Critical slowing down in circuit quantum electrodynamics.
Critical slowing down in circuit quantum electrodynamics.
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DOI：
10.1126/sciadv.abe9492
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发表时间：
2021-05
期刊：
影响因子：
13.6
通讯作者：
Szymanska MH
中科院分区：
文献类型：
--
作者：
Brookes P;Tancredi G;Patterson AD;Rahamim J;Esposito M;Mavrogordatos TK;Leek PJ;Ginossar E;Szymanska MH
观察到与传输子耦合的微波谐振腔的临界慢化饱和现象。系统达到平衡所需时间的临界慢化是耗散一级相变中双稳性的关键特征。理解和描述这一过程可以揭示发生在这种转变附近的潜在多体动力学。在这里，我们探讨了丰富的量子激活动力学和临界减速的工程超导量子电路的外观。具体来说，我们调查的中间体制度的广义Jaynes-Cummings哈密顿量（GJC），实现了电路量子电动力学（cQED）系统组成的transmon量子比特耦合到微波腔。我们发现了一个先前未识别的量子激活机制，其中临界减速达到饱和，通过将我们的实验结果与一系列模型进行比较，我们揭示了量子位在该机制中所起的基本作用。
A saturation of critical slowing down in the bistable regime of a microwave resonator couple to a transmon is observed. Critical slowing down of the time it takes a system to reach equilibrium is a key signature of bistability in dissipative first-order phase transitions. Understanding and characterizing this process can shed light on the underlying many-body dynamics that occur close to such a transition. Here, we explore the rich quantum activation dynamics and the appearance of critical slowing down in an engineered superconducting quantum circuit. Specifically, we investigate the intermediate bistable regime of the generalized Jaynes-Cummings Hamiltonian (GJC), realized by a circuit quantum electrodynamics (cQED) system consisting of a transmon qubit coupled to a microwave cavity. We find a previously unidentified regime of quantum activation in which the critical slowing down reaches saturation and, by comparing our experimental results with a range of models, we shed light on the fundamental role played by the qubit in this regime.