Optical stabilization of voltage fluctuations in half-Josephson lasers

Kavli Institute of Nanoscience, Delft University of Technology - P.O. Box 5046, 2600 GA Delft, The Netherlands, EU

Received: 18 June 2013
Accepted: 17 July 2013

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 the 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.