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

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