73 citations · 150 across the 9 of their papers we have counts for
6 papers · 1 filter
Interferometric geometry from symmetry-broken Uhlmann gauge group with applications to topological phase transitions
Hector Silva, Bruno Mera, Nikola Paunković
We provide a natural generalization of a Riemannian structure, i.e., a metric, recently introduced by Sjöqvist for the space of non degenerate density matrices, to the degenerate c…
Quantum contract signing with entangled pairs
P. Yadav, P. Mateus, N. Paunković +1
We present a quantum scheme for signing contracts between two clients (Alice and Bob) using entangled states and the services of a third trusted party (Trent). The trusted party is…
Quantum key distribution by phase flipping of coherent states of light
G. A. Barbosa, J. van de Graaf, P. Mateus +1
In this paper we present quantum key distribution protocol that, instead of single qubits, uses mesoscopic coherent states of light to encode bit values of a randomly g…
Boltzmann-Gibbs states in topological quantum walks and associated many-body systems: Fidelity and Uhlmann parallel transport analysis of Phase Transitions
Bruno Mera, Chrysoula Vlachou, Nikola Paunković +1
We perform the fidelity analysis for Boltzmann-Gibbs-like states in order to investigate whether the topological order of 1D fermionic systems at zero temperature is maintained at…
Noise and measurement errors in a practical two-state quantum bit commitment protocol
Ricardo Loura, Álvaro J. Almeida, Paulo S. André +3
We present a two-state practical quantum bit commitment protocol, the security of which is based on the current technological limitations, namely the nonexistence of either stable…
Secure -dimensional Simultaneous Dense Coding and Applications
Haozhen Situ, Daowen Qiu, Paulo Mateus +1
Simultaneous dense coding guarantees that Bob and Charlie simultaneously receive their respective information from Alice in their respective processes of dense coding. The idea is…