Journal Article

FZJ-2023-04772

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Parasitic-Free Gate: An Error-Protected Cross-Resonance Switch in Weakly Tunable Architectures

Xu, X. (Corresponding author)FZJ* ; Ansari, M.FZJ*

2023
American Physical Society College Park, Md. [u.a.]

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Please use a persistent id in citations: doi:10.1103/PhysRevApplied.19.024057  doi:10.34734/FZJ-2023-04772

Abstract: In two-qubit gates activated by microwave pulses, by turning the pulse on or off, the state of qubits is swapped between entangled or idle modes. In either mode, the presence of stray couplings makes qubits accumulate coherent phase error. However, the error rates in the two modes differ because qubits carry different stray coupling strengths in each mode; therefore, eliminating stray coupling from one mode does not remove it from the other. We propose to combine such a gate with a tunable coupler and show that both idle and entangled qubits can become free from stray couplings. This significantly increases the operational switch fidelity in quantum algorithms. We further propose a weakly tunable qubit as an optimum coupler to bring the two modes parametrically near each other. This remarkably enhances the tuning process by reducing its leakage.

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Contributing Institute(s):

1. Theoretische Nanoelektronik (PGI-2)

Research Program(s):

1. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)
2. Verbundprojekt: German Quantum Computer based on Superconducting Qubits (GEQCOS) - Teilvorhaben: Charakterisierung, Kontrolle und Auslese (13N15685) (13N15685)

Appears in the scientific report 2023

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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