# Diabatic gates for frequency-tunable superconducting qubits

**Authors:** R. Barends, C. M. Quintana, A. G. Petukhov, Yu Chen, D. Kafri, K., Kechedzhi, R. Collins, O. Naaman, 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, and John M. Martinis

arXiv: 1907.02510 · 2019-11-22

## TL;DR

This paper demonstrates fast, high-fidelity diabatic two-qubit gates in frequency-tunable superconducting qubits by synchronizing entangling parameters with leakage minima, enabling robust and efficient quantum operations.

## Contribution

It introduces a novel diabatic gate technique that achieves low error rates and fast operation times in superconducting qubits, with a validated synchronization method.

## Key findings

- Pauli error rates as low as 4.3e-3 achieved
- Gate times as short as 18 ns demonstrated
- Synchronization landscape matches model predictions

## 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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Source: https://tomesphere.com/paper/1907.02510