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IEEE Access

Transferring Einstein-Podolsky-Rosen State Cross Frequency Bands via Cavity Electro-Opto-Mechanical Converters

Junwen Luo, Dewei Wu, Qiang Miao, Tianli Wei

Published Jan 1, 2020• 0 citations
Publisher

Abstract

In order to transfer two-mode quantum state from optical input to microwave output, we propose a scheme based on double cavity electro-opto-mechanical converters. Principles and operation modes of cavity electro-opto-mechanical converter are introduced in detail, and theoretical model of transferring Einstein-Podolsky-Rosen state via our scheme is built. The dynamics and corresponding scattering matrixes of our scheme are analyzed carefully. Meanwhile, Ulhmann fidelity is utilized to quantify the similarity of initial state and final state, which also stands for the performance of our scheme. Influences of coupling rates and optical input bandwidth on fidelity are well discussed, and some significant factors are also taken into consideration, such as transmission spectrum, interaction rates and decoherence rates. Furthermore, Wigner distributions of initial state and final state as well as the von Neumann entropy are obtained to verify the performance of our scheme. The results show that our scheme could transfer the Einstein-Podolsky-Rosen state from optical input to microwave output with high fidelity (0.74), and the entropy ratio between initial and final states is about 0.78, which is quite close with the fidelity. Besides, Wigner distributions also show that initial state and final state are slightly different in phase structures. In case of strong coupling rates, ultralow temperature and narrow input bandwidth, the performance of our scheme could be further enhanced.

DOI
10.1109/access.2020.3036679

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Optoelectromechanical quantum interfaces can be utilized to connect systems with distinctively different frequencies in hybrid quantum networks. Here we present a scheme of nonreciprocal quantum-state conversion between microwave and optical photons via an optoelectromechanical interface. By introducing an auxiliary cavity and manipulating the phase differences between the linearized light-matter couplings, unidirectional state transmission that is immune to mechanical noise can be achieved. This interface can function as an isolator, a circulator, and a two-way switch that routes the input state to a designated output channel. We show that under a generalized impedance matching condition the state conversion can prevent thermal fluctuations of the mechanical mode from propagating to the cavity outputs and reach high fidelity. The realization of this scheme is also discussed.
We study the problem of quantum state transfer from the optical cavity field to the microwave resonator in cavity electro-optic modulators. We give the analytical expression of the transfer fidelities of Gaussian states and some non-Gaussian states. We discuss the influences of the electro-optic coupling strength and the temperature of the environment on the fidelity of the state transfer. We show that it is possible to achieve high transfer fidelity for Gaussian states and some non-Gaussian states. We find that the transfer fidelity of the non-Gaussian state produced by performing the photon-addition operation, the photon-subtraction operation, or the photon-subtraction-then-addition operation on a Gaussian state is lower than that of the corresponding Gaussian state.
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