Complete Characterization of Quantum-Optical Processes
Mirko Lobino,
Dmitry Korystov,
Connor Kupchak,
Eden Figueroa,
Barry C. Sanders,
A. I. Lvovsky*
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,
that is, 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.
* To whom correspondence should be addressed. E-mail: lvov{at}ucalgary.ca
