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Nonclassicality of output fields from seeded nondegenerate optical parametric oscillator

Chanseul Lee, Tai Hyun Yoon

Published Apr 5, 2024• 0 citations
Publisher

Abstract

We discuss nonclassical light properties, in particular, focused on multi-photon quantum correlations in quantum optics. We analyze two-mode fields from a nondegenerate optical parametric oscillator below threshold using criteria introduced by Agarwal1 and Lee. Additionally, we identify that system parameters like pump and seed coherent amplitudes influence the nonclassicality of the output quantum state.

DOI
10.1117/12.3027102

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We discuss nonclassical light properties, in particular, focused on multi-photon quantum correlations in quantum optics. We analyze two-mode fields from a nondegenerate optical parametric oscillator below threshold using criteria introduced by Agarwal1 and Lee. Additionally, we identify that system parameters like pump and seed coherent amplitudes influence the nonclassicality of the output quantum state.
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We present a versatile method for producing two-mode stabilized squeezed coherent state (SSCS) of light with controllable nonclassicality. Our method involves seeding phase-coherent bichromatic fields into a nondegenerate optical parametric oscillator (OPO), where the global phase difference Φ\PhiΦ between the bichromatic seed and pump fields plays a central role. When Φ=2nπ\Phi=2n\piΦ=2nπ, where nnn is an integer, we show that the two-mode SSCS has its nonclassical measure at its minimum possible value with an effective displacement that compensates for single-photon losses with injected photons. As a result, the SSCS has a larger mean photon number and controllable nonclassicality compared to an OPO without seed fields. We also show that near-perfect squeezing level can be obtained at that effective displacement without being subject to injection rates. We believe that the proposed quantum source of two-mode SSCS with controllable nonclassicality would be useful for continuous-variable photonic quantum information processing.
We present a versatile method for producing two-mode stabilized squeezed coherent state (SSCS) of light with controllable nonclassicality. Our method involves seeding phase-coherent bichromatic fields into a nondegenerate optical parametric oscillator (OPO), where the global phase difference Φ\PhiΦ between the bichromatic seed and pump fields plays a central role. When Φ=2nπ\Phi=2n\piΦ=2nπ, where nnn is an integer, we show that the two-mode SSCS has its nonclassical measure at its minimum possible value with an effective displacement that compensates for single-photon losses with injected photons. As a result, the SSCS has a larger mean photon number and controllable nonclassicality compared to an OPO without seed fields. We also show that near-perfect squeezing level can be obtained at that effective displacement without being subject to injection rates. We believe that the proposed quantum source of two-mode SSCS with controllable nonclassicality would be useful for continuous-variable photonic quantum information processing.
We show that an optical parametric oscillator which is simultaneously resonant for several modes, either spatial or temporal, generates both below and above threshold a multimode nonclassical state of light consisting of squeezed vacuum states in all the nonoscillating modes. We confirm this prediction by an experiment dealing with the degenerate TEM01{}_{01}01​ and TEM10{}_{10}10​ modes. We show the conservation of nonclassical properties when the threshold is crossed. The experiment is made possible by the implementation of a new method to lock the relative phase of the pump and the injected beam.