Publication: Quantum control of tunable-coupling transmons using dynamical invariants of motion
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2023-04
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IOP Science
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Abstract
We analyze the implementation of a fast nonadiabatic CZ gate between two transmon qubits with tunable coupling. The gate control method is based on a theory of dynamical invariants which leads to reduced leakage and robustness against decoherence. The gate is based on a description of the resonance between the 11 and 20 using an effective Hamiltonian with the six lowest energy states. A modification of the protocol allows us to take into account the higher-order perturbative corrections of this effective model. This enables a gate fidelity several orders of magnitude higher than other quasiadiabatic protocols, with gate times that approach the theoretical limit.
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Superconducting circuits, Quantum control, Quantum computing
Bibliographic citation
Espinós, H., Panadero, I., García-Ripoll, J. J., & Torrontegui, E. (2023). Quantum control of tunable-coupling transmons using dynamical invariants of motion. Quantum science and technology, 8(2), 025017.