Journal
PHOTONICS
Volume 9, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/photonics9090620
Keywords
continuous-variable entanglement; non-Hermitian systems; quantum noise
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Funding
- NSF [1806519, EFMA-1741693]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1806519] Funding Source: National Science Foundation
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We examine the gain saturation effect in non-Hermitian systems of coupled gain-loss waveguides and whispering-gallery-mode microresonators, and generate continuous-variable entanglement of light fields through this system. The study shows that stable entanglement can be generated under gain saturation, and it exhibits squeezing characteristics.
We examine the gain saturation effect in non-Hermitian systems of coupled gain-loss waveguides and whispering-gallery-mode microresonators, through which a continuous-variable (CV) entanglement of light fields is generated. Here, we consider squeezed vacuum inputs for coupled waveguide setup and coherent drive for coupled microresonators, and study the influence from the saturation of the used optical gain. Unlike the ideal situation without gain saturation, it is possible to generate stabilized entanglement measured by logarithmic negativity under gain saturation. Both types of setups realize steady CV entanglement, provided that the gain saturation is sufficiently quick. Particularly, with the coupled microresonators which are pumped by coherent drive, the created CV entanglement is actually out of the gain noise with a squeezing characteristic, under the condition of fast saturation of the initial optical gain.
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