56 citations · 119 across the 13 of their papers we have counts for
14 papers
Entanglement Sudden Death in Gapped Ground States
Robert Ferydouni, Thomas Jackson, Samuel O. Scalet
Spatial sudden death of entanglement refers to the disappearance of quantum correlations between subsystems after a certain distance called the entanglement length. Specifically, g…
Dissipative microcanonical ensemble preparation from KMS-detailed balance
Anirban N. Chowdhury, Samuel O. Scalet, Kunal Sharma
Stationary states of quantum many-body Hamiltonians are invariant under the Hamiltonian evolution. Besides ground and thermal states, this class includes microcanonical ensembles t…
Spatial Entanglement Sudden Death in Spin Chains at All Temperatures
Samuel O. Scalet
We prove a finite entanglement length for the Gibbs state of any local Hamiltonian on a spin chain at any finite temperature: After removing an interval of size at least equal to t…
Convergence of the Cumulant Expansion and Polynomial-Time Algorithm for Weakly Interacting Fermions
Hongrui Chen, Cambyse Rouzé, Jielun Chen +6
We propose a randomized algorithm to compute the log-partition function of weakly interacting fermions with polynomial runtime in both the system size and precision. Although weakl…
Efficient and simple Gibbs state preparation of the 2D toric code via duality to classical Ising chains
Pablo Páez-Velasco, Niclas Schilling, Samuel O. Scalet +2
We introduce the notion of polynomial-depth duality transformations, which relates two sets of operator algebras through a conjugation by a poly-depth quantum circuit, and make use…
Classical Estimation of the Free Energy and Quantum Gibbs Sampling from the Markov Entropy Decomposition
Samuel O. Scalet, Angela Capel, Anirban N. Chowdhury +4
We revisit the Markov Entropy Decomposition, a classical convex relaxation algorithm introduced by Poulin and Hastings to approximate the free energy in quantum spin lattices. We i…
Certified algorithms for quantum Hamiltonian learning via energy-entropy inequalities
Adam Artymowicz, Hamza Fawzi, Omar Fawzi +1
We consider the problem of learning the Hamiltonian of a quantum system from estimates of Gibbs-state expectation values. Various methods for achieving this task were proposed rece…
Tensor Network Python (TeNPy) version 1
Johannes Hauschild, Jakob Unfried, Sajant Anand +27
TeNPy (short for 'Tensor Network Python') is a python library for the simulation of strongly correlated quantum systems with tensor networks. The philosophy of this library is to a…
A Faster Algorithm for the Free Energy in One-Dimensional Quantum Systems
Samuel O. Scalet
We consider the problem of approximating the free energy density of a translation-invariant, one-dimensional quantum spin system with finite range. While the complexity of this pro…
Conditional Independence of 1D Gibbs States with Applications to Efficient Learning
Álvaro M. Alhambra, Ángela Capel, Paul Gondolf +2
We show that spin chains in thermal equilibrium have a correlation structure in which individual regions are strongly correlated at most with their near vicinity. We quantify this…
Certified algorithms for equilibrium states of local quantum Hamiltonians
Hamza Fawzi, Omar Fawzi, Samuel O. Scalet
Predicting observables in equilibrium states is a central yet notoriously hard question in quantum many-body systems. In the physically relevant thermodynamic limit, certain mathem…
Entropy Constraints for Ground Energy Optimization
Hamza Fawzi, Omar Fawzi, Samuel O. Scalet
We study the use of von Neumann entropy constraints for obtaining lower bounds on the ground energy of quantum many-body systems. Known methods for obtaining certificates on the gr…
A subpolynomial-time algorithm for the free energy of one-dimensional quantum systems in the thermodynamic limit
Hamza Fawzi, Omar Fawzi, Samuel O. Scalet
We introduce a classical algorithm to approximate the free energy of local, translation-invariant, one-dimensional quantum systems in the thermodynamic limit of infinite chain size…
Computable Rényi mutual information: Area laws and correlations
Samuel O. Scalet, Álvaro M. Alhambra, Georgios Styliaris +1
The mutual information is a measure of classical and quantum correlations of great interest in quantum information. It is also relevant in quantum many-body physics, by virtue of s…