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.9 MoreReceived 17 July 2020Revised 26 August 2021Accepted 8 December 2021DOI:https://doi.org/10.1103/PRXQuantum.3.010312Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasEntanglement detectionMeasurement-based quantum computingQuantum information processing with continuous variablesQuantum information with hybrid systemsPhysical SystemsNanomechanical devicesSQUIDTechniquesSurface acoustic waveQuantum InformationCondensed Matter, Materials & Applied Physics
Highlights
Quantum computation and simulation show potential for tackling difficult computational problems by leveraging superposition and entanglement in engineered quantum devices
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
Summary
Quantum computation and simulation show potential for tackling difficult computational problems by leveraging superposition and entanglement in engineered quantum devices. The use of continuous variables (CVs) allows for realizations of measurement-based quantum computing with frequency combs, requiring only a small number of coupled quantum systems [7,8]. We demonstrate an approach towards realizing CV quantum computation based on cluster state generation and control in a multimode hybrid superconducting quantum acoustic device. Due to the narrow free spectral range, the SQUID reflector gives rise to coupling of more than 20 modes We exploit this coupling to generate two-mode squeezed states between phonons in different SAW modes with a parametric drive. Our results suggest this quantum acoustic platform can be used to create highly entangled multimode states for CV quantum computing
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