Diabatic gates for frequency-tunable superconducting qubits

Authors :: Barends, R.
Quintana, C. M.
Petukhov, A. G.
Chen, Yu
Kafri, D.
Kechedzhi, K.
Collins, R.
Naaman, O.
Boixo, S.
Arute, F.
Arya, K.
Buell, D.
Burkett, B.
Chen, Z.
Chiaro, B.
Dunsworth, A.
Foxen, B.
Fowler, A.
Gidney, C.
Giustina, M.
Graff, R.
Huang, T.
Jeffrey, E.
Kelly, J.
Klimov, P. V.
Kostritsa, F.
Landhuis, D.
Lucero, E.
McEwen, M.
Megrant, A.
Mi, X.
Mutus, J.
Neeley, M.
Neill, C.
Ostby, E.
Roushan, P.
Sank, D.
Satzinger, K. J.
Vainsencher, A.
White, T.
Yao, J.
Yeh, P.
Zalcman, A.
Neven, H.
Smelyanskiy, V. N.
Martinis, John M.
Source :: Phys. Rev. Lett. 123, 210501 (2019)
Publication Year :: 2019
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.<br />Comment: Main text: 6 pages, 4 figures. Supplementary: 2 pages, 2 figures

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