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Three-Photon Correlations in a Strongly Driven Atom-Cavity System

Wed, 2011-10-05 14:22 - Donatella Rosetti
Date: 
2011-07-06
Author(s): 

M. Koch, C. Sames, M. Balbach, H. Chibani, A. Kubanek, K. Murr, T. Wilk, G. Rempe

Reference: 

Physical Review Letters 107, 023601 (2011)

The quantum dynamics of a strongly driven, strongly coupled single-atom-cavity system is studied by evaluating time-dependent second- and third-order correlations of the emitted photons. The coherent energy exchange, first, between the atom and the cavity mode, and second, between the atom-cavity system and the driving laser, is observed. Three-photon detections show an asymmetry in time, a consequence of the breakdown of detailed balance. The results are in good agreement with theory and are a first step towards the control of a quantum trajectory at larger driving strength.

Remote Entanglement between a Single Atom and a Bose-Einstein Condensate

Wed, 2011-10-05 14:16 - Donatella Rosetti
Date: 
2011-05-26
Author(s): 

M. Lettner, M. Mücke, S. Riedl, C. Vo, C. Hahn, S. Baur, J. Bochmann, S. Ritter, S. Dürr, G. Rempe

Reference: 

Physical Review Letters 106, 210503 (2011)
doi: 10.1103/PhysRevLett.106.210503

Entanglement between stationary systems at remote locations is a key resource for quantum networks. We report on the experimental generation of remote entanglement between a single atom inside an optical cavity and a Bose-Einstein condensate (BEC). To produce this, a single photon is created in the atom-cavity system, thereby generating atom-photon entanglement. The photon is transported to the BEC and converted into a collective excitation in the BEC, thus establishing matter-matter entanglement. After a variable delay, this entanglement is converted into photon-photon entanglement.

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