Proposal for a continuous wave laser with linewidth well below the standard quantum limit

Chenxu Liu (), Maria Mucci, Xi Cao, M. V. Gurudev Dutt, Michael Hatridge and David Pekker ()
Additional contact information
Chenxu Liu: University of Pittsburgh
Maria Mucci: University of Pittsburgh
Xi Cao: University of Pittsburgh
M. V. Gurudev Dutt: University of Pittsburgh
Michael Hatridge: University of Pittsburgh
David Pekker: University of Pittsburgh

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Due to their high coherence, lasers are ubiquitous tools 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.

Date: 2021
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DOI: 10.1038/s41467-021-25879-8

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