150 citations · 268 across the 4 of their papers we have counts for
6 papers
Fidelity Between Partial States as Signature of Quantum Phase Transitions
N. Paunkovic, P. D. Sacramento, P. Nogueira +2
We introduce a partial state fidelity approach to quantum phase transitions. We consider a superconducting lattice with a magnetic impurity inserted at its centre, and look at the…
Macroscopic Distinguishability Between Quantum States Defining Different Phases of Matter: Fidelity and the Uhlmann Geometric Phase
Nikola Paunkovic, Vitor Rocha Vieira
We study the fidelity approach to quantum phase transitions (QPTs) and apply it to general thermal phase transitions (PTs). We analyze two particular cases: the Stoner-Hubbard itin…
Ground state overlap and quantum phase transitions
Paolo Zanardi, Nikola Paunković
We present a characterization of quantum phase transitions in terms of the the overlap function between two ground states obtained for two different values of external parameters.…
Entanglement-assisted Orientation in Space
Caslav Brukner, Nikola Paunkovic, Terry Rudolph +1
We demonstrate that quantum entanglement can help separated individuals in making decisions if their goal is to find each other in the absence of any communication between them. We…
Quantum Walk on a Line with Two Entangled Particles
Y. Omar, N. Paunkovic, L. Sheridan +1
We introduce the concept of a quantum walk with two particles and study it for the case of a discrete time walk on a line. A quantum walk with more than one particle may contain en…
Optimal State Discrimination Using Particle Statistics
S. Bose, A. Ekert, Y. Omar +2
We present an application of particle statistics to the problem of optimal ambiguous discrimination of quantum states. The states to be discriminated are encoded in the internal de…