Catching Shaped Microwave Photons with 99.4% Absorption Efficiency

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We demonstrate a high efficiency deterministic quantum receiver to convert flying qubits to logic qubits.

• We employ a superconducting resonator, which is driven with a shaped pulse through an adjustable coupler.
• For the ideal "time reversed" shape, we measure absorption and receiver fidelities at the single microwave photon level of, respectively, 99.41% and 97.4%.
• These fidelities are comparable with gates and measurement and exceed the deterministic quantum communication and computation fault tolerant thresholds.