601 citations · 1.3k across the 34 of their papers we have counts for
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quant-ph2002★ 25 cited
Uhlmann's geometric phase in presence of isotropic decoherence
Jonas Tidström, Erik Sjöqvist
Uhlmann's mixed state geometric phase [Rep. Math. Phys. {\bf 24}, 229 (1986)] is analyzed in the case of a qubit affected by isotropic decoherence treated in the Markovian approxim…
quant-ph2002★ 1 cited
Pancharatnam revisited
Erik Sjöqvist
Some recent ideas concerning Pancharatnam's prescription of relative phase between quantal states are delineated. Generalisations to mixed states and entangled two-photon states ar…