Interlaced dynamical decoupling and coherent operation of a singlet-triplet qubit

Interlaced dynamical decoupling and coherent operation of a singlet-triplet qubit

We experimentally demonstrate coherence recovery of singlet-triplet superpositions by interlacing qubit rotations between Carr-Purcell (CP) echo sequences. We then compare the performance of Hahn, CP, concatenated dynamical decoupling (CDD), and Uhrig dynamical decoupling for singlet recovery. In th...

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Bibliographic Details
Published in:Physical review letters Vol. 105; no. 26; p. 266808
Main Authors: Barthel, C, Medford, J, Marcus, C M, Hanson, M P, Gossard, A C
Format: Journal Article
Language:English
Published: United States 30-12-2010
Online Access:Get full text
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Summary:We experimentally demonstrate coherence recovery of singlet-triplet superpositions by interlacing qubit rotations between Carr-Purcell (CP) echo sequences. We then compare the performance of Hahn, CP, concatenated dynamical decoupling (CDD), and Uhrig dynamical decoupling for singlet recovery. In the present case, where gate noise and drift combined with spatially varying hyperfine coupling contribute significantly to dephasing, and pulses have limited bandwidth, CP and CDD yield comparable results, with T(2)∼80 μs.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.105.266808