Volume 111, Number 1, July 2015
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||17 July 2015|
Measuring the coherence of charge states in undoped GaAs/AlGaAs double quantum dots with photon-assisted tunneling
1 Key Laboratory of Quantum Information, Chinese Academy of Sciences, University of Science and Technology of China - Hefei, Anhui 230026, China and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China - Hefei, Anhui 230026, China
(a) firstname.lastname@example.org (corresponding author)
Received: 21 April 2015
Accepted: 21 June 2015
Photon-assisted tunneling is used to study coherent properties of a charge qubit which is formed in an undoped GaAs/AlGaAs heterostructure. We found the charge relaxation time T1 to be around 15 ns and the inhomogeneous decoherence time to be around 330 ps at an electron temperature of 280 mK. This may be slightly better than that previously reported for doped devices, considering its temperature dependence. We discuss the role of donor fluctuation on the charge state coherence and possible ways for making improvements in the undoped devices.
PACS: 73.21.La – Quantum dots
© EPLA, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.