Self-stabilized Quantum Optical Fredkin Gate

TL;DR

This paper introduces a fiber-based quantum optical Fredkin gate that self-stabilizes against pump fluctuations using stimulated Raman scattering, enhancing practical quantum communication applications.

Contribution

It presents a novel self-stabilization method for quantum optical Fredkin gates employing stimulated Raman scattering in fiber-based systems.

Findings

High switching contrast maintained despite pump fluctuations

Demonstrates viability of fiber-based, low-loss quantum gates

Potential for practical quantum communication networks

Abstract

Quantum optical Fredkin gate is an indispensable resource for networkable quantum applications. Its performance in practical implementations, however, is limited fundamentally by the inherent quantum fluctuations of the pump waves. We demonstrate a method to overcome this drawback by exploiting stimulated Raman scattering in fiber-based implementations. Using a Sagnac fiber-loop switch as a specific example, we show that high switching contrast can be maintained even in the presence of significant pump fluctuations. This unique feature of self-stabilization, together with high-speed and low-loss performance of such devices, point to a viable technology for practical quantum communications.