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

ABSTRACT: 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 2-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 greater, similar 10(5) cold caesium 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 2-color QND scheme used in this paper is shown to have a number of advantages for entanglement generation as compared with a single-color QND measurement.

SUBMITTER: Appel J

PROVIDER: S-EPMC2708678 | biostudies-literature | 2009 Jul

REPOSITORIES: biostudies-literature

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

Appel J J Windpassinger P J PJ Oblak D D Hoff U B UB Kjaergaard N N Polzik E S ES

Proceedings of the National Academy of Sciences of the United States of America 20090617 27

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 2-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 greater, similar 10(5) cold caesium atoms via a quantum nondemolition (QND) measurement on the atom c ...[more]

PMID: 19541646

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