Physics – Quantum Physics
Scientific paper
2012-01-19
Physics
Quantum Physics
9 pages, 6 figures
Scientific paper
The non-Gaussian operations effected by adding or subtracting a photon on the entangled optical beams emerging from a parametric down-conversion process have been suggested to enhance entanglement. Heralded photon addition or subtraction is, as a matter of fact, at the heart of continuous-variable entanglement distillation. The use of such processes has recently been experimentally demonstrated in the context of the generation of optical coherent-state superpositions or the verification of the canonical commutation relations. Here, we carry out a systematic study of the effect of arbitrary photon addition or subtraction on a two-mode squeezed vacuum state, showing that adding photons typically provides stronger entanglement enhancement than subtracting photons. We also analyze the interplay between entanglement and non-Gaussianity, showing that it is more subtle than previously expected.
Cerf Nicolas J.
Garcia-Patron Raul
Navarrete-Benlloch Carlos
Shapiro Jeffrey H.
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