The lead author of the paper, Dr. Alex Lvovsky, is now at the
University of Calgary leading the Quantum Information Technology
program whose home page is:
http://qis.ucalgary.ca/quantech/index.html
I found the site quite interesting.
The complete PDF file of the original 4 page published
scientific article from Physical Review Letters Vol. 87 Number 5,
30 July 2001 is posted at:
http://qis.ucalgary.ca/quantech/FockPRL.pdf
A slightly less technical statement is at:
http://qis.ucalgary.ca/quantech/fock.html
A tantalizing statement, "... the nonlocal single photon is one
of those rare cases in physics when the experimental work is
ahead of theoretical" is on web page:
http://qis.ucalgary.ca/quantech/nonlocality.html
I would restate that as, "Neither quantum mechanical theories
nor classical theories give adequate explanations for the
experimental data."
Is this an opportunity for someone in the RS world who can
provide a better theoretical explanation? A working knowledge
of quantum mechanical vocabulary will be required, because that
is the vocabulary of the technical papers.