Complete Characterization of Quantum-Optical Processes

Details Complete Characterization of Quantum-Optical Processes Complete Characterization of Quantum-Optical Processes

2008-11-17

arxiv.org/abs/0811.2784v1

Science 322, 563-565 (2008)

Physics

Quantum Physics

5 pages, 4 figures

Scientific paper

10.1126/science.1162086

The technologies of quantum information and quantum control are rapidly improving, but full exploitation of their capabilities requires complete characterization and assessment of processes that occur within quantum devices. We present a method for characterizing, with arbitrarily high accuracy, any quantum optical process. Our protocol recovers complete knowledge of the process by studying, via homodyne tomography, its effect on a set of coherent states, i.e. classical fields produced by common laser sources. We demonstrate the capability of our protocol by evaluating and experimentally verifying the effect of a test process on squeezed vacuum.

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