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

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dc.contributor.authorLiu, Chenxuen
dc.contributor.authorMucci, Mariaen
dc.contributor.authorCao, Xien
dc.contributor.authorDutt, M. V. Gurudeven
dc.contributor.authorHatridge, Michaelen
dc.contributor.authorPekker, Daviden
dc.date.accessioned2022-03-29T19:19:45Zen
dc.date.available2022-03-29T19:19:45Zen
dc.date.issued2021-09-23en
dc.description.abstractLaser performance is constrained by various factors. Here, the authors show theoretically that the linewidth can be reduced below the standard quantum limit by engineering the output coupling of a laser to reduce noise, and discuss the potential practical implementation of this approach. 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.en
dc.description.notesWe thank Andrew Daley, John Jeffers, and Howard Wiseman for helpful comments. C.L. acknowledges support from a Pittsburgh Quantum Institute graduate student fellowship. Research was also supported by the Army Research Office under Grants Number W911NF-18-1-0144 and W911NF-15-1-0397, and by M. Hatridge's NSF CAREER grant (PHY-1847025). M.V.G.D. was partially supported by NSF EFRI ACQUIRE 1741656. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for government purposes notwithstanding any copyright notation herein.en
dc.description.sponsorshipPittsburgh Quantum Institute graduate student fellowship; Army Research Office [W911NF-18-1-0144, W911NF-15-1-0397]; M. Hatridge's NSF CAREER grant [PHY-1847025]; NSF EFRI ACQUIRE [1741656]en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1038/s41467-021-25879-8en
dc.identifier.eissn2041-1723en
dc.identifier.issue1en
dc.identifier.other5620en
dc.identifier.pmid34556650en
dc.identifier.urihttp://hdl.handle.net/10919/109492en
dc.identifier.volume12en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleProposal for a continuous wave laser with linewidth well below the standard quantum limiten
dc.title.serialNature Communicationsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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