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

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

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number013626
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume90
Issue number1
DOIs
Publication statusPublished - 2014 Jul 28

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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