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

Abstract

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.

34 pages, 23 figures

References in corpus (10)

• Charge insensitive qubit design derived from the Cooper pair box
• Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
• Observation of squeezed light with 10dB quantum noise reduction
• Single artificial-atom lasing
• Demonstration of an ac Josephson junction laser
• Quantum interferometer combining squeezing and parametric amplification
• Practical quantum computing on encrypted data
• Stroboscopic qubit measurement with squeezed illumination
• The Heisenberg limit for laser coherence
• Proposal for a continuous wave laser with linewidth well below the standard quantum limit

Cited by in corpus (9)

• Continuous Bose-Einstein condensation
• Many-body quantum state diffusion for non-Markovian dynamics in strongly interacting systems
• Proposal for a continuous wave laser with linewidth well below the standard quantum limit
• Quantum noise and its evasion in feedback oscillators
• No Tradeoff between Coherence and Sub-Poissonianity for Heisenberg-Limited Lasers
• Optimized Laser Models with Heisenberg-Limited Coherence and Sub-Poissonian Beam Photon Statistics
• Engineering the Nonlinearity of Bosonic Modes with a Multi-loop SQUID
• Engineering a multi-level bath for transmons with three-wave mixing and parametric drives
• On-chip microwave coherent source with in-situ control of the photon number distribution