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Journal of Optical Technology

Quantum properties of a triple-coupled optical cavity with injection of a squeezed vacuum field

Ke Di, Jie Ren, Wei Cui, RenPu Li, Yongle Lu, Junqi Guo, Yu Liu, Jiajia Du

Published Mar 31, 2023• 0 citations

Abstract

Subject of study. A scheme of quantum manipulation in a coupled optical cavity system composed of a triple-coupled optical cavity with injection of a squeezed vacuum field is proposed. Method. The scheme of quantum manipulation in a coupled optical cavity system is based on analysis of the absorption and dispersion characteristics of the reflection in the classical field and the quantum field. Main results. It was established that the absorption and dispersion of the reflection field with different coupled intensities under the classical field show different characteristics. An electromagnetic induction transparency like effect is observed as the coupled intensities increase and becomes more and more obvious as the coupled intensities increase until the absorption curve becomes completely independent due to the strong coupled intensities. The quantum noise fluctuation corresponding to the amplitude and phase of the reflection field in the quantum field also presented different characteristics. With the increase of coupled intensities, the quantum noise fluctuation curve begins to split. At the same time, the splitting of the quantum noise fluctuation curve changes from one to three, and it completely splits into three Lorentz curves finally. Practical significance. The theoretical results of the scheme demonstrated that multiple (three times) quantum manipulation can be implemented simultaneously in a device, which provides a method for quantum dense coding.

DOI: 10.1364/jot.89.000722

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We experimentally investigate the optical cavity for various coupled regimes with an injected squeezed vacuum state. We measure the quantum fluctuation spectra of the reflected field of an optical cavity using the homodyne detection and present the spectral dependence on the absorption and dispersion properties of the cavity in the under-coupled, critically-coupled, and over-coupled regimes. The spectra lineshape is phase sensitive with the phase shift induced by the cavity. Moreover, we find that the over-coupled optical cavity has obvious advantage in the manipulation of quantum fluctuation.

We present the first experimental observation of quantum fluctuation spectra in two coupled optical cavities with an injected squeezed vacuum light. The quadrature components of the reflected squeezed vacuum spectra are measured by phase-sensitive homodyne detector. The experimental results demonstrate coupled-resonator-induced transparency in the quantum regime, in which the electromagnetically-induced-transparency-like characteristic of the absorption and dispersion properties of the coupled optical cavities determines the line shape of the reflected quantum noise spectra.

We experimentally investigate the optical cavity for various coupled regimes with an injected squeezed vacuum state.We measure the quantum fluctuation spectra of the reflected field of an optical cavity using the homodyne detection and present the spectral dependence on the absorption and dispersion properties of the cavity in the under-coupled, critically-coupled, and over-coupled regimes.The spectra lineshape is phase sensitive with the phase shift induced by the cavity.Moreover, we find that the over-coupled optical cavity has obvious advantage in the manipulation of quantum fluctuation.

In theory, we study the quantum fluctuations of the subharmonic reflected field from a triple-resonant degenerate optical parametric amplifier (OPA) inside an optical cavity. We discuss two cases, where the linewidth of the harmonic field is either much narrower or broader than the subharmonic field. Since an electromagnetically-induced-transparency (EIT)-like effect can be simulated in a triple-resonant OPA, the output spectra from a triple-resonant OPA with a squeezed vacuum input may simulate the phenomenon of the response of an EIT medium for squeezed states. This scheme can be implemented with present experimental setups.

A squeezed vacuum field can be amplified or deamplified when it is injected, as the signal beam, into a phase-sensitive optical parametric amplifier (OPA) inside an optical cavity. The spectral features of the reflected quantized signal field are controlled by the relative phase between the injected squeezed vacuum field and the pump field for the OPA. The experimental results demonstrate coherent phenomena of OPA in the quantum regime and show phase-sensitive manipulations of quantum fluctuations for quantum information processing.

The squeezing, entanglement, and statistical properties of cavity modes produced by V-type three-level laser coupled to squeezed vacuum reservoir were studied employing the steady state solutions of the expectation values of the cavity mode operators. The study showed that a light in squeezing state can be produced by the system under consideration under the condition that the cavity decay constant is larger than linear gain coefficient and the squeezing occurs in the plus-quadrature. The cavity modes do not exhibit entanglement properties. It is also observed that the degree of squeezing increases with the linear gain coefficient and squeezing parameter. We also determined the mean and variance of the photon number, intensity difference fluctuations, and the second order correlation function of the two modes. The mean and variance of the photon number as well as the correlation function of two modes decrease as the difference of the probability of the two states at initial time increases. The photons have super-poissionian statistics. The point, η, at which the maximum intensity difference fluctuation occurred depends on linear gain coefficient but not squeezing parameter. The result shows that the correlation of the two modes decreases as η the linear gain coefficient and squeezing parameter.