Quantum nondemolition detection with optical fibers

M. D. Levenson, Robert M. Shelby, Stephen H. Perlmutter

Κönig, Rechtenwald, Zielonka +3 more

Robert M. Shelby, M. D. Levenson

Robert M. Shelby

The concept of quantum nondemolition (QND) measurement is outlined in the context of quantum optics. As a prototypal QND measurement scheme, the interaction of a light beam with a classical mechanical oscillator via radiation pressure is outlined. Results of QND experiments using cross‐phase modulation of two co‐propagating beams in single mode optical fibers are reviewed, and the prospects for improved schemes briefly discussed.

Friedrich König, T. Rechtenwald, M. Zielonka +3 more

Summary form only given. The collision of optical pulses in a fiber is a promising concept for quantum-nondemolition (QND) measurements of the photon-number using the Kerr effect induced cross-phase modulation (XPM). Spectral filtering of solitons produced strong photon-number noise reduction below shot noise in direct detection. We present a novel QND experiment based on the XPM-induced frequency shift of colliding pulses and on direct detection using spectral filtering.

Philippe Grangier