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Equilibration in low-dimensional quantum matrix models

Thu, 2014-10-23 15:03 - Martin Kliesch
Date: 
2014-03-06 - 2014-10-23
Author(s): 

R. Hübener, Y. Sekino, J. Eisert

Reference: 

arXiv:1403.1392

URL: 

http://arxiv.org/abs/arXiv:1403.1392

Emergence of coherence and the dynamics of quantum phase transitions

Thu, 2014-10-23 14:29 - Martin Kliesch
Date: 
2014-03-27 - 2014-10-23
Author(s): 

S. Braun, M. Friesdorf, S.S. Hodgman, M. Schreiber, J.P. Ronzheimer, A. Riera, M. del Rey, I. Bloch, J. Eisert, U. Schneider

Reference: 

arXiv:1403.7199

URL: 

http://arxiv.org/abs/1403.7199

Entanglement of nanoelectromechanical oscillators by Cooper-pair tunneling

Thu, 2014-10-23 14:05 - Martin Kliesch
Date: 
2013-07-26 - 2014-10-23
Author(s): 

Stefan Walter, Jan Carl Budich, Jens Eisert, and Björn Trauzettel

Reference: 

Phys. Rev. B 88, 035441 (2013); DOI: http://dx.doi.org/10.1103/PhysRevB.88.035441

URL: 

http://arxiv.org/abs/1210.0665

QUTE-EUROPE Summer School, QESS 2015

Wed, 2014-10-22 14:30 - admin
Date: 
2015-06-21 - 2015-06-27
Registration deadline: 
2015-01-16 (All day)
Place: 
Hindåsgården, Hindås, Sweden
Website: 

http://www.chalmers.se/en/departments/mc2/education/Events/Quantum%20Sim...

 

Quantum Simulation and Computation: From fundamentals to applications and implementations

 
June 21-27, 2015, Hindåsgården, Hindås, Sweden

Ideal negative measurements in quantum walks disprove theories based on classical trajectories

Tue, 2014-10-21 15:21 - Wolfgang Alt
Date: 
2015-01-20
Author(s): 

Carsten Robens, Wolfgang Alt, Dieter Meschede, Clive Emary, Andrea Alberti

Reference: 

Phys. Rev. X 5, 011003 (2015)

URL: 

http://dx.doi.org/10.1103/PhysRevX.5.011003

We report on a stringent test of the nonclassicality of the motion of a massive quantum particle, which propagates on a discrete lattice. Measuring temporal correlations of the position of single atoms performing a quantum walk, we observe a $6\sigma$ violation of the Leggett-Garg inequality. Our results rigorously excludes (i.e., falsifies) any explanation of quantum transport based on classical, well-defined trajectories.

Decoherence Models for Discrete-Time Quantum Walks and their Application to Neutral Atom Experiments

Tue, 2014-10-21 15:08 - Wolfgang Alt
Date: 
2014-12-19
Author(s): 

Andrea Alberti, Wolfgang Alt, Reinhard Werner, Dieter Meschede

Reference: 

New J. Phys. 16, 123052 (2014)

URL: 

http://dx.doi.org/10.1088/1367-2630/16/12/123052

We discuss decoherence in discrete-time quantum walks in terms of a phenomenological model that distinguishes spin and spatial decoherence. We identify the dominating mechanisms that affect quantum-walk experiments realized with neutral atoms walking in an optical lattice.

Carrier-free Raman manipulation of trapped neutral atoms

Tue, 2014-10-21 14:27 - Wolfgang Alt
Date: 
2014-10-21
Author(s): 

René Reimann, Wolfgang Alt, Tobias Macha, Dieter Meschede, Natalie Thau, Seokchan Yoon, Lothar Ratschbacher

Reference: 

New J. Phys. 16 113042

URL: 

http://dx.doi.org/10.1088/1367-2630/16/11/113042

We experimentally realize an enhanced Raman control scheme for neutral atoms that features an intrinsic suppression of the two-photon carrier transition, but retains the sidebands which couple to the external degrees of freedom of the trapped atoms. This is achieved by trapping the atom at the node of a blue detuned standing wave dipole trap, that acts as one field for the two-photon Raman coupling. The improved ratio between cooling and heating processes in this configuration enables a five times lower fundamental temperature limit for resolved sideband cooling.

Paper "Matrix-Product Operators and States: NP-Hardness and Undecidability" Published on PRL

Thu, 2014-10-16 12:19 - Mattia Giardini
Summary: 

Fhttp://qurope.eu/db/publications/matrix-product-operators-and-states-np-hardness-and-undecidability as PRL on the 16th October 2014

The paper, authored by M. Kliesch, D. Gross, and J. Eisert, has been published the 10th October 2014 on Phys. Rev. Lett. 113 (2014);

Quantum simulation of the Schwinger model: A study of feasibility

Wed, 2014-10-15 11:24 - Mari-Carmen Banuls
Date: 
2014-10-15
Author(s): 

Stefan Kühn, J. Ignacio Cirac, Mari-Carmen Bañuls

Reference: 

Phys. Rev. A 90, 042305 (2014)

URL: 

http://journals.aps.org/pra/abstract/10.1103/PhysRevA.90.042305

We analyze some crucial questions regarding the practical feasibility of quantum simulation for lattice gauge models. Our analysis focuses on two different models suitable for the quantum simulation of the Schwinger Hamiltonian which we investigate numerically using Tensor Networks. In particular we explore the effect of representing the gauge degrees of freedom with finite dimensional systems, and show that the results converge fast, thus even with small dimensions it is possible to obtain reasonable accuracy.

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