TY - JOUR
T1 - Manipulating quantum coherence of charge states in interacting double-dot Aharonov-Bohm interferometers
AU - Jin, Jinshuang
AU - Wang, Shikuan
AU - Zhou, Jiahuan
AU - Zhang, Wei Min
AU - Yan, Yijing
N1 - Funding Information:
Support from the Natural Science Foundation of China (Nos. 11675048, 11447006 & 21633006), the Ministry of Science and Technology of China (No. 2016YFA0400904), and the MST of Taiwan (No. MST-105-2112-M-006-008-MY3) is gratefully acknowledged.
Publisher Copyright:
© 2018 The Author(s). Published by IOP Publishing Ltd on behalf of Deutsche Physikalische Gesellschaft.
PY - 2018/4
Y1 - 2018/4
N2 - We investigate the dynamics of charge-state coherence in a degenerate double-dot Aharonov-Bohm interferometer with finite inter-dot Coulomb interactions. The quantum coherence of the charge states is found to be sensitive to the transport setup configurations, involving both the single-electron impurity channels and the Coulomb-assisted ones. We numerically demonstrate the emergence of a complete coherence between the two charge states, with the relative phase being continuously controllable through the magnetic flux. Interestingly, a fully coherent charge qubit arises at the double-dots electron pair tunneling resonance condition, where the chemical potential of one electrode is tuned at the center between a single-electron impurity channel and the related Coulomb-assisted channel. This pure quantum state of charge qubit could be experimentally realized at the current-voltage characteristic turnover position, where differential conductance sign changes. We further elaborate the underlying mechanism for both the real-time and the stationary charge-states coherence in the double-dot systems of study.
AB - We investigate the dynamics of charge-state coherence in a degenerate double-dot Aharonov-Bohm interferometer with finite inter-dot Coulomb interactions. The quantum coherence of the charge states is found to be sensitive to the transport setup configurations, involving both the single-electron impurity channels and the Coulomb-assisted ones. We numerically demonstrate the emergence of a complete coherence between the two charge states, with the relative phase being continuously controllable through the magnetic flux. Interestingly, a fully coherent charge qubit arises at the double-dots electron pair tunneling resonance condition, where the chemical potential of one electrode is tuned at the center between a single-electron impurity channel and the related Coulomb-assisted channel. This pure quantum state of charge qubit could be experimentally realized at the current-voltage characteristic turnover position, where differential conductance sign changes. We further elaborate the underlying mechanism for both the real-time and the stationary charge-states coherence in the double-dot systems of study.
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U2 - 10.1088/1367-2630/aab5cb
DO - 10.1088/1367-2630/aab5cb
M3 - Article
AN - SCOPUS:85046686401
VL - 20
JO - New Journal of Physics
JF - New Journal of Physics
SN - 1367-2630
IS - 4
M1 - 043043
ER -