Physics – Quantum Physics
Scientific paper
2011-03-02
Phys. Rev. Lett. 106, 133601 (2011)
Physics
Quantum Physics
Letter (4 pages, 4 figures) and Supporting Material (3 pages). To appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.106.133601
We use the vacuum Rabi splitting to perform quantum nondemolition (QND) measurements that prepare a conditionally spin-squeezed state of a collective atomic psuedo-spin. We infer a 3.4(6) dB improvement in quantum phase estimation relative to the standard quantum limit for a coherent spin state composed of uncorrelated atoms. The measured collective spin is composed of the two-level clock states of nearly 10^6 Rb-87 atoms confined inside a low finesse F = 710 optical cavity. This technique may improve atomic sensor precision and/or bandwidth, and may lead to more precise tests of fundamental physics.
Bohnet Justin G.
Chen Zilong
Dai Jiayan
Sankar Shannon R.
Thompson James K.
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