Telegraph noise in coupled quantum dot circuits induced by a quantum point contact.
Telegraph noise in coupled quantum dot circuits induced by a quantum point contact.
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由量子点接触引起的耦合量子点电路中的电报噪声。
DOI：
10.1103/physrevlett.100.176805
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发表时间：
2008
影响因子：
8.6
通讯作者：
S. Ludwig
中科院分区：
文献类型：
--
作者：
D. Taubert;M. Pioro;D. Schröer;D. Harbusch;A. Sachrajda;S. Ludwig
利用高偏压量子点接触进行电荷探测已成为研究少电子量子点电路最有效的探针。通过对双量子点和三量子点电路的测量，阐明了电荷传感对受限电子的反作用作用。量子点接触触发了非弹性跃迁，这是相当普遍的。在特定的设备和测量条件下，这些转变表现为稳定性图内的电报噪声的有界区域。从人工原子到分子行为的非平衡过渡被确定。量子信息应用的后果进行了讨论。
Charge detection utilizing a highly biased quantum point contact has become the most effective probe for studying few electron quantum dot circuits. Measurements on double and triple quantum dot circuits is performed to clarify a back action role of charge sensing on the confined electrons. The quantum point contact triggers inelastic transitions, which occur quite generally. Under specific device and measurement conditions these transitions manifest themselves as bounded regimes of telegraph noise within a stability diagram. A nonequilibrium transition from artificial atomic to molecular behavior is identified. Consequences for quantum information applications are discussed.