自参数共振将 Cat Qubit 的比特翻转时间延长至 0.3 秒

IF 11.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Physical Review X Pub Date : 2024-04-26 DOI:10.1103/physrevx.14.021019
A. Marquet, A. Essig, J. Cohen, N. Cottet, A. Murani, E. Albertinale, S. Dupouy, A. Bienfait, T. Peronnin, S. Jezouin, R. Lescanne, B. Huard
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引用次数: 0

摘要

猫量子比特的逻辑|0⟩和|1⟩是谐波模式的相干态|±α⟩,它为量子纠错提供了一条前景广阔的途径。利用耗散的优势,使谐波模式的光子对与其环境中的单光子进行交换,就有可能稳定逻辑状态,并以光子数|α|2的指数级增长猫量子比特的位翻转时间。较大的双光子耗散率κ2 可确保快速的量子比特操作和较短的纠错周期,这对于纠正猫量子比特重复代码中剩余的相位翻转错误非常重要。在这里,我们引入并运行了一种自参数超导电路,它能将包含猫量子比特的模式与有损模式耦合,而有损模式的频率设定为猫模式的两倍。这种无源耦合不需要参量泵,其速率可达κ2/2π≈2 MHz。有了如此强大的双光子耗散,自参数猫量子比特的比特翻转误差就能在高达 0.3 秒的特性时间内得到防止,而对相位翻转误差只有轻微影响。此外,我们还说明了如何在保持工程耗散激活的同时,通过驱动谐波模式任意改变|α⟩和|-α⟩之间的量子叠加相位。
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Autoparametric Resonance Extending the Bit-Flip Time of a Cat Qubit up to 0.3 s
Cat qubits, for which logical |0 and |1 are coherent states |±α of a harmonic mode, offer a promising route towards quantum error correction. Using dissipation to our advantage so that photon pairs of the harmonic mode are exchanged with single photons of its environment, it is possible to stabilize the logical states and exponentially increase the bit-flip time of the cat qubit with the photon number |α|2. A large two-photon dissipation rate κ2 ensures fast qubit manipulation and short error-correction cycles, which are instrumental to correct the remaining phase-flip errors in a repetition code of cat qubits. Here, we introduce and operate an autoparametric superconducting circuit that couples a mode containing the cat qubit to a lossy mode whose frequency is set at twice that of the cat mode. This passive coupling does not require a parametric pump, and it reaches a rate κ2/2π2MHz. With such a strong two-photon dissipation, bit-flip errors of the autoparametric cat qubit are prevented for a characteristic time up to 0.3 s with only a mild impact on phase-flip errors. In addition, we illustrate how the phase of a quantum superposition between |α and |α can be arbitrarily changed by driving the harmonic mode while keeping the engineered dissipation active.
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来源期刊
Physical Review X
Physical Review X PHYSICS, MULTIDISCIPLINARY-
CiteScore
24.60
自引率
1.60%
发文量
197
审稿时长
3 months
期刊介绍: Physical Review X (PRX) stands as an exclusively online, fully open-access journal, emphasizing innovation, quality, and enduring impact in the scientific content it disseminates. Devoted to showcasing a curated selection of papers from pure, applied, and interdisciplinary physics, PRX aims to feature work with the potential to shape current and future research while leaving a lasting and profound impact in their respective fields. Encompassing the entire spectrum of physics subject areas, PRX places a special focus on groundbreaking interdisciplinary research with broad-reaching influence.
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