Heisenberg microscope and quantum variation measurementстатья
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Аннотация:We demonstrate taking the Heisenberg microscope as an example that the standard quantum limit for registration of force can be overcome in a quantum coordinate measurement. We propose to vary the distance between the diffraction slit and detector plane during measurement so that one can measure a linear combination of coordinate and back action momentum transfered to the probe mass in accordance with the uncertainty principle. Changing the distance in a special way enables one to exclude the influence of the back action fluctuations, thus implementing the idea of a quantum variation measurement. (C) 1997 Elsevier Science B.V.