QUROPE Quantum Information Processing and Communication in Europe

The formulation of massless relativistic fermions in lattice gauge theories is hampered by the fundamental problem of species doubling, namely, the rise of spurious fermions modifying the underlying physics. A suitable tailoring of the fermion masses prevents such abundance of species, and leads to the so-called Wilson fermions. Here we show that ultracold atoms provide us with the first controllable realization of these paradigmatic fermions, thus generating a quantum simulator of fermionic lattice gauge theories. We describe a novel scheme that exploits laser-assisted tunneling in a cubic optical superlattice to design the Wilson fermion masses. The high versatility of this proposal allows us to explore a variety of interesting phases in three-dimensional topological insulators, and to test the remarkable predictions of axion electrodynamics.

We study a gas of dipolar Bosons confined in a two-dimensional optical lattice. Dipoles are considered to point freely in both up and down directions perpendicular to the lattice plane. This results in a nearest neighbor repulsive (attractive) interaction for aligned (anti-aligned) dipoles. We find regions of parameters where the ground state of the system exhibits insulating phases with either ferromagnetic or anti-ferromagnetic ordering. Evidences for the existence of a novel counterflow supersolid quantum phase are also presented.

Spin chains have long been considered as candidates for quantum channels to facilitate quantum communication. We consider the transfer of a single excitation along a spin-1/2 chain governed by Heisenberg-type interactions. We build on the work of Balachandran and Gong [1], and show that by applying optimal control to an external parabolic magnetic field, one can drastically increase the propagation rate by two orders of magnitude. In particular, we show that the theoretical maximum propagation rate can be reached, where the propagation of the excitation takes the form of a dispersed wave.

We examine two dimensional mixture of single-component fermions and dipolar bosons. We calculate the self-enregies of the fermions in the normal state and the Cooper pair channel by including first order vertex correction to derive a modified Eliashberg equation. We predict appearance of superfluids with various non-standard pairing symmetries at experimentally feasible transition temperatures within the strong-coupling limit of the Eliashberg equation. Excitations in these superfluids are anyonic and follow non-Abelian statistics.

The purpose of this first CHIST-ERA conference will be to bring together personalities and scientists from the community of the call topics (Quantum Information Foundations and Technologies and Self-Awareness & Self-Consciousness) preliminarily chosen by the CHIST-ERA Consortium and that will be called for in the first CHIST-ERA transnational call for projects.

• Quantum Information Theory and Computation (Beige, Dunningham, Kendon, Pachos, Spiller)
• Foundations of Quantum Mechanics (Dunningham, Beige, Spiller)
• Optical and Solid State Implementations (Beige, Pachos, Spiller)
• Bose Einstein Condensation (Dunningham, Pachos, Spiller)
• Topological Quantum Computation (Pachos)
• Quantum Simulations and Transport (Kendon)
• Quantum Cryptography (Razavi, Spiller, Beige)
• Quantum Communication Networks (Razavi)

Theory of quantum gases and experiments with ultracold gases

quantum optics, atomic physics, nonlinear dynamics, statistical physics, quantum field theory, many body systems, disordered systems, neural networks, quantum information, foundations of quantum mechanics

• Control issues emerging from quantum information processing tasks and their connections with information, dynamical systems and operator theories