Quantum-limited Directional Amplifiers with Optomechanics

ORAL

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 and 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.

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Presenters

  • Daniel Malz

    University of Cambridge, Department of Physics, University of Cambridge, Cavendish Laboratory, University of Cambridge, Physics, University of Cambridge

Authors

  • Daniel Malz

    University of Cambridge, Department of Physics, University of Cambridge, Cavendish Laboratory, University of Cambridge, Physics, University of Cambridge

  • Laszlo Daniel Toth

    Department of Physics, Ecole Polytechnique Federale de Lausanne, Ecole Polytech Fed de Lausanne, Institute of Physics, EPFL - Lausanne​

  • Nathan Bernier

    Department of Physics, Ecole Polytechnique Federale de Lausanne, Ecole Polytech Fed de Lausanne, Institute of Physics, EPFL - Lausanne​

  • Alexey Feofanov

    Department of Physics, Ecole Polytechnique Federale de Lausanne, Ecole Polytech Fed de Lausanne

  • Tobias Kippenberg

    Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, Swiss Fed Inst Tech, Physics, EPFL, Department of Physics, Ecole Polytechnique Federale de Lausanne, Ecole Polytech Fed de Lausanne, Institute of Physics, EPFL - Lausanne​

  • Andreas Nunnenkamp

    University of Cambridge, Department of Physics, University of Cambridge, Cavendish Laboratory, University of Cambridge, Physics, University of Cambridge