Entanglement concentration with quantum nondemolition Hamiltonians
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We devise and examine two procrustean entanglement concentration schemes using quantum nondemolition (QND) interaction Hamiltonians in the continuous variable regime, applicable for light, for atomic ensembles or in a hybrid setting. We thus expand the standard entanglement distillation toolbox for use of a much more general, versatile, and experimentally feasible interaction class. The first protocol uses Gaussian ancillary modes and a non-Gaussian postmeasurement, the second a non-Gaussian ancillary mode and a Gaussian postmeasurement. We explicitly calculate the density matrix elements of the non-Gaussian mixed states resulting from these protocols using an elegant Wigner-function-based method in a numerically efficient manner. We then quantify the entanglement increase calculating the logarithmic negativity of the output state and discuss and compare the performance of the protocols.
Tatham , R & Korolkova , N 2014 , ' Entanglement concentration with quantum nondemolition Hamiltonians ' , Physical Review. A, Atomic, molecular, and optical physics , vol. 89 , no. 1 , 012308 . https://doi.org/10.1103/PhysRevA.89.012308
Physical Review. A, Atomic, molecular, and optical physics
DescriptionWe also acknowledge an EU grant under the FET-Open project COMPAS (No. 212008) and are grateful for the support of the Scottish Universities Physics Alliance (SUPA).
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