynamics. Quantum information technologies require careful control for preparing a desired quantum state used as an information resource. However, i
Externí odkaz:
http://arxiv.org/abs/2403.06116
Autor:
Kobayashi, Kohei
To implement quantum information technologies, carefully designed control for preparing a desired state plays a key role. However, in realistic situation, the actual performance of those methodologies is severely limited by decoherence. Therefore, it
Externí odkaz:
http://arxiv.org/abs/2303.06466
Autor:
Williams, Maia A., Kennea, Jamie A., Dichiara, S., Kobayashi, Kohei, Iwakiri, Wataru B., Beardmore, Andrew P., Evans, P. A., Heinz, Sebastian, Lien, Amy, Oates, S. R., Negoro, Hitoshi, Cenko, S. Bradley, Buisson, Douglas J. K., Hartmann, Dieter H., Jaisawal, Gaurava K., Kuin, N. P. M., Lesage, Stephen, Page, Kim L., Parsotan, Tyler, Pasham, Dheeraj R., Sbarufatti, B., Siegel, Michael H., Sugita, Satoshi, Younes, George, Ambrosi, Elena, Arzoumanian, Zaven, Bernardini, M. G., Campana, S., Capalbi, Milvia, Caputo, Regina, D'Ai, Antonino, D'Avanzo, P., D'Elia, V., De Pasquale, Massimiliano, Eyles-Ferris, R. A. J., Ferrara, Elizabeth, Gendreau, Keith C., Gropp, Jeffrey D., Kawai, Nobuyuki, Klingler, Noel, Laha, Sibasish, Melandri, A., Mihara, Tatehiro, Moss, Michael, O'Brien, Paul, Osborne, Julian P., Palmer, David M., Perri, Matteo, Serino, Motoko, Sonbas, E., Stamatikos, Michael, Starling, Rhaana, Tagliaferri, G., Tohuvavohu, Aaron, Zane, Silvia, Ziaeepour, Houri
We report the discovery of the unusually bright long-duration gamma-ray burst (GRB), GRB 221009A, as observed by the Neil Gehrels Swift Observatory (Swift), Monitor of All-sky X-ray Image (MAXI), and Neutron Star Interior Composition Explorer Mission
Externí odkaz:
http://arxiv.org/abs/2302.03642
Autor:
Kobayashi, Kohei
We investigate the effect of stochastic control errors on the Hamiltonian that controls a closed quantum system. Quantum information technologies require careful control for preparing a desired state used as an information resource. However, because
Externí odkaz:
http://arxiv.org/abs/2211.14862
Discovery of a new supergiant fast X-ray transient MAXI J0709-159 associated with the Be star LY CMa
Autor:
Sugizaki, Mutsumi, Mihara, Tatehiro, Kobayashi, Kohei, Negoro, Hitoshi, Shidatsu, Megumi, Pike, Sean N., Iwakiri, Wataru, Urabe, Sota, Serino, Motoko, Kawai, Nobuyuki, Nakajima, Motoki, Kennea, Jamie A., Liu, Zhu
We report on the discovery of a new supergiant fast X-ray transient (SFXT), MAXI J0709$-$159, and its identification with LY CMa (also known as HD 54786). On 2022 January 25, a new flaring X-ray object named MAXI J0709$-$159, was detected by Monitor
Externí odkaz:
http://arxiv.org/abs/2207.01969
Autor:
Shidatsu, Megumi, Kobayashi, Kohei, Negoro, Hitoshi, Iwakiri, Wataru, Nakahira, Satoshi, Ueda, Yoshihiro, Mihara, Tatehiro, Enoto, Teruaki, Gendreau, Keith, Arzoumanian, Zaven, Pope, John, Trout, Bruce, Okajima, Takashi, Soong, Yang
We report the results from the broad-band X-ray monitoring of the new Galactic black hole candidate MAXI J1803$-$298 with the MAXI/GSC and Swift/BAT during its outburst. After the discovery on 2021 May 1, the soft X-ray flux below 10 keV rapidly incr
Externí odkaz:
http://arxiv.org/abs/2202.01401
Autor:
Kobayashi, Kohei
In recent years, Arenz et al. proposed the idea of reachable set characterization based on the quantum speed limit (QSL); that is, the reachable set of the target unitary gate in a closed qubit system can be characterized by considering the QSL as th
Externí odkaz:
http://arxiv.org/abs/2111.03633
Autor:
Kobayashi, Kohei, Yamamoto, Naoki
Publikováno v:
Phys. Rev. A 102, 042606 (2020)
In this paper, we propose a concept to use a quantum speed limit (QSL) as a measure of robustness of states, defining that a state with bigger QSL is more robust. In this perspective, it is important to have an explicitly-computable QSL, because then
Externí odkaz:
http://arxiv.org/abs/2007.02788
Autor:
Kobayashi, Kohei, Yamamoto, Naoki
Publikováno v:
Physical Review A 99, 052347 (2019)
Quantum information technologies require careful control for generating and preserving a desired target quantum state. The biggest practical obstacle is, of course, decoherence. Therefore, the reachability analysis, which in our scenario aims to esti
Externí odkaz:
http://arxiv.org/abs/1905.12250