Squeezing and multimode entanglement of surface acoustic wave phonons

Abstract

Exploiting multiple modes in a quantum acoustic device could enable applications in quantum information in a hardware-efficient setup, including quantum simulation in a synthetic dimension and continuous-variable quantum computing with cluster states.We develop a multimode surface acoustic wave (SAW) resonator with a superconducting quantum interference device (SQUID) integrated in one of the Bragg reflectors. The interaction with the SQUID-shunted mirror gives rise to coupling between the more than 20 accessible resonator modes. We exploit this coupling to demonstrate two-mode squeezing of SAW phonons, as well as four-mode multipartite entanglement. Our results open avenues for continuous-variable quantum computing in a compact hybrid quantum system.

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• Chiral phonons and phononic birefringence in ferromagnetic metal - bulk acoustic resonator hybrids
• Tunable coupling of a quantum phononic resonator to a transmon qubit with flip-chip architecture
• Kerr-magnon-assisted asymptotic stationary photon-phonon squeezing
• Electron qubits surfing on acoustic waves: review of recent progress
• Control of multi-modal scattering in a microwave frequency comb
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• Multimode Phonon-Polaritons in Lead-Halide Perovskites in the Ultrastrong Coupling Regime
• Manipulation of magnetic systems by quantized surface acoustic wave via piezomagnetic effect
• Hybrid quantum surface acoustic wave with skyrmion qubit for quantum information processing
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• Measurement and control of a superconducting quantum processor with a fully-integrated radio-frequency system on a chip
• High quality quasinormal modes of phononic crystals for quantum acoustodynamics
• Solving the inverse parametric problem
• Remote magnon-phonon entanglement in the waveguide-magnomechanics
• Multimode Gaussian steady state engineering in optomechanical systems with a squeezed reservoir