Continuous-variables two-mode entanglement: experimental generation and characterization by measurements of symplectic invariants
Julien Laurat, T. Coudreau, G. Keller, J. A. O. Huguenin, Nicolas Treps, Claude Fabre, Gerardo Adesso, A. Serafimi, Fabrizio Illuminati · 2006
We report on the experimental demonstration of strong quadrature EPR entanglement with a single type-II phase-matched self-phase-locked optical parametric oscillator below threshold and characterize this entanglement using the covariance matrix formalism.