Interlaced Dynamical Decoupling and Coherent Operation of a Singlet-Triplet Qubit

Details Interlaced Dynamical Decoupling and Coherent Operation of a Singlet-Triplet Qubit Interlaced Dynamical Decoupling and Coherent Operation of a Singlet-Triplet Qubit

2010-07-24

arxiv.org/abs/1007.4255v3

Phys. Rev. Lett. 105 266808 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related papers at http://marcuslab.harvard.edu

Scientific paper

We experimentally demonstrate coherence recovery of singlet-triplet superpositions by interlacing qubit rotations between Carr-Purcell (CP) echo sequences. We then compare performance of Hahn, CP, concatenated dynamical decoupling (CDD) and Uhrig dynamical decoupling (UDD) 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 T2 ~ 80 microseconds.

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