48 citations · 169 across the 11 of their papers we have counts for
11 papers
Dispersive measurement of spin shot noise in a Bose--Einstein condensate
Kosuke Shibata, Naota Sekiguchi, Junnosuke Takai +1
We report dispersive spin shot noise measurement of a Bose--Einstein condensate (BEC). While dispersive probing has been used for quantum spin noise measurement of thermal and cold…
Multi-state interferometric measurement of nonlinear AC Stark shift
Junnosuke Takai, Kosuke Shibata, Naota Sekiguchi +1
We demonstrate measurement of quadratic AC Stark shifts between Zeeman sublevels in an Rb Bose--Einstein condensate using a multi-state atomic interferometer. The interferom…
Quantum lock-in detection of a vector light shift
Kosuke Shibata, Naota Sekiguchi, Takuya Hirano
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 magne…
Sensitive BEC magnetometry with optimized probing
Naota Sekiguchi, Aki Torii, Hiroyuki Toda +4
An improved spatial magnetometer using a spinor Bose-Einstein condensate of Rb atoms is realized utilizing newly developed two-polarization phase contrast imaging. The optic…
Compensation of gravity on cold atoms by a linear optical potential
Kosuke Shibata, Hidehiko Ikeda, Ryota Suzuki +1
We demonstrate gravity compensation for an ultracold gas of Rb atoms with a time-averaged optical potential. The position of a far-off-resonance beam is temporally modulated…
Faraday patterns generated by Rabi oscillation in a binary Bose-Einstein condensate
Terun Chen, Kosuke Shibata, Yujiro Eto +2
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 interact…
Interaction modulation in a long-lived Bose-Einstein condensate by rf coupling
Kosuke Shibata, Aki Torii, Hitoshi Shibayama +3
We demonstrate modulation of the effective interaction between the magnetic sublevels of the hyperfine spin in a Rb Bose-Einstein condensate by Rabi coupling with radi…
Dissipation-assisted coherence formation in a spinor quantum gas
Yujiro Eto, Hitoshi Shibayama, Kosuke Shibata +4
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 d…
Loading of atoms into an optical trap with high initial phase-space density
Kosuke Shibata, Shota Yonekawa, Satoshi Tojo
We report a method for loading cold atoms into an optical trap with high initial phase-space density (PSD). When the trap beam is overlapped with atoms in optical molasses of optim…
Resonant Control of Interaction Between Different Electronic States
Shinya Kato, Seiji Sugawa, Kosuke Shibata +2
We observe a magnetic Feshbach resonance in a collision between the ground and metastable states of two-electron atoms of ytterbium (Yb). We measure the on-site interaction of doub…
A scalable quantum computer with an ultranarrow optical transition of ultracold neutral atoms in an optical lattice
K. Shibata, S. Kato, A. Yamaguchi +2
We propose a new quantum-computing scheme using ultracold neutral ytterbium atoms in an optical lattice. The nuclear Zeeman sublevels define a qubit. This choice avoids the natural…