2 papers
math.OA2014
Regularity for braided multiplicative unitaries
David Buecher, Sutanu Roy
We generalise the notions of semi-regularity, regularity, and bi-regularity to unitary solutions of the braided Pentagon equation in concrete W*-categories with semi-regular/regula…
math-ph2014
Invariant states of quantum birth and death chains
David Buecher
A sufficient condition is given for a class of quantum birth and death chains on the non-negative integers to possess invariant states. The result is applied to generalised one-ato…