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Measuring weak microwave signals via current-biased Josephson junctions: Approaching the quantum limit of energy detection

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This theory study evaluated a current-biased Josephson junction as a Josephson threshold detector for weak microwave signals and estimated few-photon-scale sensitivity, dynamic range, and the path toward the energy quantum limit.

Key Results

  • Modeled the phase-particle switching distributions with and without microwave drive
  • Estimated that the demonstrated detector regime could resolve roughly a dozen photons
  • Framed current-biased junctions as threshold detectors rather than processor phase qubits

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