Quadratic Quantum Measurements
arXiv:cond-mat/0401484 · doi:10.1103/PhysRevLett.93.056803
Abstract
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.
5 pages, 2 figures
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