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Master Equation for Retrodiction of Quantum Communication Signals

Stephen M. Barnett, David T. Pegg, John Jeffers, Ottavia Jedrkiewicz

quant-pharXiv:quant-ph/0107139

Abstract

We derive the master equation that governs the evolution of the measured state backwards in time in an open system. This allows us to determine probabilities for a given set of preparation events from the results of subsequent measurements, which has particular relevance to quantum communication.

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