Title :
Coherent charge oscillation in a semiconductor double quantum dot
Author :
Hayashi, Toshiaki ; Fujisawa, Toshimasa ; Cheong, H.D. ; Jeong, Y.H. ; Hirayama, Y.
Author_Institution :
Basic Res. Labs., Nippon Telephone & Telegraph Corp., Kanagawa, Japan
fDate :
6/1/2004 12:00:00 AM
Abstract :
The time evolution of a pulse-excited charge qubit in a semiconductor double quantum dot is investigated. All-electrical initialization and coherent gate control of the system are achieved, and coherent charge oscillation is observed through the transport measurements. The oscillation frequency and decoherence time T2 are estimated by fitting the transport data with a simple model. Possible decoherence mechanisms in a charge qubit system are pointed out and discussed in detail.
Keywords :
Coulomb blockade; electron-phonon interactions; semiconductor quantum dots; coherent charge oscillation; decoherence mechanisms; pulse-excited charge qubit; semiconductor double quantum dot; transport measurements; Current measurement; Electrodes; Electrons; Frequency estimation; Microscopy; Quantum computing; Quantum dots; Tunneling; US Department of Transportation; Voltage control; Charge qubit; QD; decoherence; double quantum dot;
Journal_Title :
Nanotechnology, IEEE Transactions on
DOI :
10.1109/TNANO.2004.828551
