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Testing the entanglement of intense beams produced by an optical parametric oscillator

Alessandro S. Villar, Luciano Soares da Cruz, M. Martinelli, P. Nussenzveig

Published Jan 1, 2004• 0 citations
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Bright three-color entangled state produced by cascaded optical parametric oscillators

Aihong Tan, Changde Xie, Kunchi Peng

We propose a generation system of continuous-variable (CV) three-color entangled state of bright optical beams based on two cascaded standard nondegenerate optical parametric oscillators (NOPOs) above the threshold. One of signal and idler beams produced by the first NOPO is used for the pump light of the second NOPO. The three-color entanglement among signal and idler beams produced by the second NOPO and the retained another beam of the first NOPO is theoretically demonstrated. The symplectic eigenvalues of the partial transposition covariance matrix of the generated optical entangled state are numerically calculated in terms of experimentally reachable system parameters. The optimal operation conditions of the cascaded NOPOs system for obtaining high entanglement are found. The calculated results explicitly demonstrate that the OPO action can transfer entanglement. Due to that the cavity parameters and the nonlinear crystals of the two NOPOs can be freely chosen, the flexibility of the proposed protocol is relatively good and the system can be also extended to prepare entangled states with more parts easily.

Physical Review A•Jan 17, 2012•16 citations

Phase-difference squeezing and entanglement from a stable type-II optical parametric oscillator

Sheng Feng, Olivier Pfister

APS•May 1, 2002•0 citations

Entanglement and quantum correlations in the optical parametric oscillator above threshold

K. N. Cassemiro, Alessandro S. Villar, Paulo Valente +2 more

We describe several recent experimental studies in the above-threshold optical parametric oscillator (OPO). Seventeen years after the original prediction, entanglement of the twin beams was experimentally demonstrated in 2005. It was followed by the prediction that the OPO should directly produce tripartite pump-signal-idler entangled beams. We also present experimental quantum correlations among these three fields.

Journal of Physics Conference Series•Oct 1, 2007•0 citations

The optical quantum entanglement experiments

F. J. Duarte

Institute of Physics eBooks•Sep 1, 2022•0 citations
We propose a generation system of continuous-variable (CV) three-color entangled state of bright optical beams based on two cascaded standard nondegenerate optical parametric oscillators (NOPOs) above the threshold. One of signal and idler beams produced by the first NOPO is used for the pump light of the second NOPO. The three-color entanglement among signal and idler beams produced by the second NOPO and the retained another beam of the first NOPO is theoretically demonstrated. The symplectic eigenvalues of the partial transposition covariance matrix of the generated optical entangled state are numerically calculated in terms of experimentally reachable system parameters. The optimal operation conditions of the cascaded NOPOs system for obtaining high entanglement are found. The calculated results explicitly demonstrate that the OPO action can transfer entanglement. Due to that the cavity parameters and the nonlinear crystals of the two NOPOs can be freely chosen, the flexibility of the proposed protocol is relatively good and the system can be also extended to prepare entangled states with more parts easily.