Characterization and Tuneup of High-Fidelity Two-Qubit Operations on a Parametrically Driven Gate
ORAL
Abstract
Maintaining the fidelity of single- and two-qubit gates is a necessary requirement for building a quantum computer, especially in the NISQ era where every gate is critical. At the ideal limit without coherent or systematic errors, the gate fidelity fluctuates as T1 fluctuates. It is important to be able to characterize the timescales over which system parameters may fall out of calibration, and the worst-performance cases should be reported. Here we present our work towards characterizing these effects, and we compare schemes for automating the recalibration process on a device consisting of fixed-frequency transmon qubits with a tunable coupler. The coupler is parametrically driven to selectively perform an iSWAP or CZ gate. Our results indicate that we are primarily limited by incoherent errors with single-qubit gates performing with >99.9% fidelity and two-qubit gates with fidelities >99.0%.
*Knut and Alice Wallenberg Foundation, Swedish Research Council, EU Flagship on Quantum Technology
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Presenters
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Christopher Warren
- Chalmers Univ of Tech
- Microtechnology and Nanoscience, Chalmers University of Technology