Mesoscopic atomic entanglement for precision measurements beyond the standard quantum limit

Details Mesoscopic atomic entanglement for precision measurements beyond the standard quantum limit Mesoscopic atomic entanglement for precision measurements beyond the standard quantum limit

2008-10-20

arxiv.org/abs/0810.3545v2

PNAS (7/2009) vol. 106 no. 27 10960-10965

Physics

Quantum Physics

6 pages+suppl, PNAS format

Scientific paper

10.1073/pnas.0901550106

Squeezing of quantum fluctuations by means of entanglement is a well recognized goal in the field of quantum information science and precision measurements. In particular, squeezing the fluctuations via entanglement between two-level atoms can improve the precision of sensing, clocks, metrology, and spectroscopy. Here, we demonstrate 3.4 dB of metrologically relevant squeezing and entanglement for ~ 10^5 cold cesium atoms via a quantum nondemolition (QND) measurement on the atom clock levels. We show that there is an optimal degree of decoherence induced by the quantum measurement which maximizes the generated entanglement. A two-color QND scheme used in this paper is shown to have a number of advantages for entanglement generation as compared to a single color QND measurement.

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