Quantum-Limited Directional Amplifiers with Optomechanics.
- Malz D Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
- Tóth LD Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland.
- Bernier NR Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland.
- Feofanov AK Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland.
- Kippenberg TJ Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland.
- Nunnenkamp A Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
- 2018-01-30
Published in:
- Physical review letters. - 2018
English
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.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.120.023601
- PMID 29376677
- Persistent URL
- https://sonar.ch/global/documents/99571
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