Increasing entanglement between Gaussian states by coherent photon subtraction

Details Increasing entanglement between Gaussian states by coherent photon subtraction Increasing entanglement between Gaussian states by coherent photon subtraction

2006-08-29

arxiv.org/abs/quant-ph/0608230v4

Physical review letters 98 (2007) 030502

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevLett.98.030502

We experimentally demonstrate that the entanglement between Gaussian entangled states can be increased by non-Gaussian operations. Coherent subtraction of single photons from Gaussian quadrature-entangled light pulses, created by a non-degenerate parametric amplifier, produces delocalized states with negative Wigner functions and complex structures, more entangled than the initial states in terms of negativity. The experimental results are in very good agreement with the theoretical predictions.

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