51 citations · 189 across the 9 of their papers we have counts for
9 papers
Holonomy for Quantum Channels
David Kult, Johan Åberg, Erik Sjöqvist
A quantum holonomy reflects the curvature of some underlying structure of quantum mechanical systems, such as that associated with quantum states. Here, we extend the notion of hol…
Nodal free geometric phases: Concept and application to geometric quantum computation
Marie Ericsson, David Kult, Erik Sjöqvist +1
Nodal free geometric phases are the eigenvalues of the final member of a parallel transporting family of unitary operators. These phases are gauge invariant, always well-defined, a…
Non-Abelian generalization of off-diagonal geometric phases
David Kult, Johan Åberg, Erik Sjöqvist
If a quantum system evolves in a noncyclic fashion the corresponding geometric phase or holonomy may not be fully defined. Off-diagonal geometric phases have been developed to deal…
Operational approach to the Uhlmann holonomy
Johan Aberg, David Kult, Erik Sjöqvist +1
We suggest a physical interpretation of the Uhlmann amplitude of a density operator. Given this interpretation we propose an operational approach to obtain the Uhlmann condition fo…
Manifestations of quantum holonomy in interferometry
Erik Sjöqvist, David Kult, Johan Åberg
Abelian and non-Abelian geometric phases, known as quantum holonomies, have attracted considerable attention in the past. Here, we show that it is possible to associate nonequivale…
Noncyclic geometric changes of quantum states
David Kult, Johan Åberg, Erik Sjöqvist
Non-Abelian quantum holonomies, i.e., unitary state changes solely induced by geometric properties of a quantum system, have been much under focus in the physics community as gener…