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Rapid High-Fidelity Single-Shot Dispersive Readout of Superconducting Qubits

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Demonstrates rapid, high-fidelity dispersive readout of a superconducting transmon qubit using a Purcell-filtered readout resonator and quantum-limited Josephson parametric amplifier. Achieves 99.6% single-shot readout fidelity in 48 ns — fast enough for real-time feedback in QEC.

Key Results

  • Readout fidelity: 99.6% in 48 ns integration time
  • 99.2% fidelity in 24 ns
  • Uses JPA (Josephson parametric amplifier) for quantum-limited amplification
  • Purcell filter prevents readout-induced qubit decay

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