Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise
Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise
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DOI：
10.1103/physrevlett.116.046802
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发表时间：
2016-01-26
影响因子：
8.6
通讯作者：
Tarucha, S.
中科院分区：
文献类型：
--
作者：
Delbecq, M. R.;Nakajima, T.;Tarucha, S.
我们提取的相位相干性量子比特定义的单重态和三重态的电子状态在门控GaAs三重量子点，测量的时间尺度远短于环境噪声的去相关时间。在这个非遍历制度，我们观察到的相干性提高和几个失相时间出现，这取决于如何提取相位稳定性。我们阐明了它们之间的相互关系，并证明它们反映了噪声的短时动态。
We extract the phase coherence of a qubit defined by singlet and triplet electronic states in a gated GaAs triple quantum dot, measuring on time scales much shorter than the decorrelation time of the environmental noise. In this nonergodic regime, we observe that the coherence is boosted and several dephasing times emerge, depending on how the phase stability is extracted. We elucidate their mutual relations, and demonstrate that they reflect the noise short-time dynamics.