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A note on the optimality of decomposable entanglement witnesses and completely entangled subspaces
Remigiusz Augusiak, Jordi Tura, Maciej Lewenstein
Entanglement witnesses (EWs) constitute one of the most important entanglement detectors in quantum systems. Nevertheless, their complete characterization, in particular with respe…
Realistic Time-Reversal Invariant Topological Insulators With Neutral Atoms
N. Goldman, I. Satija, P. Nikolic +4
We lay out an experiment to realize time-reversal invariant topological insulators in alkali atomic gases. We introduce an original method to synthesize a gauge field in the near-f…
Fermion- and spin-counting in strongly correlated systems in and out of thermal equilibrium
Sibylle Braungardt, Mirta Rodriguez, Aditi Sen De +3
Atom counting theory can be used to study the role of thermal noise in quantum phase transitions and to monitor the dynamics of a quantum system. We illustrate this for a strongly…
Dirac Equation For Cold Atoms In Artificial Curved Spacetimes
O. Boada, A. Celi, J. I. Latorre +1
We argue that the Fermi-Hubbard Hamiltonian describing the physics of ultracold atoms on optical lattices in the presence of artificial non-Abelian gauge fields, is exactly equival…
The ground state of binary systems with a periodic modulation of the linear coupling
Armand Niederberger, Boris A. Malomed, Maciej Lewenstein
We consider a quasi-one-dimensional two-component systm, described by a pair of Nonlinear Schrödinger/Gross-Pitaevskii Equations (NLSEs/GPEs), which are coupled by the linear mixin…
On structural physical approximations and entanglement breaking maps
Remigiusz Augusiak, Joonwoo Bae, Łukasz Czekaj +1
Very recently a conjecture saying that the so-called structural physical approximations (SPAa) to optimal positive maps (optimal entanglement witnesses) give entanglement breaking…
Complete devil's staircase and crystal--superfluid transitions in a dipolar XXZ spin chain: A trapped ion quantum simulation
Philipp Hauke, Fernando M. Cucchietti, Alexander Müller-Hermes +3
Systems with long-range interactions show a variety of intriguing properties: they typically accommodate many meta-stable states, they can give rise to spontaneous formation of sup…
Emerging Bosons with Three-Body Interactions from Spin-1 Atoms in Optical Lattices
Leonardo Mazza, Matteo Rizzi, Maciej Lewenstein +1
We study two many-body systems of bosons interacting via an infinite three-body contact repulsion in a lattice: a pairs quasi-condensate induced by correlated hopping and the discr…
Topological superfluids on a lattice with non-Abelian gauge fields
A. Kubasiak, P. Massignan, M. Lewenstein
Two-component fermionic superfluids on a lattice with an external non-Abelian gauge field give access to a variety of topological phases in presence of a sufficiently large spin im…
Multi-Component Quantum Gases in Spin-Dependent Hexagonal Lattices
Parvis Soltan-Panahi, Julian Struck, Philipp Hauke +7
Periodicity is one of the most fundamental structural characteristics of systems occurring in nature. The properties of these systems depend strongly on the symmetry of the underly…
Disorder-Induced Order in Quantum XY Chains
Armand Niederberger, Marek M. Rams, Jacek Dziarmaga +3
We observe signatures of disorder-induced order in 1D XY spin chains with an external, site-dependent uni-axial random field within the XY plane. We numerically investigate signatu…
Engineering Time-Reversal Invariant Topological Insulators With Ultra-Cold Atoms
N. Goldman, I. Satija, P. Nikolic +4
Topological insulators are a broad class of unconventional materials that are insulating in the interior but conduct along the edges. This edge transport is topologically protected…
Controlled hole doping of a Mott insulator of ultracold fermionic atoms
Andre Eckardt, Maciej Lewenstein
Considering a system of ultracold atoms in an optical lattice, we propose a simple and robust implementation of a quantum simulator for the homogeneous t-J model with a well-contro…