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Diabatic gates for frequency-tunable superconducting qubits

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arxiv 1907.02510 v1 pith:DMTVBQSZ submitted 2019-07-04 quant-ph

R. Barends , C. M. Quintana , A. G. Petukhov , Yu Chen , D. Kafri , K. Kechedzhi , R. Collins , O. Naaman
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S. Boixo F. Arute K. Arya D. Buell B. Burkett Z. Chen B. Chiaro A. Dunsworth B. Foxen A. Fowler C. Gidney M. Giustina R. Graff T. Huang E. Jeffrey J. Kelly P. V. Klimov F. Kostritsa D. Landhuis E. Lucero M. McEwen A. Megrant X. Mi J. Mutus M. Neeley C. Neill E. Ostby P. Roushan D. Sank K. J. Satzinger A. Vainsencher T. White J. Yao P. Yeh A. Zalcman H. Neven V. N. Smelyanskiy John M. Martinis
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keywords gatesdiabaticfrequency-tunablequbitssuperconductingachievedagreesapproach
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abstract

We demonstrate diabatic two-qubit gates with Pauli error rates down to $4.3(2)\cdot 10^{-3}$ in as fast as 18 ns using frequency-tunable superconducting qubits. This is achieved by synchronizing the entangling parameters with minima in the leakage channel. The synchronization shows a landscape in gate parameter space that agrees with model predictions and facilitates robust tune-up. We test both iSWAP-like and CPHASE gates with cross-entropy benchmarking. The presented approach can be extended to multibody operations as well.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Methods for Measuring Magnetic Flux Crosstalk Between Tunable Transmons

    quant-ph 2019-08 conditional novelty 7.0 of 10

    Three direct measurements of DC and AC flux crosstalk between tunable transmons are presented, along with a derived relation between AC crosstalk and parametric CZ gate infidelity.

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