De-Gaussification by inconclusive photon subtraction
S. Olivares, M. G. A. Paris · Laser Physics · 2006
We address conditional de-Gaussiflcation of continuous variable states by inconclusive photon subtraction (IPS) and review in detail its application to the bipartite twin-beam state of radiation. The IPS map in the Fock basis and counterpart in the phase space have been derived. Teleportation assisted by IPS states is analyzed, and the corresponding fidelity is evaluated as a function of the involved parameters. Nonlocality of IPS states is investigated by means of different tests, including displaced parity, homodyne detection, pseudospin, and displaced on/off photodetection. Dissipation and thermal noise and nonunit quantum efficiency are taken into account in the detection stage. We show that the IPS process, for a suitable choice of the involved parameters, improves teleportation fidelity and enhances nonlocal properties.