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

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

Author: ** Koji Usami, Mikio Kozuma**

Source: https://arxiv.org/