CQuIC Seminars
Entanglement of 3000 atoms by one photon
Presented by Vladan Vuletic, MIT
Quantum-mechanically correlated (entangled) states of many particles are of interest in quantum information, quantum computing and quantum metrology. Metrologically useful entangled states of large atomic ensembles (spin squeezed states) have been experimentally realized, but these states display Gaussian spin distribution functions with a non-negative Wigner quasiprobability distribution function. Non-Gaussian entangled states have very recently been produced and characterized in atomic ensembles. Here we generate entanglement in a large atomic ensemble via an interaction with a very weak laser pulse; remarkably, the detection of a single photon prepares several thousand atoms in an entangled state. We reconstruct a negative-valued Wigner function, and verify an entanglement depth (the minimum number of mutually entangled atoms) of 2,900 out of 3,100 atoms. Furthermore we discuss how for an ensemble inside an optical resonator with very strong atom-cavity cou pling almost any symmetric entangled many-atom state can be generated by the detection of one photon.
3:30 pm, Thursday, April 7, 2016
PAIS-2540, PAIS
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