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Catching Shaped Microwave Photons with 99.4% Absorption Efficiency

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arxiv 1311.1180 v2 pith:V4KXZ7TU submitted 2013-11-05 quant-ph cond-mat.supr-con

J. Wenner , Yi Yin , Yu Chen , R. Barends , B. Chiaro , E. Jeffrey , J. Kelly , A. Megrant
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J. Y. Mutus C. Neill P. J. J. O'Malley P. Roushan D. Sank A. Vainsencher T. C. White Alexander N. Korotkov A. N. Cleland John M. Martinis
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classification quant-phcond-mat.supr-con
keywords absorptiondeterministicefficiencyfidelitiesmicrowavequantumqubitsreceiver
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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.

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