Limitations of variational quantum algorithms: a quantum optimal transport approach

G De Palma, M Marvian, C Rouzé, DS França - PRX Quantum, 2023 - APS
The impressive progress in quantum hardware of the last years has raised the interest of the
quantum computing community in harvesting the computational power of such devices …

Efficient learning of ground and thermal states within phases of matter

C Rouzé, D Stilck França, E Onorati… - Nature …, 2024 - nature.com
We consider two related tasks:(a) estimating a parameterisation of a given Gibbs state and
expectation values of Lipschitz observables on this state;(b) learning the expectation values …

The quantum Wasserstein distance of order 1

G De Palma, M Marvian, D Trevisan… - IEEE Transactions on …, 2021 - ieeexplore.ieee.org
We propose a generalization of the Wasserstein distance of order 1 to the quantum states of
n qudits. The proposal recovers the Hamming distance for the vectors of the canonical basis …

Geometrical bounds of the irreversibility in Markovian systems

T Van Vu, Y Hasegawa - Physical Review Letters, 2021 - APS
We derive geometrical bounds on the irreversibility in both quantum and classical Markovian
open systems that satisfy the detailed balance condition. Using information geometry, we …

Learning quantum many-body systems from a few copies

C Rouzé, DS França - Quantum, 2024 - quantum-journal.org
Estimating physical properties of quantum states from measurements is one of the most
fundamental tasks in quantum science. In this work, we identify conditions on states under …

Quantum optimal transport with quantum channels

G De Palma, D Trevisan - Annales Henri Poincaré, 2021 - Springer
We propose a new generalization to quantum states of the Wasserstein distance, which is a
fundamental distance between probability distributions given by the minimization of a …

Non-commutative calculus, optimal transport and functional inequalities in dissipative quantum systems

EA Carlen, J Maas - Journal of Statistical Physics, 2020 - Springer
We study dynamical optimal transport metrics between density matrices associated to
symmetric Dirichlet forms on finite-dimensional C^* C∗-algebras. Our setting covers …

Complete entropic inequalities for quantum Markov chains

L Gao, C Rouzé - Archive for Rational Mechanics and Analysis, 2022 - Springer
We prove that every GNS-symmetric quantum Markov semigroup on a finite dimensional
matrix algebra satisfies a modified log-Sobolev inequality. In the discrete time setting, we …

Learning quantum data with the quantum earth mover's distance

BT Kiani, G De Palma, M Marvian… - Quantum Science and …, 2022 - iopscience.iop.org
Quantifying how far the output of a learning algorithm is from its target is an essential task in
machine learning. However, in quantum settings, the loss landscapes of commonly used …

The modified logarithmic Sobolev inequality for quantum spin systems: classical and commuting nearest neighbour interactions

Á Capel, C Rouzé, DS França - arxiv preprint arxiv:2009.11817, 2020 - arxiv.org
Given a uniform, frustration-free family of local Lindbladians defined on a quantum lattice
spin system in any spatial dimension, we prove a strong exponential convergence in relative …