The discrete sampling variation measurement

The modification of the variation quantum measurement is considered, which allows to eliminate the main shortcoming of such a measurement - the meter hardware setup dependence on the signal shape and arrival time. This method is based on approximation of the signal by series of short rectangular "sl ices" and periodical applying the Variation measurement procedure fitted to such a rectangular pulse. It allows to reconstruct the signal shape with p recision not limited by the standard quantum limit. "Price", in the case of the parametric position meters (including interferometric ones), is pumpin g energy 720/pi (4) approximate to 7.4 times higher than for the usual vari ation measurement. (C) 2000 Elsevier Science B.V. All rights reserved.