Diabatic Gates for Frequency-Tunable Superconducting Qubits

Diabatic Gates for Frequency-Tunable Superconducting Qubits

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 para...

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Veröffentlicht in:Physical review letters 2019-11, Vol.123 (21), p.210501-210501, Article 210501
Hauptverfasser: 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
Format: Artikel
Sprache:eng
Schlagworte:
Parameters
Superconductivity
Synchronism
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Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.123.210501