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**1 - 4**of**4**### Entanglement in the above-threshold optical parametric oscillator

"... We investigate entanglement in the above-threshold optical parametric oscillator, both theoretically and experimentally, and discuss its potential applications to quantum information. The fluctuations measured in the subtraction of signal and idler amplitude quadratures are ⌬ 2 p − = 0.50͑1͒, or −3 ..."

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We investigate entanglement in the above-threshold optical parametric oscillator, both theoretically and experimentally, and discuss its potential applications to quantum information. The fluctuations measured in the subtraction of signal and idler amplitude quadratures are ⌬ 2 p − = 0.50͑1͒, or −3.01͑9͒ dB, and in the sum of phase quadratures they are ⌬ 2 q + = 0.73͑1͒, or −1.37͑6͒ dB. A detailed experimental study of the noise behavior as a function of pump power is presented, and the discrepancies with theory are discussed.

### Oliveira-Huguenin†, Claude Fabre†, and

, 2005

"... Entanglement of two-mode Gaussian states: characterization and experimental production and manipulation ..."

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Entanglement of two-mode Gaussian states: characterization and experimental production and manipulation