A revised dissertation reports atom-photon entanglement between a single optically trapped 87Rb atom and a spontaneously emitted photon with fidelity 0.82.
Photon polarisation entanglement from distant dipole sources
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abstract
It is commonly believed that photon polarisation entanglement can only be obtained via pair creation within the same source or via postselective measurements on photons that overlapped within their coherence time inside a linear optics setup. In contrast to this, we show here that polarisation entanglement can also be produced by distant single photon sources in free space and without the photons ever having to meet, if the detection of a photon does not reveal its origin -- the which way information. In the case of two sources, the entanglement arises under the condition of two emissions in certain spatial directions and leaves the dipoles in a maximally entangled state.
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Quantum optical experiments towards atom-photon entanglement
A revised dissertation reports atom-photon entanglement between a single optically trapped 87Rb atom and a spontaneously emitted photon with fidelity 0.82.