Experimental Realization of a Fast Controlled-Z Gate via a Shortcut to Adiabaticity
Abstract
For a frequency-tunable two-qubit system, a controlled-Z (cz) gate can be realized by adiabatic driving of the qubit system through an avoided level crossing between an auxiliary state and computational levels. Here we theoretically propose a fast cz gate using a shortcut to adiabaticity (STA). Experimentally, the STA cz gate is implemented with a 52-ns control pulse for two coupled superconducting Xmon qubits. The measured fidelity of the STA cz gate is higher than 96.0% in both quantum-process tomography and randomized benchmarking. The protocol allows a flexible design of the evolution time and control waveform. We suggest that this "fast adiabatic" cz gate can be directly applied to other multiqubit quantum systems.
- Publication:
-
Physical Review Applied
- Pub Date:
- March 2019
- DOI:
- 10.1103/PhysRevApplied.11.034030
- arXiv:
- arXiv:1811.08096
- Bibcode:
- 2019PhRvP..11c4030W
- Keywords:
-
- Quantum Physics
- E-Print:
- 7 pages, 4 figures