Decoherence and entanglement in twomode squeezed vacuum states
Abstract
I investigate the decoherence of twomode squeezed vacuum states by analyzing the relative entropy of entanglement. I consider two sources of decoherence: (i) the phase damping and (ii) the amplitude damping due to the coupling to the thermal environment. In particular, I give the exact value of the relative entropy of entanglement for the phase damping model. For the amplitude damping model, I give an upper bound for the relative entropy of entanglement, which turns out to be a good approximation for the entanglement measure in the usual experimental situations.
 Publication:

Physical Review A
 Pub Date:
 February 2001
 DOI:
 10.1103/PhysRevA.63.022305
 arXiv:
 arXiv:quantph/0006100
 Bibcode:
 2001PhRvA..63b2305H
 Keywords:

 03.67.a;
 03.65.Ta;
 42.50.Dv;
 Quantum information;
 Foundations of quantum mechanics;
 measurement theory;
 Nonclassical states of the electromagnetic field including entangled photon states;
 quantum state engineering and measurements;
 Quantum Physics
 EPrint:
 5 pages, RevTex, 3 eps figures