Zobrazeno 1 - 10
of 152
pro vyhledávání: '"Hirano, Takuya"'
We demonstrate measurement of quadratic AC Stark shifts between Zeeman sublevels in an $^{87}$Rb Bose--Einstein condensate using a multi-state atomic interferometer. The interferometer can detect a quadratic shift without being affected by relatively
Externí odkaz:
http://arxiv.org/abs/2206.05465
Publikováno v:
Phys. Rev. A 103, 043335 (2021)
We demonstrate detection of a vector light shift (VLS) using the quantum lock-in method. The method offers precise and accurate VLS measurement without being affected by real magnetic field fluctuations. We detect a VLS on a Bose--Einstein condensate
Externí odkaz:
http://arxiv.org/abs/2101.09102
Autor:
Sekiguchi, Naota, Torii, Aki, Toda, Hiroyuki, Kuramoto, Ryohei, Fukuda, Daiki, Hirano, Takuya, Shibata, Kosuke
An improved spatial magnetometer using a spinor Bose-Einstein condensate of $^{87}$Rb atoms is realized utilizing newly developed two-polarization phase contrast imaging. The optical shot noise is suppressed by carefully choosing the probe parameters
Externí odkaz:
http://arxiv.org/abs/2009.07569
Publikováno v:
Phys. Rev. Research 2, 013068 (2020)
We demonstrate gravity compensation for an ultracold gas of $^{87}$Rb atoms with a time-averaged optical potential. The position of a far-off-resonance beam is temporally modulated with an acousto-optic deflector to efficiently produce a potential wi
Externí odkaz:
http://arxiv.org/abs/1907.13497
Publikováno v:
Phys. Rev. A 100, 063610 (2019)
The interaction between atoms in a two-component Bose-Einstein condensate (BEC) is effectively modulated by the Rabi oscillation. This periodic modulation of the effective interaction is shown to generate Faraday patterns through parametric resonance
Externí odkaz:
http://arxiv.org/abs/1907.03945
Publikováno v:
Phys. Rev. A 99, 013622 (2019)
We demonstrate modulation of the effective interaction between the magnetic sublevels of the hyperfine spin $F=1$ in a $^{87}$Rb Bose-Einstein condensate by Rabi coupling with radio-frequency (rf) field. The use of the $F=1$ manifold enables us to ob
Externí odkaz:
http://arxiv.org/abs/1812.01284
Publikováno v:
Phys. Rev. A 98, 042319 (2018)
We have developed a method to calculate a secret key rate of a continuous-variable quantum-key-distribution scheme using four coherent states and postselection for a general model of Gaussian attacks. We assume that the transmission line and detectio
Externí odkaz:
http://arxiv.org/abs/1810.11457
Autor:
Eriksson, Tobias A., Hirano, Takuya, Ono, Motoharu, Fujiwara, Mikio, Namiki, Ryo, Yoshino, Ken-ichiro, Tajima, Akio, Takeoka, Masahiro, Sasaki, Masahide
We study coexistence of CV-QKD and 7 classical 12.5 Gbit/s on-off keying channels in WDM transmission over the C-band. We demonstrate key generation with a distilled secret key rate between 20 to 50 kbit/s in experiments running continuously over 24
Externí odkaz:
http://arxiv.org/abs/1809.01287
Autor:
Eto, Yujiro, Shibayama, Hitoshi, Shibata, Kosuke, Torii, Aki, Nabeta, Keita, Saito, Hiroki, Hirano, Takuya
Publikováno v:
Phys. Rev. Lett. 122, 245301 (2019)
Dissipation affects all real-world physical systems and often induces energy or particle loss, limiting the efficiency of processes. Dissipation can also lead to the formation of dissipative structures or induce quantum decoherence. Quantum decoheren
Externí odkaz:
http://arxiv.org/abs/1809.00768
Publikováno v:
Phys. Rev. A 97, 023622 (2018)
We investigate the ground-state phases of a mixture of spin-1 and spin-2 Bose-Einstein condensates at zero magnetic field. In addition to the intra-spin interactions, two spin-dependent interaction coefficients are introduced to describe the inter-sp
Externí odkaz:
http://arxiv.org/abs/1712.05111