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Journal of Mathematical Sciences

What information about a wave function is given by “measuring” it with the help of the tomographic method of recovering the Wigner distribution?

Lev B. Klebanov, L. A. Khalfin

Published Feb 1, 1999• 0 citations
Publisher
DOI
10.1007/bf02364821

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In the past few years experimenters have learned how to determine the complete quantum state of an ensemble of particles or fields which have been prepared according to some unknown procedure. Through these experiments they have answered a question posed by W. Pauli in the 1930s. The methods used involve measuring statistical distributions of a well chosen set of physical observables and using a tomographic inversion algorithm to reconstruct the Wigner function and its corresponding wave function or density matrix. Recontructions have been successfully carried out in atomic, molecular, and optical physics. The development of these procedures helps to firm up the interpretation of the Schrodinger wave function.
We have recently derived a phase space approximation for wave propagation, and we have shown that this approximation is accurate especially compared to the stationary phase approximation. The method gives an approximate Wigner distribution, which raises the question, is the approximate Wigner distribution representable? If it is, then we can invert it to obtain the corresponding wave function. If it is not, can we obtain an approximate wave function from it, and how good is the approximation? Although the answer to the first question is no, we show that from the Wigner approximation one can recover the exact spatial spectrum magnitude and derivative of the phase. We also consider other methods for obtaining approximate wave functions from the Wigner approximation.