Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise

M. R. Delbecq, T. Nakajima, P. Stano, T. Otsuka, S. Amaha, J. Yoneda, K. Takeda, G. Allison, A. Ludwig, A. D. Wieck, S. Tarucha

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34 Citations (Scopus)

Abstract

We extract the phase coherence of a qubit defined by singlet and triplet electronic states in a gated GaAs triple quantum dot, measuring on time scales much shorter than the decorrelation time of the environmental noise. In this nonergodic regime, we observe that the coherence is boosted and several dephasing times emerge, depending on how the phase stability is extracted. We elucidate their mutual relations, and demonstrate that they reflect the noise short-time dynamics.

Original languageEnglish
Article number046802
JournalPhysical Review Letters
Volume116
Issue number4
DOIs
Publication statusPublished - 2016 Jan 26
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Delbecq, M. R., Nakajima, T., Stano, P., Otsuka, T., Amaha, S., Yoneda, J., Takeda, K., Allison, G., Ludwig, A., Wieck, A. D., & Tarucha, S. (2016). Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise. Physical Review Letters, 116(4), [046802]. https://doi.org/10.1103/PhysRevLett.116.046802