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Medford J, Beil J, Taylor JM, et al. Self-consistent measurement and state tomography of an exchange-only spin qubit. Nat Nanotechnol. 2013;8(9):654-9doi: 10.1038/nnano.2013.168.
Medford, J., Beil, J., Taylor, J. M., Bartlett, S. D., Doherty, A. C., Rashba, E. I., DiVincenzo, D. P., Lu, H., Gossard, A. C., & Marcus, C. M. (2013). Self-consistent measurement and state tomography of an exchange-only spin qubit. Nature nanotechnology, 8(9), 654-9. https://doi.org/10.1038/nnano.2013.168
Medford, J, et al. "Self-consistent measurement and state tomography of an exchange-only spin qubit." Nature nanotechnology vol. 8,9 (2013): 654-9. doi: https://doi.org/10.1038/nnano.2013.168
Medford J, Beil J, Taylor JM, Bartlett SD, Doherty AC, Rashba EI, DiVincenzo DP, Lu H, Gossard AC, Marcus CM. Self-consistent measurement and state tomography of an exchange-only spin qubit. Nat Nanotechnol. 2013 Sep;8(9):654-9. doi: 10.1038/nnano.2013.168. Epub 2013 Sep 01. PMID: 23995458.
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Nat Nanotechnol. 2013 Sep;8(9):654-9. doi: 10.1038/nnano.2013.168. Epub 2013 Sep 01.

Self-consistent measurement and state tomography of an exchange-only spin qubit.

Nature nanotechnology

J Medford, J Beil, J M Taylor, S D Bartlett, A C Doherty, E I Rashba, D P DiVincenzo, H Lu, A C Gossard, C M Marcus

Affiliations

  1. Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

PMID: 23995458 DOI: 10.1038/nnano.2013.168

Abstract

Quantum-dot spin qubits characteristically use oscillating magnetic or electric fields, or quasi-static Zeeman field gradients, to realize full qubit control. For the case of three confined electrons, exchange interaction between two pairs allows qubit rotation around two axes, hence full control, using only electrostatic gates. Here, we report initialization, full control, and single-shot readout of a three-electron exchange-driven spin qubit. Control via the exchange interaction is fast, yielding a demonstrated 75 qubit rotations in less than 2 ns. Measurement and state tomography are performed using a maximum-likelihood estimator method, allowing decoherence, leakage out of the qubit state space, and measurement fidelity to be quantified. The methods developed here are generally applicable to systems with state leakage, noisy measurements and non-orthogonal control axes.

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