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- University of LisbonPT261 papers
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6 papers · 2 filters
Characterizing entanglement using quantum discord over state extensions
Chunhe Xiong, Sunho Kim, Daowen Qiu +2
We propose a framework to characterize entanglement with quantum discord, both asymmetric and symmetric, over state extensions. In particular, we show that the minimal Bures distan…
Operational interpretation of the vacuum and process matrices for identical particles
Ricardo Faleiro, Nikola Paunkovic, Marko Vojinovic
This work overviews the single-particle two-way communication protocol recently introduced by del Santo and Dakić (dSD), and analyses it using the process matrix formalism. We give…
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 field thermal machines
M. Gluza, J. Sabino, N. H. Y. Ng +7
Recent years have enjoyed an overwhelming interest in quantum thermodynamics, a field of research aimed at understanding thermodynamic tasks performed in the quantum regime. Furthe…
Quantum key distribution overcoming extreme noise: simultaneous subspace coding using high-dimensional entanglement
Mirdit Doda, Marcus Huber, Gláucia Murta +3
High-dimensional entanglement promises to increase the information capacity of photons and is now routinely generated exploiting spatio-temporal degrees of freedom of single photon…
A Private Quantum Bit String Commitment
Mariana Gama, Paulo Mateus, André Souto
We propose an entanglement-based quantum bit string commitment protocol whose composability is proven in the random oracle model. This protocol has the additional property of prese…