Local Convertibility in quantum spin systems

• URL: http://arxiv.org/abs/2201.10625v2
• Date: Fri, 12 Aug 2022 13:47:32 GMT
• Title: Local Convertibility in quantum spin systems
• Authors: Luigi Amico, Vladimir Korepin, Alioscia Hamma, Salvatore Marco Giampaolo, Fabio Franchini
• Abstract summary: We argue that a lack of differential local convertibility (dLC) signals a higher computational power of the system's quantum phase. We argue that states with finite order parameters must be the most classical ones and thus be locally convertible.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Local Convertibility refers to the possibility of transforming a given state into a target one, just by means of LOCC with respect to a given bipartition of the system and it is possible if and only if all the Renyi-entropies of the initial state are smaller than those of the target state. We apply this concept to adiabatic evolutions and ask whether they can be rendered through LOCC in the sense above. We argue that a lack of differential local convertibility (dLC) signals a higher computational power of the system's quantum phase, which is also usually connected with the existence of long-range entanglement, topological order, or edge-states. Remarkably, dLC can detect these global properties already by considering small subsystems. Moreover, we connect dLC to spontaneous symmetry breaking by arguing that states with finite order parameters must be the most classical ones and thus be locally convertible.

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