High-fidelity controlled-Z gate with maximal intermediate leakage operating at the speed limit in a superconducting quantum processor
arXiv:2008.07411 · doi:10.1103/PhysRevLett.126.220502
Abstract
We introduce the sudden variant (SNZ) of the Net Zero scheme realizing controlled- (CZ) gates by baseband flux control of transmon frequency. SNZ CZ gates operate at the speed limit of transverse coupling between computational and non-computational states by maximizing intermediate leakage. The key advantage of SNZ is tuneup simplicity, owing to the regular structure of conditional phase and leakage as a function of two control parameters. We realize SNZ CZ gates in a multi-transmon processor, achieving fidelity and leakage. SNZ is compatible with scalable schemes for quantum error correction and adaptable to generalized conditional-phase gates useful in intermediate-scale applications.
13 pages, 11 figures and 3 tables
References in corpus (8)
- Supplementary information for "Quantum supremacy using a programmable superconducting processor"
- Surface codes: Towards practical large-scale quantum computation
- Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
- Simple pulses for elimination of leakage in weakly nonlinear qubits
- Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
- Digital quantum simulation of fermionic models with a superconducting circuit
- Benchmarking Coherent Errors in Controlled-Phase Gates due to Spectator Qubits
- A leakage-resilient approach to fault-tolerant quantum computing with superconducting elements
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