2013/03/05 by Floris R. Braakman, Floris Braakman, Pierre Barthelemy +5 · 156 citations
Computer Science · Physics and Astronomy · #Channel (broadcasting) #Charge (physics) #Computer science #Coupling (piping) #Interference (communication) #Materials science #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum dot #Quantum mechanics #Semiconductor Quantum Structures and Devices #Telecommunications #cond-mat.mes-hall
paper · pdf · doi:10.1038/nnano.2013.67
published in Nature Nanotechnology 8(6), 432-437 (Nature Portfolio)
arxiv created 2013/03/05 · openalex publication_date 2013/04/28 · arxiv updated 2016/04/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Controlling long-range 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-range 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-range 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.