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Paper detail

Loophole-free Bell test for one atom and less than one photon

We consider the entanglement between two internal states of a single atom and two photon number states describing either the vaccum or a single photon and thus containing, on average, less than one photon. We show that this intriguing entanglement can be characterized through substantial violations of a Bell inequality by performing homodyne detections on the optical mode. We present the experimental challenges that need to be overcome to pave the way towards a loophole-free Bell test in this setup.

preprint2011arXivOpen access
N. SangouardJ. -D. BancalN. GisinW. RosenfeldP. SekatskiM. WeberH. Weinfurter
quant-ph
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N. SangouardJ. -D. BancalN. GisinW. RosenfeldP. SekatskiM. WeberH. Weinfurter

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