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Delbecq MR, Nakajima T, Stano P, et al. Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise. Phys Rev Lett. 2016;116(4):046802doi: 10.1103/PhysRevLett.116.046802.
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
Delbecq, M R, et al. "Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise." Physical review letters vol. 116,4 (2016): 046802. doi: https://doi.org/10.1103/PhysRevLett.116.046802
Delbecq MR, Nakajima T, Stano P, Otsuka T, Amaha S, Yoneda J, Takeda K, Allison G, Ludwig A, Wieck AD, Tarucha S. Quantum Dephasing in a Gated GaAs Triple Quantum Dot due to Nonergodic Noise. Phys Rev Lett. 2016 Jan 29;116(4):046802. doi: 10.1103/PhysRevLett.116.046802. Epub 2016 Jan 26. PMID: 26871350.
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Phys Rev Lett. 2016 Jan 29;116(4):046802. doi: 10.1103/PhysRevLett.116.046802. Epub 2016 Jan 26.

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

Physical review letters

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

Affiliations

  1. Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
  2. Institute of Physics, Slovak Academy of Sciences, 845 11 Bratislava, Slovakia.
  3. Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany.
  4. Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

PMID: 26871350 DOI: 10.1103/PhysRevLett.116.046802

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.

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