400 citations · 2.5k across the 79 of their papers we have counts for
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quant-ph2003★ 4 cited
Geometry of decomposition dependent evolutions of mixed states
David Kult, Erik Sjöqvist
We examine evolutions where each component of a given decomposition of a mixed quantal state evolves independently in a unitary fashion. The geometric phase and parallel transport…
quant-ph2003★ 26 cited
Optimal Topological Test for Degeneracies of Real Hamiltonians
Niklas Johansson, Erik Sjöqvist
We consider adiabatic transport of eigenstates of real Hamiltonians around loops in parameter space. It is demonstrated that loops that map to nontrivial loops in the space of eige…
quant-ph2003★ 28 cited
Off-diagonal generalization of the mixed state geometric phase
Stefan Filipp, Erik Sjöqvist
The concept of off-diagonal geometric phases for mixed quantal states in unitary evolution is developed. We show that these phases arise from three basic ideas: (1) fulfillment of…