73 citations · 316 across the 12 of their papers we have counts for
12 papers
Universally Composable Commitments with Communicating Malicious Physically Uncloneable Functions
Lourenço Abecasis, Paulo Mateus, Chrysoula Vlachou
In this work, we explore the possibility of universally composable (UC)-secure commitments using Physically Uncloneable Functions (PUFs) within a new adversarial model. We introduc…
Protocols for Quantum Weak Coin Flipping
Atul Singh Arora, Jérémie Roland, Chrysoula Vlachou +1
Weak coin flipping is an important cryptographic primitive$\unicode{x2013}$it is the strongest known secure two-party computation primitive that classically becomes secure only und…
Quantum Universally Composable Oblivious Linear Evaluation
Manuel B. Santos, Paulo Mateus, Chrysoula Vlachou
Oblivious linear evaluation is a generalization of oblivious transfer, whereby two distrustful parties obliviously compute a linear function, f (x) = ax + b, i.e., each one provide…
Quantifying fermionic interactions from the violation of Wick's theorem
Jiannis K. Pachos, Chrysoula Vlachou
In contrast to interacting systems, the ground state of free systems has a highly ordered pattern of quantum correlations, as witnessed by Wick's decomposition. Here, we quantify t…
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…
Analytic quantum weak coin flipping protocols with arbitrarily small bias
Atul Singh Arora, Jérémie Roland, Chrysoula Vlachou
Weak coin flipping (WCF) is a fundamental cryptographic primitive for two-party secure computation, where two distrustful parties need to remotely establish a shared random bit whi…
Fidelity and Uhlmann connection analysis of topological phase transitions in two dimensions
S. T. Amin, B. Mera, C. Vlachou +2
We study the behaviour of the fidelity and the Uhlmann connection in two-dimensional systems of free fermions that exhibit non-trivial topological behavior. In particular, we use t…
Dynamical phase transitions at finite temperature from fidelity and interferometric Loschmidt echo induced metrics
Bruno Mera, Chrysoula Vlachou, Nikola Paunković +2
We study finite-temperature Dynamical Quantum Phase Transitions (DQPTs) by means of the fidelity and the interferometric Loschmidt Echo (LE) induced metrics. We analyse the associa…
Quantum key distribution with quantum walks
Chrysoula Vlachou, Walter Krawec, Paulo Mateus +2
Quantum key distribution is one of the most fundamental cryptographic protocols. Quantum walks are important primitives for computing. In this paper we take advantage of the proper…
The Uhlmann connection in fermionic systems undergoing phase transitions
Bruno Mera, Chrysoula Vlachou, Nikola Paunković +1
We study the behaviour of the Uhlmann connection in systems of fermions undergoing phase transitions. In particular, we analyse some of the paradigmatic cases of topological insula…
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…
Quantum walks public key cryptographic system
C. Vlachou, J. Rodrigues, P. Mateus +2
Quantum Cryptography is a rapidly developing field of research that benefits from the properties of Quantum Mechanics in performing cryptographic tasks. Quantum walks are a powerfu…