Abstract
Techniques for making quantum-limited nonlinear measurements have attracted a great deal of recent attention because they allow a measurement sensitivity that improves as the number of measuring particles (e.g. photons) increases faster than an equivalent linear measurement. This super-Heisenberg scaling was recently demonstrated in a proof-of-principle experiment [1], in which a measurement Hamiltonian of the form studied in Ref. [2] was carefully engineered by exploiting nonlinearities in a Faraday rotation based measurement of atomic spins. However, despite the improved scaling, the absolute measurement sensitivity in this experiment remained significantly worse than a linear Faraday rotation measurement due to the weak atom-light coupling strength of the nonlinear Faraday rotation, and effect of higher-order nonlinearities at large photon number. This leaves open the question of whether it is possible to make a nonlinear measurement that both benefits from the improved scaling, and competes in absolute sensitivity with linear techniques.
© 2013 IEEE
PDF ArticleMore Like This
R. J. Sewell, M. Napolitano, N. Behbood, G. Colangelo, F. Martin Ciurana, and M. W. Mitchell
QTh1L.3 CLEO: QELS_Fundamental Science (CLEO:FS) 2013
R. J. Sewell, M. Napolitano, N. Behbood, G. Colangelo, F. Martin Ciurana, and M. W. Mitchell
QTu3B.3 Quantum Information and Measurement (QIM) 2014
R. J. Sewell, M. Koschorreck, M. Napolitano, B. Dubost, N. Behbood, and M. W. Mitchell
QF2E.2 Quantum Electronics and Laser Science Conference (CLEO:FS) 2012