Quantum noise squeezing and entanglement on the atomic clock transition
نویسندگان
چکیده
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 atom clocks and of spectroscopy in general [1, 2]. Here, we demonstrate 3.4 dB of metrologically relevant squeezing and entanglement for 10 cold caesium atoms via a quantum nondemolition (QND) measurement [3, 4, 5] on the atom clock levels. We demonstrate the effect of decoherence inherent to generation of entanglement via a QND measurement and present a dichromatic QND scheme which allows to minimize the effect of this decoherence in metrological applications. The spin squeezing method demonstrated here on the microwave caesium clock transition is potentially applicable to optical lattice atom clocks.
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