Tunable Coupling Scheme for Implementing High-Fidelity Two-Qubit Gates
Journal article, 2018

The prospect of computational hardware with quantum advantage relies critically on the quality of quantum-gate operations. Imperfect two-qubit gates are a major bottleneck for achieving scalable quantum-information processors. Here, we propose a generalizable and extensible scheme for a two-qubit tunable coupler that controls the qubit-qubit coupling by modulating the coupler frequency. Two-qubit gate operations can be implemented by operating the coupler in the dispersive regime, which is noninvasive to the qubit states. We investigate the performance of the scheme by simulating a universal two-qubit gate on a superconducting quantum circuit, and find that errors from known parasitic effects are strongly suppressed. The scheme is compatible with existing high-coherence hardware, thereby promising a higher gate fidelity with current technologies.

Quantum control

superconducting circuits

superconducting qubits

Quantum Computing

Quantum gates

Author

Fei Yan

Youngkyu Sung

Morten Kjaergaard

Daniel L Campbell

Terry P Orlando

Simon Gustavsson

William D Oliver

Physical Review Applied

2331-7019 (eISSN)

Vol. 10 5 054062

Subject Categories (SSIF 2011)

Telecommunications

Communication Systems

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1103/PhysRevApplied.10.054062

More information

Latest update

3/22/2021