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Title: Quantum control of surface acoustic-wave phonons

Journal Article · · Nature (London)
 [1];  [2];  [2];  [1];  [2];  [2];  [2];  [2];  [3];  [2];  [2];  [2];  [2];  [2];  [3];  [2];  [3]
  1. Univ. of California, Santa Barbara, CA (United States); Univ. of Chicago, Chicago, IL (United States)
  2. Univ. of Chicago, Chicago, IL (United States)
  3. Univ. of Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)

One of the hallmarks of quantum physics is the generation of non-classical quantum states and superpositions, which has been demonstrated in several quantum systems, including ions, solid-state qubits and photons. However, only indirect demonstrations of non-classical states have been achieved in mechanical systems, despite the scientific appeal and technical utility of such a capability, including in quantum sensing, computation and communication applications. This is due in part to the highly linear response of most mechanical systems, which makes quantum operations difficult, as well as their characteristically low frequencies, which hinder access to the quantum ground state. Here we demonstrate full quantum control of the mechanical state of a macroscale mechanical resonator. Furthermore, we strongly couple a surface acoustic-wave resonator to a superconducting qubit, using the qubit to control and measure quantum states in the mechanical resonator. We generate a non-classical superposition of the zero-and one-phonon Fock states and map this and other states using Wigner tomography. Such precise, programmable quantum control is essential to a range of applications of surface acoustic waves in the quantum limit, including the coupling of disparate quantum systems.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
David and Lucile Packard Foundation; National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1488391
Journal Information:
Nature (London), Journal Name: Nature (London) Journal Issue: 7733 Vol. 563; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Entanglement-based single-shot detection of a single magnon with a superconducting qubit journal January 2020
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Phononic band structure engineering for high-Q gigahertz surface acoustic wave resonators on lithium niobate text January 2019
Resolving the energy levels of a nanomechanical oscillator text January 2019
Resolving Phonon Fock States in a Multimode Cavity with a Double-Slit Qubit text January 2019
Unconventional Cavity Optomechanics: Nonlinear Control of Phonons in the Acoustic Quantum Vacuum text January 2019
Phonon-mediated quantum state transfer and remote qubit entanglement text January 2019
Piezoelectric transduction of a wavelength-scale mechanical waveguide text January 2019
Strong Mechanical Squeezing for a Levitated Particle by Coherent Scattering text January 2019
Entanglement-based single-shot detection of a single magnon with a superconducting qubit text January 2019