Physics – Quantum Physics
Scientific paper
2008-03-26
J. Russ. Laser Res. vol. 28, no. 5, 439-452 (2007) (topical issue on "Decoherence and entanglement in quantum systems" devoted
Physics
Quantum Physics
17 pages, 2 figures; talk at the X International Conference on Squeezed States and Uncertainty Relations (ICSSUR), Bradford, U
Scientific paper
In the framework of the theory of open systems based on completely positive quantum dynamical semigroups, we determine the degree of quantum decoherence of a harmonic oscillator interacting with a thermal bath. It is found that the system manifests a quantum decoherence which is more and more significant in time. We also calculate the decoherence time and show that it has the same scale as the time after which thermal fluctuations become comparable with quantum fluctuations. Then we solve the master equation for two independent harmonic oscillators interacting with an environment in the asymptotic long-time regime. We give a description of the continuous-variable asymptotic entanglement in terms of the covariance matrix of the quantum states of the considered system for an arbitrary Gaussian input state. Using the Peres-Simon necessary and sufficient condition for separability of two-mode Gaussian states, we show that the two non-interacting systems immersed in a common environment become asymptotically entangled for certain environments, so that in the long-time regime they manifest non-local quantum correlations.
No associations
LandOfFree
Decoherence and asymptotic entanglement in open quantum dynamics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Decoherence and asymptotic entanglement in open quantum dynamics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decoherence and asymptotic entanglement in open quantum dynamics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-49668