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.

superconducting circuits

superconducting qubits

Quantum gates

Quantum Computing

Quantum control

Author

Fei Yan

Massachusetts Institute of Technology (MIT)

Philip Krantz

Administration MC2

Youngkyu Sung

Massachusetts Institute of Technology (MIT)

Morten Kjaergaard

Massachusetts Institute of Technology (MIT)

Daniel L Campbell

Massachusetts Institute of Technology (MIT)

Terry P Orlando

Massachusetts Institute of Technology (MIT)

Simon Gustavsson

Massachusetts Institute of Technology (MIT)

William D Oliver

Massachusetts Institute of Technology (MIT)

Physical Review Applied

2331-7019 (eISSN)

Vol. 10 5 054062

Subject Categories

Telecommunications

Communication Systems

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1103/PhysRevApplied.10.054062

More information

Created

8/8/2019 7