Suppressing Spurious Transitions Using Spectrally Balanced Pulse

Achieving precise control over quantum systems presents a significant challenge, especially in many-body setups, where residual couplings and unintended transitions undermine the accuracy of quantum operations. In superconducting qubits, parasitic interactions-both between distant qubits and with spurious two-level systems-can severely limit the performance of quantum gates. In this Letter, we introduce a pulse-shaping technique that uses spectrally balanced microwave pulses to suppress undesired transitions. Experimental results demonstrate an order-of-magnitude reduction in spurious excitations between weakly detuned qubits as well as a substantial decrease in single-qubit gate errors caused by a strongly coupled two-level defect over a broad frequency range. Our method provides a simple yet powerful solution for mitigating adverse effects from parasitic couplings, enhancing quantum gate fidelity. The pulse-shaping technique can be readily adapted to various physical systems.

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Publication Details

Journal
Physical Review Letters
Published
2025-10-14
DOI
https://doi.org/10.1103/h4xf-vq2l
Citations
2
Primary Topic
Quantum Information and Cryptography
Type
article
Field-Weighted Citation Impact
4.96
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Suppressing Spurious Transitions Using Spectrally Balanced Pulse

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Physical Review Letters
Quantum Information and Cryptography
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Suppressing Spurious Transitions Using Spectrally Balanced Pulse

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article en
2 citations

Abstract

Achieving precise control over quantum systems presents a significant challenge, especially in many-body setups, where residual couplings and unintended transitions undermine the accuracy of quantum operations. In superconducting qubits, parasitic interactions-both between distant qubits and with spurious two-level systems-can severely limit the performance of quantum gates. In this Letter, we introduce a pulse-shaping technique that uses spectrally balanced microwave pulses to suppress undesired transitions. Experimental results demonstrate an order-of-magnitude reduction in spurious excitations between weakly detuned qubits as well as a substantial decrease in single-qubit gate errors caused by a strongly coupled two-level defect over a broad frequency range. Our method provides a simple yet powerful solution for mitigating adverse effects from parasitic couplings, enhancing quantum gate fidelity. The pulse-shaping technique can be readily adapted to various physical systems.

Physical Review LettersVol. 135(16)
Forschungszentrum Jülich (DE), University of Cologne (DE), Chinese Academy of Sciences (CN), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), Beijing Academy of Quantum Information Sciences (CN), Institute of Physics (CN), University of Chinese Academy of Sciences (CN)
Openalex Percentile: Top 5%
Quantum Information and Cryptography
4.96
DOISourceOpenAlex
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