This title appears in the Scientific Report :
2023
Please use the identifier:
http://dx.doi.org/10.34734/FZJ-2023-04772 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevApplied.19.024057 in citations.
Parasitic-Free Gate: An Error-Protected Cross-Resonance Switch in Weakly Tunable Architectures
Parasitic-Free Gate: An Error-Protected Cross-Resonance Switch in Weakly Tunable Architectures
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 qub...
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Personal Name(s): | Xu, Xuexin (Corresponding author) |
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Ansari, Mohammad | |
Contributing Institute: |
Theoretische Nanoelektronik; PGI-2 |
Published in: | Physical review applied, 19 (2023) 2, S. 024057 |
Imprint: |
College Park, Md. [u.a.]
American Physical Society
2023
|
DOI: |
10.34734/FZJ-2023-04772 |
DOI: |
10.1103/PhysRevApplied.19.024057 |
Document Type: |
Journal Article |
Research Program: |
Verbundprojekt: German Quantum Computer based on Superconducting Qubits (GEQCOS) - Teilvorhaben: Charakterisierung, Kontrolle und Auslese Advanced Solid-State Qubits and Qubit Systems |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevApplied.19.024057 in citations.
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. |