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Collisional decoherence of superposition states in an ultracold gas near a Feshbach resonance

TitleCollisional decoherence of superposition states in an ultracold gas near a Feshbach resonance
Publication TypeJournal Article
Year of Publication2012
AuthorsCui, J, Krems, RV
JournalPHYSICAL REVIEW A
Volume86
Pagination022703
Date PublishedAUG 2
ISSN1050-2947
Abstract

We present expressions demonstrating that collisional decoherence of ultracold atoms or molecules in a coherent superposition of nondegenerate quantum states is suppressed when both the real and imaginary parts of the scattering lengths for the states in the coherent superposition are equal. We show that the rate of collisional decoherence can be enhanced or suppressed by varying an external magnetic field near a Feshbach resonance. For some resonances, the suppression is very dramatic. We propose a method for measuring the scattering length of ultracold particles in excited quantum states exhibiting Feshbach resonances.

DOI10.1103/PhysRevA.86.022703