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Classical Spin Models with Broken Continuous Symmetry: Random Field Induced Order and Persistence of Spontaneous Magnetization
Aditi Sen De, Ujjwal Sen, Jan Wehr +1
We consider a classical spin model, of two-dimensional spins, with continuous symmetry, and investigate the effect of a symmetry breaking unidirectional quenched disorder on the ma…
Ultracold atomic gas in non-Abelian "magnetic" fields: the quantum Hall effect supremacy
N. Goldman, A. Kubasiak, P. Gaspard +1
Nowadays it is experimentally feasible to create artificial, and in particular, non-Abelian gauge potentials for ultracold atoms trapped in optical lattices. Motivated by this fact…
Dipolar interaction in ultra-cold atomic gases
C. Menotti, M. Lewenstein, T. Lahaye +1
Ultra-cold atomic systems provide a new setting where to investigate the role of long-range interactions. In this paper we will review the basics features of those physical systems…
Ultra-cold dipolar gases
Chiara Menotti, Maciej Lewenstein
We present a concise review of the physics of ultra-cold dipolar gases, based mainly on the theoretical developments in our own group. First, we discuss shortly weakly interacting…
Quantum stability of self-organized atomic insulator-like states in optical resonators
Jonas Larson, Sonia Fernandez-Vidal, Giovanna Morigi +1
We investigate a paradigm example of cavity quantum electrodynamics with many body systems: an ultracold atomic gas inside a pumped optical resonator. In particular, we study the s…
Quantum Non-Demolition Detection of Strongly Correlated Systems
Kai Eckert, Oriol Romero-Isart, Mirta Rodriguez +3
Preparation, manipulation, and detection of strongly correlated states of quantum many body systems are among the most important goals and challenges of modern physics. Ultracold a…
Entanglement Distribution in Pure-State Quantum Networks
S. Perseguers, J. Wehr, A. Acin +2
We investigate entanglement distribution in pure-state quantum networks. We consider the case when non-maximally entangled two-qubit pure states are shared by neighboring nodes of…
Frustration, Area Law, and Interference in Quantum Spin Models
Aditi Sen De, Ujjwal Sen, Jacek Dziarmaga +2
We study frustrated quantum systems from a quantum information perspective. Within this approach, we find that highly frustrated systems do not follow any general ''area law'' of b…
Entanglement of positive definite functions on compact groups
J. K. Korbicz, J. Wehr, M. Lewenstein
We define and study entanglement of continuous positive definite functions on products of compact groups. We formulate and prove an infinite-dimensional analog of Horodecki Theorem…
Statistical-mechanical description of quantum entanglement
J. K. Korbicz, F. Hulpke, A. Osterloh +1
We present a description of finite dimensional quantum entanglement, based on a study of the space of all convex decompositions of a given density matrix. On this space we construc…
Separability, entanglement and full families of commuting normal matrices
Jan Samsonowicz, Marek Kus, Maciej Lewenstein
We reduce the question whether a given quantum mixed state is separable or entangled to the problem of existence of a certain full family of commuting normal matrices whose matrix…
Strongly Correlated States of Ultracold Rotating Dipolar Fermi Gases
Klaus Osterloh, Nuria Barberán, Maciej Lewenstein
We study strongly correlated ground and excited states of rotating quasi-2D Fermi gases constituted of a small number of dipole-dipole interacting particles with dipole moments pol…