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Quantum simulation of an extra dimension
O. Boada, A. Celi, M. Lewenstein +1
We present a general strategy to simulate a D+1-dimensional quantum system using a D-dimensional one. We analyze in detail a feasible implementation of our scheme using optical lat…
Qubism: self-similar visualization of many-body wavefunctions
Javier Rodriguez-Laguna, Piotr Migdał, Miguel Ibáñez Berganza +2
A visualization scheme for quantum many-body wavefunctions is described, which we have termed qubism. Its main property is its recursivity: increasing the number of qubits reflects…
Glass to superfluid transition in dirty bosons on a lattice
Julia Stasińska, Pietro Massignan, Michael Bishop +3
We investigate the interplay between disorder and interactions in a Bose gas on a lattice in presence of randomly localized impurities. We compare the performance of two theoretica…
Particle Counting Statistics of Time and Space Dependent Fields
Sibylle Braungardt, Mirta Rodríguez, Roy J. Glauber +1
The counting statistics give insight into the properties of quantum states of light and other quantum states of matter such as ultracold atoms or electrons. The theoretical descrip…
Can One Trust Quantum Simulators?
Philipp Hauke, Fernando M. Cucchietti, Luca Tagliacozzo +2
Various fundamental phenomena of strongly-correlated quantum systems such as high- superconductivity, the fractional quantum-Hall effect, and quark confinement are still await…
Order by Disorder in Spin-Orbit Coupled Bose-Einstein Condensates
Ryan Barnett, Stephen Powell, Tobias Grass +2
Motivated by recent experiments, we investigate the system of isotropically-interacting bosons with Rashba spin-orbit coupling. At the non-interacting level, there is a macroscopic…
Dipolar Molecules in Optical Lattices
Tomasz Sowiński, Omjyoti Dutta, Philipp Hauke +2
We study the extended Bose--Hubbard model describing an ultracold gas of dipolar molecules in an optical lattice, taking into account all on-site and nearest-neighbor interactions,…
Distribution of entanglement in networks of bi-partite full-rank mixed states
G. J. Lapeyre, S. Perseguers, M. Lewenstein +1
We study quantum entanglement distribution on networks with full-rank bi-partite mixed states linking qubits on nodes. In particular, we use entanglement swapping and purification…
Optimal decomposable witnesses without the spanning property
Remigiusz Augusiak, Gniewomir Sarbicki, Maciej Lewenstein
One of the unsolved problems in the characterization of the optimal entanglement witnesses is the existence of optimal witnesses acting on bipartite Hilbert spaces H_{m,n}=C^m\otim…
Gauge fields emerging from time reversal symmetry breaking for spin-5/2 fermions in a honeycomb lattice
Gergely Szirmai, Edina Szirmai, Alejandro Zamora +1
We propose an experimentally feasible setup with ultracold alkaline earth atoms to simulate the dynamics of U(1) lattice gauge theories in 2+1 dimensions with a Chern-Simons term.…
An Optical-Lattice-Based Quantum Simulator For Relativistic Field Theories and Topological Insulators
Leonardo Mazza, Alejandro Bermudez, Nathan Goldman +3
We present a proposal for a versatile cold-atom-based quantum simulator of relativistic fermionic theories and topological insulators in arbitrary dimensions. The setup consists of…
Robustness of Fractional Quantum Hall States with Dipolar Atoms in Artificial Gauge Fields
T. Grass, M. A. Baranov, M. Lewenstein
The robustness of fractional quantum Hall states is measured as the energy gap separating the Laughlin ground-state from excitations. Using thermodynamic approximations for the cor…
Quantum Memory Assisted Probing of Dynamical Spin Correlations
O. Romero-Isart, M. Rizzi, C. A. Muschik +3
We propose a method to probe time dependent correlations of non trivial observables in many-body ultracold lattice gases. The scheme uses a quantum non-demolition matter-light inte…
Spin segregation via dynamically induced long-range interaction in a system of ultracold fermions
Ulrich Ebling, Andre Eckardt, Maciej Lewenstein
We investigate theoretically the time evolution of a one-dimensional system of spin-1/2 fermions in a harmonic trap after, initially, a spiral spin configuration far-from equilibri…
Entanglement Spectrum, Critical Exponents and Order Parameters in Quantum Spin Chains
G. De Chiara, L. Lepori, M. Lewenstein +1
We investigate the entanglement spectrum near criticality in finite quantum spin chains. Using finite size scaling we show that when approaching a quantum phase transition, the Sch…
Quantum simulation of frustrated magnetism in triangular optical lattices
Julian Struck, Christoph Ölschläger, Rodolphe Le Targat +5
Magnetism plays a key role in modern technology as essential building block of many devices used in daily life. Rich future prospects connected to spintronics, next generation stor…
Ultracold Dipolar Gases in Optical Lattices
C. Trefzger, C. Menotti, B. Capogrosso-Sansone +1
This tutorial is a theoretical work, in which we study the physics of ultra-cold dipolar bosonic gases in optical lattices. Such gases consist of bosonic atoms or molecules that in…
Atom Counting in Expanding Ultracold Clouds
Sibylle Braungardt, Mirta Rodríguez, Aditi Sen De +2
We study the counting statistics of ultracold bosonic atoms that are released from an optical lattice. We show that the counting probability distribution of the atoms collected at…
Orbital order of spinless fermions near an optical Feshbach resonance
Philipp Hauke, Erhai Zhao, Krittika Goyal +3
We study the quantum phases of a three-color Hubbard model that arises in the dynamics of the p-band orbitals of spinless fermions in an optical lattice. Strong, color-dependent in…
Tunable dipolar resonances and Einstein-de Haas effect in a Rb-87 atoms condensate
Tomasz Swislocki, Tomasz Sowinski, Joanna Pietraszewicz +4
We study a spinor condensate of Rb-87 atoms in F = 1 hyperfine state confined in an optical dipole trap. Putting initially all atoms in mF = 1 component we observe a significant tr…