Enhancing Microwave-Optical Bell Pairs Generation for Quantum Transduction Using Kerr Nonlinearity

TL;DR

This paper introduces a pulsed SPDC scheme utilizing Kerr nonlinearity to generate high-fidelity microwave-optical Bell pairs efficiently, overcoming limitations of traditional methods for quantum transduction.

Contribution

It proposes a novel pulsed nonlinear SPDC approach that leverages Kerr nonlinearity to improve Bell pair generation fidelity and probability in quantum transduction.

Findings

High-fidelity Bell pairs achieved with optimized pulse parameters

Outperforms traditional SPDC in realistic settings

Mitigates fidelity-probability trade-off in photon pair generation

Abstract

Microwave-optical quantum transduction can be achieved via quantum teleportation using microwave-optical photon Bell pairs. The standard spontaneous parametric down-conversion (SPDC) has to trade off between generation fidelity and probability due to unwanted higher-excitation pairs in the output. In this work, we propose a pulsed SPDC scheme that employs strong Kerr nonlinearity in the microwave mode. This nonlinearity causes significant detuning of higher excitations due to the anharmonicity of energy levels, and the system can be pulse-driven to produce single-photon pairs in the output. Our pulsed nonlinear approach can generate high-fidelity Bell pairs with high probability, alleviating the trade-off between fidelity and probability inherent in traditional SPDC schemes. We optimize both the pulse width and driving strength, demonstrating that our protocol outperforms the SPDC scheme in a realistic setting of finite nonlinearity and intrinsic photon loss.