Ramsey-like measurement of the decoherence rate between Zeeman sub-levels

Details Ramsey-like measurement of the decoherence rate between Zeeman sub-levels Ramsey-like measurement of the decoherence rate between Zeeman sub-levels

2008-07-19

arxiv.org/abs/0807.3110v1

Phys. Rev. A 78, 063818 (2008)

Physics

Quantum Physics

7 pages, 7 figures

Scientific paper

10.1103/PhysRevA.78.063818

Two-photon processes that involve different sub-levels of the ground state of an atom, are highly sensitive to depopulation and decoherence within the ground state. For example, the spectral width of electromagnetically induced transparency resonances in $\Lambda-$type system, are strongly affected by the ground state depopulation and decoherence rates. We present a direct measurement of decay rates between hyperfine and Zeeman sub-levels in the ground state of $^{87}$Rb vapor. Similar to the relaxation-in-the-dark technique, pumping lasers are used to pre-align the atomic vapor in a well defined quantum state. The free propagation of the atomic state is monitored using a Ramsey-like method. Coherence times in the range 1-10 ms were measured for room temperature atomic vapor. In the range of the experimental parameters used in this study, the dominant process inducing Zeeman decoherence is the spin-exchange collisions between rubidium atoms.

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