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Efficient Quantum Monte Carlo through Cluster Expansions
Jorge Sánchez-Segovia, Álvaro M. Alhambra
The sign problem remains a major obstacle to extending the success of Monte Carlo methods to generic quantum many-body systems. A powerful alternative relies on cluster expansions,…
Stability of thermal equilibrium in long-range quantum systems
Tim Möbus, Jorge Sánchez-Segovia, Álvaro M. Alhambra +1
Experimental realizations of spin models are irremediably prone to errors, which can propagate through the system corrupting experimental signals. We study how such errors affect t…
High-temperature partition functions and classical simulatability of long-range quantum systems
Jorge Sánchez-Segovia, Jan T. Schneider, Álvaro M. Alhambra
Long-range quantum systems, in which the interactions decay as , are of increasing interest due to the variety of experimental set-ups in which they naturally appear. Motiva…