Maximally Robust Unravelings of Quantum Master Equations
H. M. Wiseman, J. A. Vaccaro
Abstract
The stationary solution ρof a quantum master equation can be represented as an ensemble of pure states in a continuous infinity of ways. An ensemble which is physically realizable through monitoring the system's environment we call an `unraveling'. The survival probability S(t) of an unraveling is the average probability for each of its elements to be unchanged a time t after cessation of monitoring. The maximally robust unraveling is the one for which S(t) remains greater than the largest eigenvalue of ρfor the longest time. The optical parametric oscillator is a soluble example.
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