Title :
Measurement of the states of a coupled dot device
Author :
Sun, H.B. ; Wiseman, H.M. ; Utami, D.W. ; Milburn, G.J.
Author_Institution :
Dept. of Phys., Queensland Univ., St. Lucia, Qld., Australia
Abstract :
We analyse a method to measure the states of a coupled dot device (qubit). We derive a master equation to describe the unconditional evolution of the qubit when the measured records are averaged over and a conditional stochastic master equation describing the conditional evolution of the qubit. The approach is also extended to model a measurement scheme when there is a fluctuating energy gap between two electron states. From the calculated results the relevant device parameters can be estimated and optimum combination of the parameters can be selected.
Keywords :
electronic structure; energy gap; mesoscopic systems; quantum computing; semiconductor quantum dots; conditional evolution; coupled dot device; fluctuating energy gap; master equation; mesoscopic electronic systems; qubit; Australia; Electrons; Energy measurement; Equations; Physics computing; Quantum computing; Quantum dots; Stochastic processes; Tunneling; US Department of Transportation;
Conference_Titel :
Optoelectronic and Microelectronic Materials and Devices, 2000. COMMAD 2000. Proceedings Conference on
Print_ISBN :
0-7803-6698-0
DOI :
10.1109/COMMAD.2000.1022904