Measurement of Backaction from Electron Spins in a Gate-Defined GaAs Double Quantum dot Coupled to a Mesoscopic Nuclear Spin Bath.
Measurement of Backaction from Electron Spins in a Gate-Defined GaAs Double Quantum dot Coupled to a Mesoscopic Nuclear Spin Bath.
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耦合到介观核旋转浴的门定义 GaAs 双量子点中电子自旋反作用的测量
DOI：
10.1103/physrevlett.125.047701
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发表时间：
--
影响因子：
8.6
通讯作者：
Hendrik Bluhm
中科院分区：
文献类型：
--
作者：
Patrick Bethke;Robert P. G. McNeil;Julian Ritzmann;Tim Botzem;Arne Ludwig;Andreas D. Wieck;Hendrik Bluhm
量子系统与环境相互作用产生的退相干是理解量子世界和经典世界之间的转换以及量子技术应用中的性能限制的一个关键概念。大的、弱耦合环境的影响通常被描述为一个经典的、起伏的场，其动力学不受量子比特的影响，而完全的量子描述仍然意味着量子比特对环境的一些反向作用。在这里，我们给出了直接的实验证据，证明了在有序核自旋的介观环境中耦合的GaAs量子点中的电子自旋量子比特存在这样的反作用。通过相关测量技术，我们检测到了单个量子比特与环境相互作用的反向作用，其持续时间与量子比特的相干时间相当，即使在如此大的系统中也是如此。我们反复地让量子比特与自旋浴相互作用，并测量其状态。在这样的周期之间，量子比特被重新初始化为不同的状态。测量结果的关联受到中间量子比特态的强烈影响，它揭示了单电子自旋对核自旋的作用。
Decoherence of a quantum system arising from its interaction with an environment is a key concept for understanding the transition between the quantum and classical world as well as performance limitations in quantum technology applications. The effects of large, weakly coupled environments are often described as a classical, fluctuating field whose dynamics is unaffected by the qubit, whereas a fully quantum description still implies some backaction from the qubit on the environment. Here we show direct experimental evidence for such a backaction for an electron-spin qubit in a GaAs quantum dot coupled to a mesoscopic environment of ordernuclear spins. By means of a correlation measurement technique, we detect the backaction of a single qubit-environment interaction whose duration is comparable to the qubit’s coherence time, even in such a large system. We repeatedly let the qubit interact with the spin bath and measure its state. Between such cycles, the qubit is reinitialized to different states. The correlations of the measurement outcomes are strongly affected by the intermediate qubit state, which reveals the action of a single electron spin on the nuclear spins.
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影响因子：
16.6
作者：
Botzem T;McNeil RP;Mol JM;Schuh D;Bougeard D;Bluhm H
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影响因子：
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作者：
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