Quantum Trajectories for Realistic Detection

Details Quantum Trajectories for Realistic Detection Quantum Trajectories for Realistic Detection

2001-12-21

arxiv.org/abs/quant-ph/0112129v1

PRA 65, 023802 (2002)

Physics

Quantum Physics

5 pages, 4 figures (3 .eps included, 1 jpeg as an additional file). To be published in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.65.023802

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.

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