Combating fluctuations in relaxation times of fixed-frequency transmon qubits with microwave-dressed states

Zhao, Peng; Ma, Teng; Jin, Yirong; Yu, Haifeng

doi:10.48550/arxiv.2203.07857

Cited by 1 publication

(1 citation statement)

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“…The ability to tune TLS out of resonance with a qubit is especially beneficial for processors implementing fixedfrequency qubits, which can be tuned only in a limited range by exploiting the AC-stark shift 41 . This may still allow one to improve qubit coherence by evading strongly coupled TLS as it was recently demonstrated by Zhao et al 42 . However, even when tunable qubits are used, it is still necessary to mutually balance their individual resonance frequencies to avoid crosstalk and to maximize gate fidelities, and this will be greatly simplified if qubit coherence can be optimized at all frequencies by having independent control of the TLS bath.…”

Section: ❈❖◆❈▲❯❙■❖◆mentioning

confidence: 80%

Enhancing the Coherence of Superconducting Quantum Bits with Electric Fields

Lisenfeld

Bilmes

Ustinov

2022

Preprint

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In the endeavour to make quantum computers a reality, integrated superconducting circuits have become a promising architecture. A major challene of this approach is decoherence originating from spurious atomic tunneling defects at the interfaces of qubit electrodes, which may resonantly absorb energy from the qubit's oscillating electric field and reduce the qubit's energy relaxation time T1. Here, we show that qubit coherence can be improved by tuning dominating defects away from the qubit resonance using an applied DC-electric field. We demonstrate a method that optimizes the applied field bias and enhances the average qubit T1-time by 23%. We also discuss how local gate electrodes can be implemented in superconducting quantum processors to enable simultaneous in-situ coherence optimization of individual qubits.

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Section: ❈❖◆❈▲❯❙■❖◆mentioning

confidence: 80%