Decoherence and loss of entanglement

Vladimir Privman; Denis Tolkunov

doi:10.1117/12.604078

25 May 2005 Decoherence and loss of entanglement

Vladimir Privman, Denis Tolkunov

Proceedings Volume 5815, Quantum Information and Computation III; (2005) https://doi.org/10.1117/12.604078
Event: Defense and Security, 2005, Orlando, Florida, United States

Abstract

We review our recent work establishing by an explicit many-body calculation for an open quantum-mechanical system of two qubits subject to independent noise modelled by bosonic baths, a newly identified connection between two important quantities in the studies of entanglement and decoherence. We demonstrate that the decay of entanglement is governed by the product of the suppression factors describing decoherence of the subsystems (qubits). This result is a detailed model calculation proving an important and intuitively natural physical property that separated open quantum systems can evolve coherently, quantum mechanically on time scales larger than the times for which they remain entangled. Our result also suggests avenues for future work. Specifically, for multiqubit systems, it is expected that similar arguments should apply "by induction." This will stimulate research to develop appropriate quantitative measures of entanglement, and attempts to quantify entanglement and decoherence in a unified way. We considered one "physically meaningful" measure of two-qubit entanglement, the concurrence. In future research, it would be of interest to obtain similar results for other measures of entanglement as well.

Citation Download Citation

Vladimir Privman and Denis Tolkunov "Decoherence and loss of entanglement", Proc. SPIE 5815, Quantum Information and Computation III, (25 May 2005); https://doi.org/10.1117/12.604078

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available