Quantum limits, nonseparable transformations, and nonlinear optics

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We examine the relationship between nonseparable transformations and nonlinear optical processes, surpassing the Heisenberg limit in precision measurements.
©2007 The American Physical Society. This work has been supported by Project No. PR1-A/07-15378 of the Universidad Complutense. I thank the anonymous referees for comments that have helped me to improve the paper.
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