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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/12093

Title: Persistent entanglement in two coupled squid rings in the quantum to classical transition: a quantum jumps approach
Authors: Everitt, Mark J.
Keywords: Quantum mechanics
Decoherence
Open systems
Quantum jumps
SQUID rings
Entanglement
Correspondence principle
Classical transition
Issue Date: 2009
Publisher: © Springer Science+Business Media, Inc.
Citation: EVERITT, M.J., 2009. Persistent entanglement in two coupled squid rings in the quantum to classical transition: a quantum jumps approach. Journal of Russian Laser Research, 30 (5), pp. 412 - 417.
Abstract: We explore the quantum–classical crossover of two coupled, identical, superconducting quantum interference device (SQUID) rings. The motivation for this work is based on a series of recent papers. In [1] we showed that the entanglement characteristics of chaotic and periodic (entrained) solutions of the Duffing oscillator differed significantly and that in the classical limit entanglement was preserved only in the chaotic-like solutions. However, Duffing oscillators are a highly idealized toy system. Motivated by a wish to explore more experimentally realizable systems, we extended our work in [2, 3] to an analysis of SQUID rings. In [3] we showed that the two systems share a common feature. That is, when the SQUID ring’s trajectories appear to follow (semi)classical orbits, entanglement persists. Our analysis in [3] was restricted to the quantum-state diffusion unraveling of the master equation – representing unit efficiency heterodyne detection (or ambi-quadrature homodyne detection). Here we show that very similar behavior occurs using the quantum jumps unraveling of the master equation. Quantum jumps represents a discontinuous photon counting measurement process. Hence, the results presented here imply that such persistent entanglement is independent of measurement process and that our results may well be quite general in nature.
Description: This article was published in the Journal of Russian Laser Research [© Springer Science+Business Media, Inc.] and the definitive version is available at: http://dx.doi.org/10.1007/s10946-009-9106-x
Version: Accepted for publication
DOI: 10.1007/s10946-009-9106-x
URI: https://dspace.lboro.ac.uk/2134/12093
Publisher Link: http://dx.doi.org/10.1007/s10946-009-9106-x
ISSN: 1071-2836
Appears in Collections:Published Articles (Physics)

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