Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 44: Quantum Information: Concepts and Methods III

Q 44.3: Talk

Thursday, March 11, 2010, 11:00–11:15, E 214

Entanglement in quantum spin chains with broken reflection symmetry — •Zoltan Zimboras and Zoltan Kadar — Quantum Information Theory Group, ISI, Torino

Understanding the entanglement properties of systems with many degrees of freedom, such as quantum spin chains, has been one of the main recent research topics connecting quantum information theory and condensed matter physics. Huge amount of results has been accumulated about translation-invariant systems. However, the results almost exclusively correspond to systems having reflection symmetry, despite that models violating reflection invariance play a prominent role in many-body theory (e.g., in describing interactions of Dzyaloshinskii-Moriya type or non-equilibrium steady states). In this talk we will present some new results, both analytical and numerical, about the entanglement properties of non-reflection-invariant spin chains, and discuss how these differ from the reflection-invariant case (e.g., we dicuss the small "violation" of the Calabrese-Cardy formula for the finite size scaling of the entanglement entropy).