  Due to their high coherence, a laser is a ubiquitous tool in science. We show
that by engineering the coupling between the gain medium and the laser cavity
as well as the laser cavity and the output port, it is possible to eliminate
most of the noise due to photons entering as well as leaving the laser cavity.
Hence, it is possible to reduce the laser linewidth by a factor equal to the
number of photons in the laser cavity below the standard quantum limit. We
design and theoretically analyze a superconducting circuit that uses Josephson
junctions, capacitors and inductors to implement a microwave laser, including
the low-noise couplers that allow the design to surpass the standard quantum
limit. Our proposal relies on the elements of superconducting quantum
information, and thus is an example of how quantum engineering techniques can
inspire us to re-imagine the limits of conventional quantum systems.
