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.
@article{arxiv.1907.02510,
title = {Diabatic gates for frequency-tunable superconducting qubits},
author = {R. Barends and C. M. Quintana and A. G. Petukhov and Yu Chen and D. Kafri and K. Kechedzhi and R. Collins and O. Naaman and S. Boixo and F. Arute and K. Arya and D. Buell and B. Burkett and Z. Chen and B. Chiaro and A. Dunsworth and B. Foxen and A. Fowler and C. Gidney and M. Giustina and R. Graff and T. Huang and E. Jeffrey and J. Kelly and P. V. Klimov and F. Kostritsa and D. Landhuis and E. Lucero and M. McEwen and A. Megrant and X. Mi and J. Mutus and M. Neeley and C. Neill and E. Ostby and P. Roushan and D. Sank and K. J. Satzinger and A. Vainsencher and T. White and J. Yao and P. Yeh and A. Zalcman and H. Neven and V. N. Smelyanskiy and John M. Martinis},
journal= {arXiv preprint arXiv:1907.02510},
year = {2019}
}