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Quantum optics

Repairing quadrature entanglement

Optical loss degrades quantum correlations, hindering the use of quantum quadrature entanglement for many applications. Researchers have now experimentally demonstrated that this entanglement can be recovered using photon subtraction.

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Figure 1: Distillation of quadrature entanglement by probabilistic photon subtraction.


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Ourjoumtsev, A. Repairing quadrature entanglement. Nature Photon 4, 136–138 (2010).

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