Strong single-photon coupling in superconducting quantum magnetomechanics.

Area of Science:

• Quantum physics
• Nanomechanics
• Superconducting circuits

Background:

• Achieving strong coupling between mechanical resonators and quantum circuits is crucial for quantum technologies.
• Superconducting circuits offer promising platforms for quantum information processing.

Purpose of the Study:

• To demonstrate strong single-photon nanomechanical coupling using a superconducting microcantilever.
• To explore the use of a superconducting strip in the Meissner state for enhanced magnetomechanical coupling.

Main Methods:

• Utilizing the inductive coupling between a superconducting microcantilever's quantum motion and a flux-dependent microwave quantum circuit.
• Employing a superconducting strip at the cantilever tip, subjected to an external quadrupole magnetic field.
• Collecting flux generated by induced sheet currents using a pickup coil.

Main Results:

• The proposed system attains the strong single-photon nanomechanical coupling regime.
• Feasible experimental parameters enable this strong coupling.
• The position-dependent magnetic response of the superconducting strip significantly enhances magnetomechanical coupling.

Conclusions:

• The study presents a viable method for achieving strong single-photon nanomechanical coupling.
• This approach enhances control over quantum circuits via superconducting nanomechanics.
• The findings pave the way for advancements in quantum sensing and computation.