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1 Quantum Measurements and Quantum Metrology

1 2013

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Requirements for two-source entanglement concentration

100%

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

2013

tom 1

5-11

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.