Mesoscopic quadratic quantum measurements.
We develop a theory of quadratic quantum measurements by a mesoscopic detector. It is shown that the quadratic measurements should have nontrivial quantum information properties, providing, for instance, a simple way of entangling two noninteracting qubits. We also calculate the output spectrum of a detector with both linear and quadratic response, continuously monitoring two qubits.
Department of Physics and Astronomy, Stony Brook University, State University of New York, Stony Brook, NY 11794-3800, USA.
Wenjin
W
Mao
Dmitri V
DV
Averin
Rusko
R
Ruskov
Alexander N
AN
Korotkov