corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 93 » Issue 5
< Previous Article | Next Article >

Phys. Rev. Lett. 93, 056803 (2004) [4 pages]

Mesoscopic Quadratic Quantum Measurements

Download: PDF (122 kB) Buy this article Export: BibTeX or EndNote (RIS)

Wenjin Mao and Dmitri V. Averin
Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3800, USA

Rusko Ruskov* and Alexander N. Korotkov
Department of Electrical Engineering, University of California, Riverside, California 92521-0204, USA

Received 24 January 2004; published 29 July 2004

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.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.056803
DOI:
10.1103/PhysRevLett.93.056803
PACS:
73.23.–b, 03.65.Ta, 03.67.Lx

*On leave from INRNE, Sofia BG-1784, Bulgaria.

 
< Previous Article | Next Article >