Control of spin current in a Bose gas by periodic application of π pulses

Yujiro Eto, Mark Sadgrove, Sho Hasegawa, Hiroki Saito, Takuya Hirano

研究成果: Article査読

8 被引用数 (Scopus)


We generate spin currents in an Rb87 spin-2 Bose-Einstein condensate by application of a magnetic field gradient. The spin current destroys the spin polarization, leading to a sudden onset of two-body collisions. In addition, the spin coherence, as measured by the fringe contrast using Ramsey interferometry, is reduced drastically but experiences a weak revival due to in-trap oscillations. The spin current can be controlled using periodic π pulses (bang-bang control), producing longer spin-coherence times. Our results show that spin coherence can be maintained even in the presence of spin currents, with applications to quantum sensing in noisy environments.

ジャーナルPhysical Review A - Atomic, Molecular, and Optical Physics
出版ステータスPublished - 2014 7 28

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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