Journal
PHYSICAL REVIEW APPLIED
Volume 12, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.12.064013
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Funding
- United Kingdom Engineering and Physical Sciences Research Council [EP/J013501/1, EP/M013243/1, EP/N015118/1]
- Oxford Quantum Circuits Limited
- Oxford Instruments Nanoscience
- Stiftung der Deutschen Wirtschaft (sdw)
- Masason Foundation
- Nakajima Foundation
- EPSRC [EP/M013243/1, EP/J013501/1, EP/N015118/1] Funding Source: UKRI
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Quantum computation requires the precise control of the evolution of a quantum system, typically through application of discrete quantum-logic gates on a set of qubits. Here, we use the cross-resonance interaction to implement a gate between two superconducting transmon qubits with a direct static dispersive coupling. We demonstrate a practical calibration procedure for the optimization of the gate, combining continuous and repeated-gate Hamiltonian tomography with stepwise reduction of dominant two-qubit coherent errors through mapping to microwave control parameters. We show experimentally that this procedure can enable a (ZX) over cap (-pi/2) gate with a fidelity F = 97.0(7)%, measured with interleaved randomized benchmarking. We show this in an architecture with out-of-plane control and readout that is readily extensible to larger-scale quantum circuits.
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