Physics – Quantum Physics
Scientific paper
2002-09-25
Phys. Rev. A vol 67, 032314 (2003)
Physics
Quantum Physics
slightly revised version, to appear in PRA
Scientific paper
10.1103/PhysRevA.67.032314
Inconclusive photon subtraction (IPS) is a conditional measurement scheme to force nonlinear evolution of a given state. In IPS the input state is mixed with the vacuum in a beam splitter and then the reflected beam is revealed by ON/OFF photodetection. When the detector clicks we have the (inconclusive) photon subtracted state. We show that IPS on both channels of an entangled twin-beam of radiation improves the fidelity of coherent state teleportation if the energy of the incoming twin-beam is below a certain threshold, which depends on the beam splitter transmissivity and the quantum efficiency of photodetectors. We show that the energy threshold diverges when the transmissivity and the efficiency approach unit and compare our results with that of previous works on {\em conclusive} photon subtraction.
Bonifacio Rodolfo
Olivares Stefano
Paris Matteo G. A.
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