Direct Microwave Measurement of Andreev-Bound-State Dynamics in a Semiconductor-Nanowire Josephson Junction
Direct Microwave Measurement of Andreev-Bound-State Dynamics in a Semiconductor-Nanowire Josephson Junction
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DOI：
10.1103/physrevlett.121.047001
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发表时间：
2018-07-23
影响因子：
8.6
通讯作者：
Devoret, M. H.
中科院分区：
文献类型：
--
作者：
Hays, M.;de Lange, G.;Devoret, M. H.
现代对介观器件中约瑟夫森效应的理解源于Andreev束缚态的物理学，束缚态是超导弱连接中的费米子模式。最近，使用半导体纳米线构建的约瑟夫森结已经导致实现具有栅极可调谐约瑟夫森能量的超导量子比特。我们已经使用了微波电路QED架构来检测Andreev束缚态在这样一个基于铝邻近砷化铟纳米线的栅极可调结。我们证明了这些束缚态的相干操纵，并在真实的时间跟踪束缚态费米子宇称。由于非平衡准粒子的个别宇称切换事件观察到的特征时间尺度T-宇称= 160 +/- 10 μ s。拓扑纳米线结的T-宇称设定了控制马约拉纳束缚态所需带宽的下限。
The modem understanding of the Josephson effect in mesosopic devices derives from the physics of Andreev bound states, fermionic modes that are localized in a superconducting weak link. Recently, Josephson junctions constructed using semiconducting nanowires have led to the realization of superconducting qubits with gate-tunable Josephson energies. We have used a microwave circuit QED architecture to detect Andreev bound states in such a gate-tunable junction based on an aluminum-proximitized indium arsenide nanowire. We demonstrate coherent manipulation of these bound states, and track the bound-state fermion parity in real time. Individual parity-switching events due to nonequilibrium quasiparticles are observed with a characteristic timescale T-parity = 160 +/- 10 mu s. The T-parity of a topological nanowire junction sets a lower bound on the bandwidth required for control of Majorana bound states.