Millisecond charge-parity fluctuations and induced decoherence in a superconducting transmon qubit.
Millisecond charge-parity fluctuations and induced decoherence in a superconducting transmon qubit.
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DOI：
10.1038/ncomms2936
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发表时间：
2013
影响因子：
16.6
通讯作者：
DiCarlo L
中科院分区：
文献类型：
--
作者：
Ristè D;Bultink CC;Tiggelman MJ;Schouten RN;Lehnert KW;DiCarlo L
超导量子电路中准粒子穿过约瑟夫森结的隧道效应是量子位自由度的固有退相干机制。了解准粒子隧道效应对量子位弛豫和相移所施加的限制具有理论和实验意义，特别是随着对外在机制的理解的加深，跨蒙型电荷量子位可以跨越 100 微秒大关。在这里，通过将高保真量子位读出和反馈控制的最新进展集成到电路量子电动力学中，我们将最先进的传输转换成自己的实时电荷奇偶校验检测器。我们直接测量准粒子穿过单结的隧道效应，并隔离这种隧道效应对量子位弛豫和移相的贡献，而不依赖于理论。测量的毫秒时间尺度表明，准粒子隧道效应目前并未成为传输量子比特相干性的瓶颈，为另一个数量级的增长留下了空间。 超导电路在量子计算方面很有前景，但跨约瑟夫森结的准粒子隧道效应会引入量子位退相干。里斯特等人。将 Transmon 量子位转换为其自己的实时准粒子隧道探测器，并精确测量毫秒范围内的诱导退相干。
The tunnelling of quasiparticles across Josephson junctions in superconducting quantum circuits is an intrinsic decoherence mechanism for qubit degrees of freedom. Understanding the limits imposed by quasiparticle tunnelling on qubit relaxation and dephasing is of theoretical and experimental interest, particularly as improved understanding of extrinsic mechanisms has allowed crossing the 100 microsecond mark in transmon-type charge qubits. Here, by integrating recent developments in high-fidelity qubit readout and feedback control in circuit quantum electrodynamics, we transform a state-of-the-art transmon into its own real-time charge-parity detector. We directly measure the tunnelling of quasiparticles across the single junction and isolate the contribution of this tunnelling to qubit relaxation and dephasing, without reliance on theory. The millisecond timescales measured demonstrate that quasiparticle tunnelling does not presently bottleneck transmon qubit coherence, leaving room for yet another order of magnitude increase. Superconducting circuits are promising for quantum computing, but quasiparticle tunnelling across Josephson junctions introduces qubit decoherence. Ristè et al. convert a transmon qubit into its own real-time quasiparticle tunnelling detector and accurately measure induced decoherence in the millisecond range.
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