Procedure for reducing cross-resonance gate errors using pulse-level control

Journal article

Current implementations of superconducting qubits are often limited by the low fidelities of multi-qubit gates. We present a reproducible and runtime-efficient pulse-level approach for calibrating an improved cross-resonance gate CR(θ) for arbitrary θ. This CR(θ) gate can be used to produce a wide range of other two-qubit gates via the application of standard single-qubit gates. By performing an interleaved randomised benchmarking sequence, we demonstrate that our approach leads to significantly lower incoherent errors than the circuit-level approach currently used by IBM. Hence, our procedure provides a genuine improvement for applications where noise remains a limiting factor.

Authors: Danin, D; Tennie, F

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: IOP Publishing
• Journal: Quantum Science and Technology
• Volume: 10
• Issue: 1
• Article number: 015026
• Publication date: 2024-11-13
• Acceptance date: 2024-10-21
• DOI: 10.1088/2058-9565/ad895b
• EISSN: 2058-9565
• Language: English
• Keywords: customised 2-qubit gates; quantum computing; superconducting qubits