Noise Robustness of the Nonlocality of Entangled Quantum States
Abstract
We study the nonlocal properties of states resulting from the mixture of an arbitrary entangled state ρ of two ddimensional systems and completely depolarized noise, with respective weights p and 1p. We first construct a local model for the case in which ρ is maximally entangled and p at or below a certain bound. We then extend the model to arbitrary ρ. Our results provide bounds on the resistance to noise of the nonlocal correlations of entangled states. For projective measurements, the critical value of the noise parameter p for which the state becomes local is at least asymptotically log(d) larger than the critical value for separability.
 Publication:

Physical Review Letters
 Pub Date:
 July 2007
 DOI:
 10.1103/PhysRevLett.99.040403
 arXiv:
 arXiv:quantph/0703018
 Bibcode:
 2007PhRvL..99d0403A
 Keywords:

 03.65.Ud;
 03.67.Mn;
 Entanglement and quantum nonlocality;
 Entanglement production characterization and manipulation;
 Quantum Physics
 EPrint:
 5 pages, no figures. The last page only contains a few references