期刊
NATURE NANOTECHNOLOGY
卷 8, 期 4, 页码 261-265出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2013.7
关键词
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资金
- Spanish Ministry of Education [MAT2011-24331, MEC]
- Marie Curie Initial Training Network [234970, EU]
- Consejo Superior de Investigaciones Cientificas through the JAE and JAE-Doc programmes
- Fondo Social Europeo
- National Research Council Canada - Centre national de la recherche scientifique collaboration
- Canadian Institute for Advanced Research
- Natural Sciences and Engineering Research Council of Canada
Spin qubits based on interacting spins in double quantum dots have been demonstrated successfully(1,2). Readout of the qubit state involves a conversion of spin to charge information, which is universally achieved by taking advantage of a spin blockade phenomenon resulting from Pauli's exclusion principle. The archetypal spin blockade transport signature in double quantum dots takes the form of a rectified current(3). At present, more complex spin qubit circuits including triple quantum dots are being developed(4). Here we show, both experimentally and theoretically, that in a linear triple quantum dot circuit the spin blockade becomes bipolar(5) with current strongly suppressed in both bias directions and also that a new quantum coherent mechanism becomes relevant. In this mechanism, charge is transferred non-intuitively via coherent states from one end of the linear triple dot circuit to the other, without involving the centre site. Our results have implications for future complex nano-spintronic circuits.
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