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Phys Rev Lett. 2012 Sep 7;109(10):100404. Epub 2012 Sep 6.

Violation of Heisenberg's measurement-disturbance relationship by weak measurements.

Author information

1
Centre for Quantum Information & Quantum Control and Institute for Optical Sciences, Department of Physics, University of Toronto, Toronto, Ontario, Canada.

Erratum in

  • Phys Rev Lett. 2012 Nov 2;109(18):189902.

Abstract

While there is a rigorously proven relationship about uncertainties intrinsic to any quantum system, often referred to as "Heisenberg's uncertainty principle," Heisenberg originally formulated his ideas in terms of a relationship between the precision of a measurement and the disturbance it must create. Although this latter relationship is not rigorously proven, it is commonly believed (and taught) as an aspect of the broader uncertainty principle. Here, we experimentally observe a violation of Heisenberg's "measurement-disturbance relationship", using weak measurements to characterize a quantum system before and after it interacts with a measurement apparatus. Our experiment implements a 2010 proposal of Lund and Wiseman to confirm a revised measurement-disturbance relationship derived by Ozawa in 2003. Its results have broad implications for the foundations of quantum mechanics and for practical issues in quantum measurement.

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