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Single-spin CCD
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DOI：10.1038/NNANO.2015.291.png)
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Abstract
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Spin-based electronics or spintronics relies on the ability to store, transport and manipulate electron spin polarization with great precision(1-4). In its ultimate limit, information is stored in the spin state of a single electron, at which point quantum information processing also becomes a possibility(5,6). Here, we demonstrate the manipulation, transport and readout of individual electron spins in a linear array of three semiconductor quantum dots. First, we demonstrate single-shot readout of three spins with fidelities of 97% on average, using an approach analogous to the operation of a charge-coupled device (CCD)(7). Next, we perform site-selective control of the three spins, thereby writing the content of each pixel of this 'single-spin charge-coupled device'. Finally, we show that shuttling an electron back and forth in the array hundreds of times, covering a cumulative distance of 80 mu m, has negligible influence on its spin projection. Extrapolating these results to the case of much larger arrays points at a diverse range of potential applications, from quantum information to imaging and sensing.
Keywords:
QUANTUM-DOT
ELECTRON-SPIN
ARCHITECTURE
SPINTRONICS
TRANSPORT
DEVICES
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