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Phys. Rev. A 65, 011803 (2001) [4 pages]

Squeezing more from a quantum nondemolition measurement

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Ben C. Buchler *, Ping Koy Lam, and Hans-A. Bachor
Department of Physics, Faculty of Science, Australian National University, ACT 0200, Australia

Ulrik L. Andersen
Department of Physics, Faculty of Science, Australian National University, ACT 0200, Australia
Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark

Timothy C. Ralph
Department of Physics, University of Queensland, Queensland 4072, Australia

Rapid Communication Received 29 August 2001; published 13 December 2001

We use a stable, 5 dB, amplitude squeezed source for a quantum nondemolition (QND) experiment. The performance of our QND system is enhanced by an electro-optic feedforward loop which improves the signal transfer efficiency. At best, we measure a total signal transfer of 1.81 and conditional variance of 0.55.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRA/v65/e011803
DOI: 10.1103/PhysRevA.65.011803
PACS: 42.50.Lc, 03.67.Hk, 42.50.Dv

* Electronic address: ben.buchler@anu.edu.au

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