Experimentally realizable characterizations of continuous-variable Gaussian states
M. S. Kim, Jinhyoung Lee, William J. Munro · Physical Review A · 2002
Measures of entanglement, fidelity, and purity are basic yardsticks in quantum-information processing. We propose how to implement these measures using linear devices and homodyne detectors for continuous-variable Gaussian states. In particular, the test of entanglement becomes simple with some prior knowledge that is relevant to current experiments.