Taylor, J.
, Jim, M.
, Beil, J.
, Bartlett, S.
, Doherty, A.
, Rashba, E.
, DiVincenzo, D.
, Lu, H.
and Gossard, A.
(2013),
State and Measurement Tomography of an Exchange-Only Spin Qubit, Nature Nanotechnology, [online], https://doi.org/10.1038/nnano.2013.168
(Accessed April 20, 2024)
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State and Measurement Tomography of an Exchange-Only Spin Qubit
Published
Author(s)
, Medford Jim, Johannes Beil, Stephen Bartlett, Andrew Doherty, Emmanuel Rashba, David P. DiVincenzo, H Lu, A. C. Gossard
Abstract
We demonstrate the initialization, full electrical control, and state tomography of an exchange- only spin qubit in a GaAs heterostructure. Decoherence and leakage from the qubit subspace are accounted for with a model of charge noise and fluctuating Overhauser fields. The linear triple quantum dot structure allows for the initialization of multiple high-fidelity input states, which are used with a Maximum Likelihood Estimation (MLE) technique to systematically characterize the generalized measurements in a demonstration of measurement tomography. This technique resulted in an average measurement fidelity of 75% and an average visibility of 49%.Citation
Nature Nanotechnology
Pub Type
Journals
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Keywords
Quantum dots, quantum computing
Citation
Created September 1, 2013, Updated November 10, 2018