Optical stabilization of voltage fluctuations in half-Josephson lasers

TL;DR

This paper proposes optical feedback schemes utilizing the phase-lock in half-Josephson lasers to stabilize voltage fluctuations and control superconducting phase diffusion.

Contribution

It introduces two novel optical feedback methods to reduce phase diffusion in half-Josephson lasers, enabling optical control of superconducting phases.

Findings

Significant decrease in superconducting phase diffusion coefficient.

Quenching of relative phase diffusion between lasers.

Potential for optical control of voltage fluctuations.

Abstract

A recently proposed device, dubbed half-Josephson laser, provides a phase-lock between the optical phase and the superconducting phase difference between the leads of the device. In this paper we propose to utilize this phase-lock for stabilization of voltage fluctuations, by two optical feedback schemes. The first scheme involves a single half-Josephson laser and allows to significantly decrease the diffusion coefficient of the superconducting phase difference. The second scheme involves a stable optical source and a fluctuating half-Josephson laser and permits quenching of the diffusion of the relative phase of the lasers. This opens up perspectives of the optical control of the superconducting phase and voltage fluctuations.