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Entanglement and Photon Anti-Bunching in Coupled Non-Degenerate Parametric Oscillators

1
Physics and Informatics Laboratories, NTT Research Inc., 940 Stewart Dr, Sunnyvale, CA 94085, USA
2
E. L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Gerard Milburn and Sally Shrapnel
Entropy 2021, 23(5), 624; https://doi.org/10.3390/e23050624
Received: 31 March 2021 / Revised: 10 May 2021 / Accepted: 13 May 2021 / Published: 17 May 2021
(This article belongs to the Special Issue Quantum Measurement and Control in Quantum Machine Learning)
We analytically and numerically show that the Hillery-Zubairy’s entanglement criterion is satisfied both below and above the threshold of coupled non-degenerate optical parametric oscillators (NOPOs) with strong nonlinear gain saturation and dissipative linear coupling. We investigated two cases: for large pump mode dissipation, below-threshold entanglement is possible only when the parametric interaction has an enough detuning among the signal, idler, and pump photon modes. On the other hand, for a large dissipative coupling, below-threshold entanglement is possible even when there is no detuning in the parametric interaction. In both cases, a non-Gaussian state entanglement criterion is satisfied even at the threshold. Recent progress in nano-photonic devices might make it possible to experimentally demonstrate this phase transition in a coherent XY machine with quantum correlations. View Full-Text
Keywords: entanglement; quantum optics; laser entanglement; quantum optics; laser
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MDPI and ACS Style

Inui, Y.; Yamamoto, Y. Entanglement and Photon Anti-Bunching in Coupled Non-Degenerate Parametric Oscillators. Entropy 2021, 23, 624. https://doi.org/10.3390/e23050624

AMA Style

Inui Y, Yamamoto Y. Entanglement and Photon Anti-Bunching in Coupled Non-Degenerate Parametric Oscillators. Entropy. 2021; 23(5):624. https://doi.org/10.3390/e23050624

Chicago/Turabian Style

Inui, Yoshitaka, and Yoshihisa Yamamoto. 2021. "Entanglement and Photon Anti-Bunching in Coupled Non-Degenerate Parametric Oscillators" Entropy 23, no. 5: 624. https://doi.org/10.3390/e23050624

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