Creating photon-number squeezed strong microwave fields by a Cooper-pair injection laser

TL;DR

This paper proposes a laser design using Cooper-pair transistors that generates photon-number squeezed microwave fields with high photon numbers, demonstrating robustness against disorder.

Contribution

The paper introduces a novel laser scheme with Cooper-pair transistors that produces nonclassical, photon-number squeezed microwave radiation under realistic conditions.

Findings

Creates photon-number squeezed microwave radiation with Fano factor F << 1

Operates effectively over a broad range of parameters

Remains robust against gate-charge disorder

Abstract

The use of artificial atoms as an active lasing medium opens a way to construct novel sources of nonclassical radiation. An example is the creation of photon-number squeezed light. Here we present a design of a laser consisting of multiple Cooper-pair transistors coupled to a microwave resonator. Over a broad range of experimentally realizable parameters, this laser creates photon-number squeezed microwave radiation, characterized by a Fano factor $F \ll 1$, at a very high resonator photon number. We investigate the impact of gate-charge disorder in a Cooper-pair transistor and show that the system can create squeezed strong microwave fields even in the presence of maximum disorder.