A model for measurement of the states in a coupled-dot qubit

H B Sun, H M Wiseman
2009 Journal of Physics: Condensed Matter  
We propose a quantum trajectory analysis of a scheme to measure the states of a coupled dot device (qubit) where there is a fluctuating energy gap Δ between the two states. The system consists of the qubit and a readout dot coupled to source and drain leads. The tunnel rate through the detector is conditioned by the occupation number of the nearer quantum dot (target) of the qubit and therefore probes the states of the qubit. We derive a Lindblad-form master equation to calculate the
more » ... late the unconditional evolution of the qubit and a conditional stochastic master equation calculating the conditional evolution for different tunneling rates. The results show the effects of various device parameters and provide the optimum selection and combination of the system structure.
doi:10.1088/0953-8984/21/12/125301 pmid:21817461 fatcat:svbwularznabhlsgkplnomlg74