Design of a Discrete-Time Fault-Tolerant Quantum Filter and Fault Detector

This paper solves the problem of discrete-time fault-tolerant quantum filtering for a class of laser–atom open quantum systems subject to the stochastic faults. We show that by using the discrete-time quantum measurements, optimal estimates of both the atomic observables and the classical fault process can be simultaneously determined in terms of recursive quantum stochastic difference equations. A dispersive interaction quantum system example is used to demonstrate the proposed filtering approach.

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