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Area of Science:

  • Quantum acoustics
  • Superconducting circuits
  • Optomechanics

Background:

  • Electromagnetically induced transparency (EIT) is a quantum interference effect typically observed with light fields.
  • Superconducting artificial atoms, like transmon qubits, offer controllable quantum systems.
  • Acoustic fields can carry and process information, but interfacing them with quantum systems is challenging.

Purpose of the Study:

  • To demonstrate electromagnetically induced transparency (EIT) of a mechanical field.
  • To explore the interaction between superconducting qubits and acoustic waves.
  • To engineer superconducting circuits for novel quantum acoustic applications.

Main Methods:

  • Coupling a superconducting transmon qubit to a 1D transmission line supporting surface acoustic waves.
  • Utilizing an electromagnetic microwave field as a control beam to induce EIT.
  • Employing an acoustic probe beam to measure the transparency of the qubit.

Main Results:

  • Successfully observed EIT of the mechanical field in the superconducting circuit.
  • Demonstrated that a microwave control field can render the qubit transparent to the acoustic probe.
  • Showcased EIT in a ladder configuration due to suppressed upper-level relaxation, driven by frequency-dependent acoustic coupling.

Conclusions:

  • Superconducting circuits can be engineered to effectively interact with acoustic fields.
  • This work opens avenues for quantum acoustic devices and exploring quantum phenomena in new regimes.
  • The demonstrated control over acoustic fields using superconducting qubits is a significant advancement in quantum engineering.