Quantum-limited directional amplifiers with optomechanics

Malz, Daniel; T?th, L�zl? D; Bernier, Nathan R; Feofanov, Alexey K; Kippenberg, Tobias J; Nunnenkamp, Andreas

Abstract

Directional amplifiers are an important resource in quantum-information processing, as they protect sensitive quantum systems from excess noise. Here, we propose an implementation of phase-preserving and phase-sensitive directional amplifiers for microwave signals in an electromechanical setup comprising two microwave cavities and two mechanical resonators. We show that both can reach their respective quantum limits on added noise. In the reverse direction, they emit thermal noise stemming from the mechanical resonators; we discuss how this noise can be suppressed, a crucial aspect for technological applications. The isolation bandwidth in both is of the order of the mechanical linewidth divided by the amplitude gain. We derive the bandwidth and gain-bandwidth product for both and find that the phase-sensitive amplifier has an unlimited gain-bandwidth product. Our study represents an important step toward flexible, on-chip integrated nonreciprocal amplifiers of microwave signals.

Citation

Malz, D., Tόth, L. D., Bernier, N. R., Feofanov, A. K., Kippenberg, T. J., & Nunnenkamp, A. (2018). Quantum-limited directional amplifiers with optomechanics. Physical Review Letters, 120(2), Article 023601. https://doi.org/10.1103/PhysRevLett.120.023601

• Journal Article Type: Article
• Acceptance Date: Oct 13, 2017
• Online Publication Date: Jan 8, 2018
• Publication Date: Jan 12, 2018
• Deposit Date: Jul 14, 2020
• Publicly Available Date: Aug 14, 2020
• Journal: Physical Review Letters
• Print ISSN: 0031-9007
• Electronic ISSN: 1079-7114
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 120
• Issue: 2
• Article Number: 023601
• DOI: https://doi.org/10.1103/PhysRevLett.120.023601
• Public URL: https://nottingham-repository.worktribe.com/output/4765652
• Publisher URL: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.023601
• Additional Information: © 2018 American Physical Society