Decoherence and Collisional Frequency Shifts of Trapped Bosons and Fermions

Details Decoherence and Collisional Frequency Shifts of Trapped Bosons and Fermions Decoherence and Collisional Frequency Shifts of Trapped Bosons and Fermions

2009-08-21

arxiv.org/abs/0908.3147v2

Phys. Rev. Lett. 103, 113202 (2009)

Physics

Atomic Physics

Final version with corrected and clarified discussion of g2

Scientific paper

10.1103/PhysRevLett.103.113202

We perform exact calculations of collisional frequency shifts for several fermions or bosons using a singlet and triplet basis for pairs of particles. The "factor of 2 controversy" for bosons becomes clear - the factor is always 2. Decoherence is described by singlet states and they are unaffected by spatially uniform clock fields. Spatial variations are critical, especially for fermions which were previously thought to be immune to collision shifts. The spatial variations lead to decoherence and a novel frequency shift that is not proportional to the partial density of internal states.

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