Long-distance coherent coupling in a quantum dot array

被引：0
作者：
Braakman F.R. [1 ]
Barthelemy P. [1 ]
Reichl C. [2 ]
Wegscheider W. [2 ]
Vandersypen L.M.K. [1 ]
机构：
[1] Kavli Institute of Nanoscience, TU Delft
[2] Solid State Physics Laboratory, ETH Zürich
来源：
Nature Nanotechnology | 2013年 / 8卷 / 6期
关键词：
D O I：
10.1038/nnano.2013.67
中图分类号：
学科分类号：
摘要：
Controlling long-distance quantum correlations is central to quantum computation and simulation. In quantum dot arrays, experiments so far rely on nearest-neighbour couplings only, and inducing long-distance correlations requires sequential local operations. Here, we show that two distant sites can be tunnel-coupled directly. The coupling is mediated by virtual occupation of an intermediate site, with a strength that is controlled via the energy detuning of this site. It permits a single charge to oscillate coherently between the outer sites of a triple dot array without passing through the middle, as demonstrated through the observation of Landau-Zener-Stückelberg interference. The long-distance coupling significantly improves the prospects of fault-tolerant quantum computation using quantum dot arrays, and opens up new avenues for performing quantum simulations in nanoscale devices. © 2013 Macmillan Publishers Limited. All rights reserved.
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页码：432 / 437
页数：5
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