Implementation of Conditional Phase Gates Based on Tunable ZZ Interactions
Collodo MC, Herrmann J, Lacroix N, Andersen CK, Remm A, Lazar S, Besse JC, Walter T, Wallraff A, Eichler C (2020)
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 125
Article Number: 240502
Journal Issue: 24
DOI: 10.1103/PhysRevLett.125.240502
Abstract
High fidelity two-qubit gates exhibiting low cross talk are essential building blocks for gate-based quantum information processing. In superconducting circuits, two-qubit gates are typically based either on rf-controlled interactions or on the in situ tunability of qubit frequencies. Here, we present an alternative approach using a tunable cross-Kerr-type ZZ interaction between two qubits, which we realize with a flux-tunable coupler element. We control the ZZ-coupling rate over 3 orders of magnitude to perform a rapid (38 ns), high-contrast, low leakage (0.14±0.24%) conditional phase CZ gate with a fidelity of 97.9±0.7% as measured in interleaved randomized benchmarking without relying on the resonant interaction with a noncomputational state. Furthermore, by exploiting the direct nature of the ZZ coupling, we easily access the entire conditional phase gate family by adjusting only a single control parameter.
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Switzerland (CH)How to cite
APA:
Collodo, M.C., Herrmann, J., Lacroix, N., Andersen, C.K., Remm, A., Lazar, S.,... Eichler, C. (2020). Implementation of Conditional Phase Gates Based on Tunable ZZ Interactions. Physical Review Letters, 125(24). https://dx.doi.org/10.1103/PhysRevLett.125.240502
MLA:
Collodo, Michele C., et al. "Implementation of Conditional Phase Gates Based on Tunable ZZ Interactions." Physical Review Letters 125.24 (2020).
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