The (seldomly quoted) generalised-Heisenberg uncertainty relations are an effect of the quantum correlation coefficient inequalities. The quantum correlation coefficient determines how much a state can be compacted and on what basis. It is shown that how this can be used to best compress a signal (such as a radio wave, or a 2D laser complex field at a focal plane) while at the same time encrypting the signal.
 W. H. Press, B. P. Flannery, S. A. Teukolsky and W. T. Vetterling, “Correlation and Autocorrelation Using the FFT,” In: W. H. Press, S. A. Teukolsky, W. T. Vetterling and B. P. Flannery, Eds., Numerical Recipes in FORTRAN: The Art of Scientific Computing, 2nd Edition, Cambridge University Press, Cambridge, 1992, p. 538.
 G. Arfken, “Development of the Fourier Integral, Fourier Transforms—Inversion Theorem, and Fourier Transform of Derivatives,” In: Mathematical Methods for Physicists, 3rd Edition, Academic Press, Orlando, 1985, p. 794.