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Requirements for two-source entanglement concentration

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Vidrighin M., Bartley T. J., Donati G., Jin X.-M., Barbieri M., Kolthammer W. S., Datta A., Walmsley I. A.
Quantum Measurements and Quantum Metrology
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2013
|
vol. 1
5-11
EN
Entanglement enhancement is a key task for quantum technologies. This operation performed on states produced by parametric down-conversion sources has been the object of several recent experimental investigations. In particular, conditional preparation by photon-subtraction has been shown to improve the entanglement of these states. Here we analyse the role played by non-Gaussian and Gaussian measurements in more general entanglement concentration operations performed on a pair of two-mode squeezed vacua. We find stringent requirements for achieving an improved entanglement enhancement by measuring jointly these two resource states.
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