Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-01-24
Phys. Rev. Lett 93, 056803 (2004)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 2 figures
Scientific paper
10.1103/PhysRevLett.93.056803
We develop a theory of quadratic quantum measurements by a mesoscopic detector. It is shown that quadratic measurements should have non-trivial quantum information properties, providing, for instance, a simple way of entangling two non-interacting qubits. We also calculate output spectrum of a quantum detector with both linear and quadratic response continuously monitoring coherent oscillations in two qubits.
Averin Dmitri V.
Korotkov Alexander N.
Mao Wenjin
Ruskov Rusko
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