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Decoherence of a measure of entanglement Denis Tolkunov* and Vladimir Privman
 

Summary: Decoherence of a measure of entanglement
Denis Tolkunov* and Vladimir Privman
Center for Quantum Device Technology, Department of Physics, Clarkson University, Potsdam, New York 136995721, USA
P. K. Aravind
Department of Physics, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts 01609-2280, USA
Received 17 December 2004; published 23 June 2005
For a solvable pure-decoherence model, we confirm by an explicit model calculation that the decay of
entanglement of two two-state systems two qubits is approximately governed by the product of the suppres-
sion factors describing decoherence of the subsystems, provided that they are subject to uncorrelated sources of
quantum noise. This demonstrates an important physical property that separated open quantum systems can
evolve quantum mechanically on time scales larger than the times for which they remain entangled.
DOI: 10.1103/PhysRevA.71.060308 PACS number s : 03.67.Mn, 03.65.Yz, 03.65.Ud
Entanglement of quantum-mechanical states, referring to
the nonlocal quantum correlations between subsystems, is
one of the key resources in the field of quantum information
science. Many protocols in quantum communication and
quantum computation are based on entangled states 1 .
When one considers practical applications of entanglement,
the coupling of the quantum system and its subsystems to the
environment, resulting in decoherence, should be taken into

  

Source: Aravind, Padmanabhan K. - Department of Physics, Worcester Polytechnic Institute

 

Collections: Physics