Nonlinear Sideband Cooling to a Cat State of Motion

B. D. Hauer, J. Combes, and J. D. Teufel
Phys. Rev. Lett. 130, 213604 – Published 25 May 2023
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Abstract

The ability to prepare a macroscopic mechanical resonator into a quantum superposition state is an outstanding goal of cavity optomechanics. Here, we propose a technique to generate cat states of motion using the intrinsic nonlinearity of a dispersive optomechanical interaction. By applying a bichromatic drive to an optomechanical cavity, our protocol enhances the inherent second-order processes of the system, inducing the requisite two-phonon dissipation. We show that this nonlinear sideband cooling technique can dissipatively engineer a mechanical resonator into a cat state, which we verify using the full Hamiltonian and an adiabatically reduced model. While the fidelity of the cat state is maximized in the single-photon, strong-coupling regime, we demonstrate that Wigner negativity persists even for weak coupling. Finally, we show that our cat state generation protocol is robust to significant thermal decoherence of the mechanical mode, indicating that such a procedure may be feasible for near-term experimental systems.

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  • Received 1 August 2022
  • Accepted 14 March 2023

DOI:https://doi.org/10.1103/PhysRevLett.130.213604

© 2023 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

B. D. Hauer1,*, J. Combes2, and J. D. Teufel1,†

  • 1National Institute of Standards and Technology, Boulder, Colorado 80305, USA
  • 2Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, Colorado 80309, USA

  • *Corresponding author. bradley.hauer@nist.gov
  • Corresponding author. john.teufel@nist.gov

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Vol. 130, Iss. 21 — 26 May 2023

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