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TT: Fachverband Tiefe Temperaturen

TT 41: Matter at Low Temperature: Quantum Liquids, Bose-Einstein-Condensates, Ultra-cold Atoms

TT 41.13: Talk

Thursday, March 26, 2009, 17:30–17:45, HSZ 105

Quantum trajectories for dispersive readout in superconducting circuit QED — •Ferdinand Helmer and Florian Marquardt — Department of Physics, CeNS, and ASC, Ludwig-Maximilians-Universität, Theresienstrasse 37, D-80333 Munich, Germany

We present applications for the method of quantum trajectory simulations for the realistic simulation of single-shot readout experiments in superconducting circuit QED. Quantum trajectories generated by stochastic master equations allow to obtain a realistic measurement signal while one simultaneously gains access to the internal quantum dynamics of the system in question taking the measurement back-action into account correctly. Thus, useful insights beyond the ensemble average description of a conventional master equation can be obtained.

To illustrate the power of the method, we present two important examples: (i) How to detect single itinerant microwave photons non-destructively (ii) How to generate massively entangled N-qubit states like W- and GHZ-states by measurement. We point out the presented examples can be realized using currently available experimental setups.