Classical robustness of quantum unravellingsD. J. Atkins1, 2, Z. Brady1, K. Jacobs1, 2 and H. M. Wiseman1, 2
1 Centre for Quantum Dynamics, School of Science, Griffith University Brisbane, 4111 Queensland, Australia
2 Centre for Quantum Computer Technology - Australia
received 9 August 2004; accepted in final form 10 November 2004
published online 22 December 2004
We introduce three measures which quantify the degree to which quantum systems possess the robustness exhibited by classical systems when subjected to continuous observation. Using these we show that for a fixed environmental interaction the level of robustness depends on the measurement strategy, or unravelling, and that no single strategy is maximally robust in all ways.
03.65.Yz - Decoherence; open systems; quantum statistical methods.
42.50.Lc - Quantum fluctuations, quantum noise, and quantum jumps.
05.40.Jc - Brownian motion.
© EDP Sciences 2005