Journal
PHYSICS LETTERS A
Volume 329, Issue 1-2, Pages 8-13Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2004.06.080
Keywords
quantum limits; nonclassical states; precision measurements
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We show that nonlinear transformations provide better resolution than linear transformations for the detection of small signals. We show that the uncertainty decreases for increasing photon number faster than the rate established by the Heisenberg limit for phase shifts and displacements. (C) 2004 Elsevier B.V. All rights reserved.
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