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Light-matter decoupling and A(2) term detection in superconducting circuits.

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A stronger diamagnetic term in superconducting qubits effectively decouples them from electromagnetic fields. This effect, observable across coupling strengths, can surprisingly increase emission rates with qubit-line separation.

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Area of Science:

  • Quantum computing
  • Superconducting circuits
  • Quantum optics

Background:

  • Superconducting qubits exhibit light-matter interactions similar to atoms.
  • These interactions can include a diamagnetic term proportional to the square of the vector potential (A²).

Purpose of the Study:

  • To investigate the impact of the diamagnetic term on qubit-electromagnetic field interaction.
  • To demonstrate that increasing the diamagnetic term strength leads to qubit decoupling.
  • To propose a method for observing this decoupling effect.

Main Methods:

  • Theoretical analysis of effective light-matter interaction in superconducting qubits.
  • Proposal of a transmon qubit suspended over a transmission line for experimental measurement.
  • Control of the diamagnetic term strength via qubit-line separation.

Main Results:

  • An increased diamagnetic term strength causes effective decoupling of the qubit from the electromagnetic field.
  • This decoupling effect is observable regardless of the qubit-photon coupling strength.
  • The spontaneous emission rate of a suspended transmon can increase with qubit-line separation at short distances.

Conclusions:

  • The diamagnetic term plays a crucial role in controlling qubit-electromagnetic field interactions.
  • Experimental observation of this decoupling effect is feasible using suspended transmon architectures.
  • This finding offers new avenues for controlling qubit coherence and emission properties.