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Topic: Unsolved 3-dim Unitary Matrix Problem -- special decomposition: U
= D1 O1 X O2 D2? with Diagonals, Unitary

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Heather Meadows

Posts: 1
Registered: 8/20/11
Unsolved 3-dim Unitary Matrix Problem -- special decomposition: U
= D1 O1 X O2 D2? with Diagonals, Unitary

Posted: Aug 20, 2011 10:30 AM
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Denote U a 3-dimensional Unitary Matrix over the complex numbers.
Denote D1 and D2 as two 3-dimensional matrixes that are diagonal and
whose entries are of complex norm one.
Denote O1 and O2 as two 3-dimensional orthogonal matrices i.e. real
entries only.
Denote X as the diagonal matrix with diagonal entries (1, i, i) where
i is the imaginary unit.

Given any U, can it always written in the form U = D1 O1 X O2 D2?

There are no assumed relationships between the entries of D1, O1, O2,
and D2 they can be totally unrelated numbers. I.e. O2 need not have
any relation to O1 or its transpose or inverse or angles, etc.. Nor
need the entries of D2 in anyway relate to those of D1.

Let Y = the diagonal matrix with diagonal matrix entries (1,1,z).
Given U, I can always write it in the form D1 O1 Y O2 D2 where z has
complex norm one; but I can't figure out if there is another
decomposition of the desired form above; with totally different
matrices D1, O1, O2, D2.




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