QIPC

CP(N-1) quantum field theories with alkaline earth atoms in optical lattices

Date: 
2015-07-24 - 2016-06-07
Author(s): 

C. Laflamme, W. Evans, M. Dalmonte, U. Gerber, H. Mejía-Díaz, W. Bietenholz, U.-J. Wiese, P. Zoller

Reference: 

Annals of Physics (2016), pp. 117-127.

We propose a cold atom implementation to attain the continuum limit of (1+1)-d CP(N-1) quantum field theories. These theories share important features with (3+1)-d QCD, such as asymptotic freedom and θ vacua. Moreover, their continuum limit can be accessed via the mechanism of dimensional reduction. In our scheme, the CP(N-1) degrees of freedom emerge at low energies from a ladder system of SU(N) quantum spins, where the N spin states are embodied by the nuclear Zeeman states of alkaline-earth atoms, trapped in an optical lattice.

Stretched exponential decay of Majorana edge modes in many-body localized Kitaev chains under dissipation

Date: 
2015-07-22 - 2016-06-07
Author(s): 

Alexander Carmele, Markus Heyl, Christina Kraus, Marcello Dalmonte

Reference: 

Phys. Rev. B 92, 195107 (2015).

We investigate the resilience of symmetry-protected topological edge states at the boundaries of Kitaev chains in the presence of a bath which explicitly introduces symmetry-breaking terms. Specifically, we focus on single-particle losses and gains, violating the protecting parity symmetry, which could generically occur in realistic scenarios. For homogeneous systems, we show that the Majorana mode decays exponentially fast. By the inclusion of strong disorder, where the closed system enters a many-body localized phase, we find that the Majorana mode can be stabilized substantially.

Spectroscopy of interacting quasiparticles in trapped ions

Date: 
2015-05-08 - 2016-06-07
Author(s): 

P. Jurcevic, P. Hauke, C. Maier, C. Hempel, B. P. Lanyon, R. Blatt, C. F. Roos

Reference: 

Phys. Rev. Lett. 115, 100501 (2015).

The static and dynamic properties of many-body quantum systems are often well described by collective excitations, known as quasiparticles. Engineered quantum systems offer the opportunity to study such emergent phenomena in a precisely controlled and otherwise inaccessible way. We present a spectroscopic technique to study artificial quantum matter and use it for characterizing quasiparticles in a many-body system of trapped atomic ions. Our approach is to excite combinations of the system's fundamental quasiparticle eigenmodes, given by delocalised spin waves.

Synthetic helical liquids with ultracold atoms in optical lattices

Date: 
2015-05-11 - 2016-06-07
Author(s): 

J. C. Budich, C. Laflamme, F. Tschirsich, S. Montangero, P. Zoller

Reference: 

Phys. Rev. B 92, 245121 (2015).

We discuss a platform for the synthetic realization of key physical properties of helical Tomonaga Luttinger liquids (HTLLs) with ultracold fermionic atoms in one-dimensional optical lattices. The HTLL is a strongly correlated metallic state where spin polarization and propagation direction of the itinerant particles are locked to each other.

Real-time dynamics in U(1) lattice gauge theories with tensor networks

Date: 
2015-05-17 - 2016-06-07
Author(s): 

T. Pichler, M. Dalmonte, E. Rico, P. Zoller, S. Montangero

Reference: 

Phys. Rev. X 6, 011023 (2016).

Tensor network algorithms provide a suitable route for tackling real-time dependent problems in lattice gauge theories, enabling the investigation of out-of-equilibrium dynamics. We analyze a U(1) lattice gauge theory in (1+1) dimensions in the presence of dynamical matter for different mass and electric field couplings, a theory akin to quantum-electrodynamics in one-dimension, which displays string-breaking: the confining string between charges can spontaneously break during quench experiments, giving rise to charge-anticharge pairs according to the Schwinger mechanism.

Many-body localization in a quantum simulator with programmable random disorder

Date: 
2015-08-27 - 2016-06-07
Author(s): 

Jacob Smith, Aaron Lee, Philip Richerme, Brian Neyenhuis, Paul W. Hess, Philipp Hauke, Markus Heyl, David A. Huse, Christopher Monroe

Reference: 

arXiv:1508.07026 (to appear in Nature Physics)

When a system thermalizes it loses all local memory of its initial conditions. This is a general feature of open systems and is well described by equilibrium statistical mechanics. Even within a closed (or reversible) quantum system, where unitary time evolution retains all information about its initial state, subsystems can still thermalize using the rest of the system as an effective heat bath. Exceptions to quantum thermalization have been predicted and observed, but typically require inherent symmetries or noninteracting particles in the presence of static disorder.

Analog quantum simulation of (1+1)D lattice QED with trapped ions

Date: 
2016-04-11 - 2016-06-07
Author(s): 

Dayou Yang, Gouri Shankar Giri, Michael Johanning, Christof Wunderlich, Peter Zoller, Philipp Hauke

Reference: 

arXiv:1604.03124

The prospect of quantum simulating lattice gauge theories opens exciting possibilities for understanding fundamental forms of matter. Here, we show that trapped ions represent a promising platform in this context when simultaneously exploiting internal pseudo-spins and external phonon vibrations. We illustrate our ideas with two complementary proposals for simulating lattice-regularized quantum electrodynamics (QED) in (1+1) space-time dimensions. The first scheme replaces the gauge fields by local vibrations with a high occupation number.

Non-equilibrium 8 pi Josephson effect in atomic Kitaev wires

Date: 
2016-02-18 - 2016-06-07
Author(s): 

C. Laflamme, J. C. Budich, P. Zoller, M. Dalmonte

Reference: 

arXiv:1602.05845

We theoretically study a Kitaev wire interrupted by an extra site which gives rise to super exchange coupling between two Majorana bound states. We show that this system hosts a tunable, non-equlibrium Josephson effect with a characteristic 8π periodicity of the Josephson current. We elucidate the physical mechanism deriving a minimal model for the junction and confirm its quantitative accuracy by comparison to the numerical solution of the full model.

Real-time dynamics of lattice gauge theories with a few-qubit quantum computer

Date: 
2016-05-15 - 2016-06-07
Author(s): 

E. A. Martinez, C. A. Muschik, P. Schindler, D. Nigg, A. Erhard, M. Heyl, P. Hauke, M. Dalmonte, T. Monz, P. Zoller, R. Blatt

Reference: 

arXiv:1605.04570 (to appear in nature)

Gauge theories are fundamental to our understanding of interactions between the elementary constituents of matter as mediated by gauge bosons. However, computing the real-time dynamics in gauge theories is a notorious challenge for classical computational methods. In the spirit of Feynman's vision of a quantum simulator, this has recently stimulated theoretical effort to devise schemes for simulating such theories on engineered quantum-mechanical devices, with the difficulty that gauge invariance and the associated local conservation laws (Gauss laws) need to be implemented.

Proposal for the quantum simulation of the CP(2) model on optical lattices

Date: 
2015-10-28 - 2016-06-07
Author(s): 

Catherine Laflamme, Wynne Evans, Marcello Dalmonte, Urs Gerber, Héctor Mejía-Díaz, Wolfgang Bietenholz, Uwe-Jens Wiese, Peter Zoller

Reference: 

arXiv:1510.08492

The 2d CP(N-1) models share a number of features with QCD, like asymptotic freedom, a dynamically generated mass gap and topological sectors. They have been formulated and analysed successfully in the framework of the so-called D-theory, which provides a smooth access to the continuum limit. In that framework, we propose an experimental set-up for the quantum simulation of the CP(2) model. It is based on ultra-cold Alkaline-Earth Atoms (AEAs) located on the sites of an optical lattice, where the nuclear spins represent the relevant degrees of freedom.

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