Scientific Reports (Jul 2017)

Macroscopic Singlet-Triplet Qubit in Synthetic Spin-One Chain in Semiconductor Nanowires

  • Blazej Jaworowski,
  • Nick Rogers,
  • Marek Grabowski,
  • Pawel Hawrylak

DOI
https://doi.org/10.1038/s41598-017-05655-9
Journal volume & issue
Vol. 7, no. 1
pp. 1 – 6

Abstract

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Abstract We show here how to create macroscopic quantum states in a semiconductor device: a chain of InAs quantum dots embedded in an InP nanowire. Filling the nanowire with 4 electrons per dot creates a synthetic spin-one chain, with four-fold degenerate topological ground state protected by a Haldane gap. The four states correspond to two spin-½ quasiparticles localised at the ends of the macroscopic wire. The quasiparticle spins are mapped onto a robust, macroscopic, singlet-triplet qubit. These predictions are supported by a microscopic theory and extensive numerical simulations.