Initialization of a spin qubit in a site-controlled nanowire quantum dot

Konstantinos G Lagoudakis, Peter L McMahon, Kevin A Fischer, Shruti Puri, Kai Müller, Dan Dalacu, Philip J Poole, Michael E Reimer, Val Zwiller, Yoshihisa Yamamoto, Jelena Vučković

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A fault-tolerant quantum repeater or quantum computer using solid-state spin-based quantum bits will likely require a physical implementation with many spins arranged in a grid. Self-assembled quantum dots (QDs) have been established as attractive candidates for building spin-based quantum information processing devices, but such QDs are randomly positioned, which makes them unsuitable for constructing large-scale processors. Recent efforts have shown that QDs embedded in nanowires can be deterministically positioned in regular arrays, can store single charges, and have excellent optical properties, but so far there have been no demonstrations of spin qubit operations using nanowire QDs. Here we demonstrate optical pumping of individual spins trapped in site-controlled nanowire QDs, resulting in high-fidelity spin-qubit initialization. This represents the next step towards establishing spins in nanowire QDs as quantum memories suitable for use in a large-scale, fault-tolerant quantum computer or repeater based on all-optical control of the spin qubits.
LanguageEnglish
Article number053024
Number of pages8
JournalNew Journal of Physics
Volume18
Issue number5
DOIs
Publication statusPublished - 19 Apr 2016

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nanowires
quantum dots
repeaters
quantum computers
optical control
optical pumping
central processing units
grids
solid state
optical properties

Keywords

  • quantuim dot
  • spin qubit
  • optical pumping
  • spectroscopy

Cite this

Lagoudakis, K. G., McMahon, P. L., Fischer, K. A., Puri, S., Müller, K., Dalacu, D., ... Vučković, J. (2016). Initialization of a spin qubit in a site-controlled nanowire quantum dot. New Journal of Physics, 18(5), [053024]. https://doi.org/10.1088/1367-2630/18/5/053024
Lagoudakis, Konstantinos G ; McMahon, Peter L ; Fischer, Kevin A ; Puri, Shruti ; Müller, Kai ; Dalacu, Dan ; Poole, Philip J ; Reimer, Michael E ; Zwiller, Val ; Yamamoto, Yoshihisa ; Vučković, Jelena. / Initialization of a spin qubit in a site-controlled nanowire quantum dot. In: New Journal of Physics. 2016 ; Vol. 18, No. 5.
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Lagoudakis, KG, McMahon, PL, Fischer, KA, Puri, S, Müller, K, Dalacu, D, Poole, PJ, Reimer, ME, Zwiller, V, Yamamoto, Y & Vučković, J 2016, 'Initialization of a spin qubit in a site-controlled nanowire quantum dot' New Journal of Physics, vol. 18, no. 5, 053024. https://doi.org/10.1088/1367-2630/18/5/053024

Initialization of a spin qubit in a site-controlled nanowire quantum dot. / Lagoudakis, Konstantinos G; McMahon, Peter L; Fischer, Kevin A; Puri, Shruti; Müller, Kai; Dalacu, Dan; Poole, Philip J; Reimer, Michael E; Zwiller, Val; Yamamoto, Yoshihisa; Vučković, Jelena.

In: New Journal of Physics, Vol. 18, No. 5, 053024, 19.04.2016.

Research output: Contribution to journalArticle

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AU - Müller, Kai

AU - Dalacu, Dan

AU - Poole, Philip J

AU - Reimer, Michael E

AU - Zwiller, Val

AU - Yamamoto, Yoshihisa

AU - Vučković, Jelena

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