A major difficulty in realising a solid-state quantum computer is to reliably readout its qubit state at the end of computation. In this paper, we propose an efficient readout scheme making use of the resonance tunneling of a ballistic electron produced by a single electron pump. The resonance condition is perturbed when a charge qubit is placed nearby and consequently the transmission property of the ancillary readout electron reflects the qubit state to be measured. A fully quantum dynamical model for the readout of solid-state charge qubits is presented, which allows us to examine in detail the coherent evolution of the ancillary electron and the qubit system.
展开▼
