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Researchers demonstrate sideband cooling of radio frequency (RF) circuits, enabling quantum ground state access below the gigahertz domain. This breakthrough advances RF quantum photonics by overcoming thermal decoherence.

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Area of Science:

  • Quantum physics
  • Superconducting circuits
  • Quantum optics

Background:

  • Quantum control of electromagnetic fields is established in optical and gigahertz regimes.
  • Thermal decoherence hinders quantum regime access below gigahertz frequencies in cryogenic systems.

Purpose of the Study:

  • To engineer a system for quantum control of radio frequency (RF) fields.
  • To overcome thermal decoherence limitations for sub-gigahertz quantum photonics.

Main Methods:

  • Engineered two superconducting LC circuits coupled via photon-pressure interaction.
  • Utilized a microwave cavity for sideband cooling of a hot RF circuit.

Main Results:

  • Achieved single-photon quantum cooperativity (Cq0) of approximately 1.
  • Reduced thermal RF occupancy by 75% with minimal pump photons.
  • Cooled the RF circuit to the quantum ground state by exceeding the decoherence rate.

Conclusions:

  • Demonstrated effective sideband cooling for RF circuits.
  • Laid the foundation for practical RF quantum photonics.
  • Enabled quantum regime access for sub-gigahertz frequencies.