TY - JOUR
T1 - Control of spin current in a Bose gas by periodic application of π pulses
AU - Eto, Yujiro
AU - Sadgrove, Mark
AU - Hasegawa, Sho
AU - Saito, Hiroki
AU - Hirano, Takuya
PY - 2014/7/28
Y1 - 2014/7/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84905196784&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.90.013626
DO - 10.1103/PhysRevA.90.013626
M3 - Article
AN - SCOPUS:84905196784
SN - 1050-2947
VL - 90
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 1
M1 - 013626
ER -