Cs钟跃迁赝自旋的连续非破坏测量
A Continuous Non-demolition Measurement of the Cs Clock Transition Pseudo-spin
摘要：
我们证明了一个弱的连续测量的赝自旋与时钟跃迁的样品中的Cs原子。我们的方案使用了一个光学探针附近的D1过渡调谐来测量样品的双折射，这取决于集体赝自旋的z分量。在某些探测频率下，时钟状态的差分光移消失，测量是非扰动的。在稠密样品中，这种测量可以用来压缩集体钟的赝自旋，并有可能提高原子钟和干涉仪的性能。
英文摘要：
We demonstrate a weak continuous measurement of the pseudo-spin associated with the clock transition in a sample of Cs atoms. Our scheme uses an optical probe tuned near the D1 transition to measure the sample birefringence, which depends on the z-component of the collective pseudospin. At certain probe frequencies the differential light shift of the clock states vanishes and the measurement is non-perturbing. In dense samples the measurement can be used to squeeze the collective clock pseudo-spin, and has potential to improve the performance of atomic clocks and interferometers.
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