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. 2019 Nov 22;123(21):210501.
doi: 10.1103/PhysRevLett.123.210501.

Diabatic Gates for Frequency-Tunable Superconducting Qubits

R Barends  1 , C M Quintana  1 , A G Petukhov  2 , Yu Chen  1 , D Kafri  2 , K Kechedzhi  2 , R Collins  1 , O Naaman  1 , S Boixo  2 , F Arute  1 , K Arya  1 , D Buell  1 , B Burkett  1 , Z Chen  1 , B Chiaro  3 , A Dunsworth  1 , B Foxen  3 , A Fowler  1 , C Gidney  1 , M Giustina  1 , R Graff  1 , T Huang  1 , E Jeffrey  1 , J Kelly  1 , P V Klimov  1 , F Kostritsa  1 , D Landhuis  1 , E Lucero  1 , M McEwen  3 , A Megrant  1 , X Mi  1 , J Mutus  1 , M Neeley  1 , C Neill  1 , E Ostby  2 , P Roushan  1 , D Sank  1 , K J Satzinger  1 , A Vainsencher  1 , T White  1 , J Yao  1 , P Yeh  1 , A Zalcman  1 , H Neven  2 , V N Smelyanskiy  2 , John M Martinis  1   3
Affiliations

Diabatic Gates for Frequency-Tunable Superconducting Qubits

R Barends et al. Phys Rev Lett. .

Abstract

We demonstrate diabatic two-qubit gates with Pauli error rates down to 4.3(2)×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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