12.30.+u Universal quantum simulators with specific systems (e.g. trapped ions, optical lattices, etc.)

Competing valence bond and symmetry-breaking Mott states of spin-3/2 fermions on a honeycomb lattice

Date: 
2015-10-14 - 2016-02-29
Author(s): 

D. Jakab, E. Szirmai, M. Lewenstein, and G. Szirmai

Reference: 

Phys. Rev. B 93, 064434

We investigate magnetic properties of strongly interacting four component spin-3/2 ultracold fermionic atoms in the Mott insulator limit with one particle per site in an optical lattice with honeycomb symmetry. In this limit, atomic tunneling is virtual, and only the atomic spins can exchange. We find a competition between symmetry-breaking and liquidlike disordered phases.

Quantum simulation of a topological Mott insulator with Rydberg atoms in a Lieb lattice

Date: 
2015-10-20 - 2016-04-11
Author(s): 

A. Dauphin, M. Müller, and M. A. Martin-Delgado

Reference: 

Phys. Rev. A 93, 043611

We propose a realistic scheme to quantum simulate the so-far experimentally unobserved topological Mott insulator phase—an interaction-driven topological insulator—using cold atoms in an optical Lieb lattice.

Dual trapped-ion quantum simulators: an alternative route towards exotic quantum magnets

Date: 
2015-11-23 - 2016-03-03
Author(s): 

Tobias Graß, Maciej Lewenstein, Alejandro Bermudez

Reference: 

New J. Phys. 18 033011 (2016)

We present a route towards the quantum simulation of exotic quantum magnetism in ion traps by exploiting dual relations between different spin models. Our strategy allows one to start from Hamiltonians that can be realized with current technology, while properties of an exotic dual model are inferred from measurements of non-local, string-order-like, operators.

Synthetic gauge fields in synthetic dimensions: Interactions and chiral edge modes

Date: 
2016-03-11
Author(s): 

Simone Barbarino, Luca Taddia, Davide Rossini, Leonardo Mazza, and Rosario Fazio

Reference: 

New J. Phys. 18, 035010 (2016)

Synthetic ladders realized with one-dimensional alkaline-earth(-like) fermionic gases and subject to a gauge field represent a promising environment for the investigation of quantum Hall physics with ultracold atoms. Using density-matrix renormalization group calculations, we study how the quantum Hall-like chiral edge currents are affected by repulsive atom-atom interactions. We relate the properties of such currents to the asymmetry of the spin resolved momentum distribution function, a quantity which is easily addressable in state-of-art experiments.

Magnetic crystals and helical liquids in alkaline-earth fermionic gases

Date: 
2015-09-09
Author(s): 

Simone Barbarino, Luca Taddia, Davide Rossini, Leonardo Mazza, and Rosario Fazio

Reference: 

Nature Simone Barbarino, Luca Taddia, Davide Rossini, Leonardo Mazza & Rosario Fazio Simone Barbarino, Luca Taddia, Davide Rossini, Leonardo Mazza & Rosario Fazio Commun. 6, 8134 (2015)

The joint action of a synthetic gauge potential and of atomic contact repulsion in a one-dimensional alkaline-earth(-like) fermionic gas with nuclear spin I leads to the existence of a hierarchy of fractional insulating and conducting states with intriguing properties. We unveil the existence and the features of those phases by means of both analytical bosonization techniques and numerical methods based on the density-matrix renormalization group algorithm.

Anomalous conductances in a tunable Fermi gas

Date: 
2016-05-04
Author(s): 

Sebastian Krinner, Martin Lebrat, Dominik Husmann, Charles Grenier, Jean-Philippe Brantut, Tilman Esslinger

Reference: 

arXiv:1511.05961 [cond-mat.quant-gas]

The conductance of a quantum point contact is quantized in units of 1/h, with h being Planck's constant, which is the universal upper bound to transport set by Heisenberg's and Pauli's principles. Can interactions cause a breakdown of this quantization? Here we answer this question using a cold atom quantum simulation. Our simulation yields the spin and particle conductance of a Fermi gas flowing through a single mode quantum point contact as a function of the strength of attractive interactions.

Connecting strongly correlated superfluids by a quantum point contact

Date: 
2016-05-04
Author(s): 

Dominik Husmann, Shun Uchino, Sebastian Krinner, Martin Lebrat,
Thierry Giamarchi, Tilman Esslinger, Jean-Philippe Brantut

Reference: 

Science 350, 1498 (2015)

Point contacts provide simple connections between macroscopic particle reservoirs. In electric circuits, strong links between metals, semiconductors, or superconductors have applications for fundamental condensed-matter physics as well as quantum information processing. However, for complex, strongly correlated materials, links have been largely restricted to weak tunnel junctions. We studied resonantly interacting Fermi gases connected by a tunable, ballistic quantum point contact, finding a nonlinear current-bias relation.

Observation of a Fragmented, Strongly Interacting Fermi Gas

Date: 
2016-05-04
Author(s): 

Sebastian Krinner, David Stadler, Jakob Meineke, Jean-Philippe Brantut, and Tilman Esslinger

Reference: 

Physical Review Letters 115, 045302 (2015)

We study the emergence of a fragmented state in a strongly interacting Fermi gas subject to a tunable
disorder. We investigate its properties using a combination of high-resolution in situ imaging and
conductance measurements. The fragmented state exhibits saturated density modulations, a strongly
reduced density percolation threshold, lower than the average density, and a resistance equal to that of a
noninteracting Fermi gas in the same potential landscape. The transport measurements further indicate that

Deterministic generation of arbitrary photonic states assisted by dissipation

Date: 
2015-05-26
Author(s): 

A. González-Tudela, V. Paulisch, D. E. Chang, H. J. Kimble, J. I. Cirac

Reference: 

arXiv:1504.07600

A scheme to utilize atom-like emitters coupled to nanophotonic waveguides is proposed for the generation of many-body entangled states and for the reversible mapping of these states of matter to photonic states of an optical pulse in the waveguide.

Subwavelength vacuum lattices and atom-atom interactions in photonic crystals

Date: 
2015-05-26
Author(s): 

A. González-Tudela, C.-L. Hung, D. E. Chang, J. I. Cirac, H. J. Kimble

Reference: 

Nature Photonics, 9, 320-325 (2015)

URL: 

10.1038/nphoton.2015.54

We propose the use of photonic crystal structures to design subwavelength optical lattices in two dimensions for ultracold atoms by using both Guided Modes and Casimir-Polder forces. We further show how to use Guided Modes for photon-induced large and strongly long-range interactions between trapped atoms. Finally, we analyze the prospects of this scheme to implement spin models for quantum simulation.

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