Catching Shaped Microwave Photons with 99.4% Absorption Efficiency

Abstract

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.

Main paper: 5 pages, 4 figures. Supplement: 11 pages, 12 figures. Revised abstract and introduction. Minor changes to Figure 1 and figure captions