Observation of Topological and Parity-dependent Phase of $m=0$ Spin States

Details Observation of Topological and Parity-dependent Phase of $m=0$ Spin States Observation of Topological and Parity-dependent Phase of $m=0$ Spin States

2007-05-22

arxiv.org/abs/0705.3155v2

Phys. Rev. Lett. 99, 140404 (2007)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.140404

A Ramsey interrogation scheme was used to measure the phase shift of laser-cooled $^{87}$Rb clock-transition pseudospins arising as a result of a reversal of a bias magnetic field, i.e., $\textbf{B} \to -\textbf{B}$, during the interrogation. While no phase shift occurred when the reversal was sudden, the Ramsey fringes were shifted by a factor of $\pi$ when the reversal was adiabatic. We thus verified the prediction that the spin states $|F,m=0 >$ acquire a purely topological and parity-dependent phase factor of $(-1)^{F}$ as a result of $\textbf{B} \to -\textbf{B}$.

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