Measurement of two-qubit states by quantum point contacts

Details Measurement of two-qubit states by quantum point contacts Measurement of two-qubit states by quantum point contacts

2003-10-14

arxiv.org/abs/cond-mat/0310293v2

J. Phys.: Condens. Matter 17 (2005) 6895

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 8 figures. Full paper is prepared

Scientific paper

We solve the master equations of two charged qubits measured by two serially coupled quantum point contacts (QPCs). We describe two-qubit dynamics by comparing entangled states with product states, and show that the QPC current can be used for reading out results of quantum calculations and providing evidences of two-qubit entanglement. We also calculate the concurrence of the two qubits as a function of dephasing rate that originates from the measurement. We conclude that coupled charge qubits can be effectively detected by a QPC-based detector.

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