Quantum trajectories for realistic detection
- 4 January 2002
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 65 (2) , 023802
- https://doi.org/10.1103/physreva.65.023802
Abstract
Quantum trajectories describe the stochastic evolution of an open quantum system conditioned on continuous monitoring of its output, such as, by an ideal photodetector. Here we derive (non-Markovian) quantum trajectories for realistic photodetection, including the effects of efficiency, dead time, bandwidth, electronic noise, and dark counts. We apply our theory to a realistic cavity QED scenario and investigate the impact of such detector imperfections on the conditional evolution of the system state. A practical theory of quantum trajectories with realistic detection will be essential for experimental and technological applications of quantum feedback in many areas.Keywords
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