Result

Coherent many-body spin dynamics in a long-range interacting Ising chain

Date: 
2017-05-23
Author(s): 

Johannes Zeiher, Jae-yoon Choi, Antonio Rubio-Abadal, Thomas Pohl, Rick van Bijnen, Immanuel Bloch, Christian Gross

Reference: 

arXiv:1705.08372

Coherent many-body quantum dynamics lies at the heart of quantum simulation and quantum computation. Both require coherent evolution in the exponentially large Hilbert space of an interacting many-body system. To date, trapped ions have defined the state of the art in terms of achievable coherence times in interacting spin chains. Here, we establish an alternative platform by reporting on the observation of coherent, fully interaction-driven quantum revivals of the magnetization in Rydberg-dressed Ising spin chains of atoms trapped in an optical lattice.

A Coherent Quantum Annealer with Rydberg Atoms

Date: 
2016-11-08
Author(s): 

A. W. Glaetzle, R. M. W. van Bijnen, P. Zoller, W. Lechner

Reference: 

arXiv:1611.02594

There is a significant ongoing effort in realizing quantum annealing with different physical platforms. The challenge is to achieve a fully programmable quantum device featuring coherent adiabatic quantum dynamics. Here we show that combining the well-developed quantum simulation toolbox for Rydberg atoms with the recently proposed Lechner-Hauke-Zoller~(LHZ) architecture allows one to build a prototype for a coherent adiabatic quantum computer with all-to-all Ising interactions and, therefore, a novel platform for quantum annealing.

Optimal control of Rydberg lattice gases

Date: 
2017-02-23
Author(s): 

Jian Cui, Rick van Bijnen, Thomas Pohl, Simone Montangero, Tommaso Calarco

Reference: 

arXiv:1702.07358

We present optimal control protocols to prepare different many-body quantum states of Rydberg atoms in optical lattices. Specifically, we show how to prepare highly ordered many-body ground states, GHZ states as well as some superposition of symmetric excitation number Fock states, that inherit the translational symmetry from the Hamiltonian, within sufficiently short excitation times minimizing detrimental decoherence effects.

Characterizing the local vectorial electric field near an atom chip using Rydberg state spectroscopy

Date: 
2017-05-22
Author(s): 

N. Cisternas, Julius de Hond, G. Lochead, R.J.C. Spreeuw, H.B. van Linden van den Heuvell, N.J. van Druten

Reference: 

arxiv:1705.07685

We use the sensitive response to electric fields of Rydberg atoms to characterize all three vector components of the local electric field close to an atom-chip surface. We measured Stark-Zeeman maps of S and D Rydberg states using an elongated cloud of ultracold Rubidium atoms (T ~2.5 µK) trapped magnetically 100 µm from the chip surface. The spectroscopy of S states yields a calibration for the generated local electric field at the position of the atoms.

A medium-finesse optical cavity for the stabilization of Rydberg lasers

Date: 
2017-05-12
Author(s): 

JULIUS DE HOND, NATALY CISTERNAS, GRAHAM LOCHEAD, AND N.J. VAN DRUTEN

Reference: 

arxiv:1705.04684

Contactless nonlinear optics mediated by long-range Rydberg interactions

Date: 
2016-12-19
Author(s): 

Hannes Busche, Paul Huillery, Simon W. Ball, Teodora Ilieva, Matthew P. A. Jones & Charles S. Adams

Reference: 

Nature Physics (2017), doi:10.1038/nphys4058

In conventional nonlinear optics, linear quantum optics

Single-photon interference due to motion in an atomic collective excitation

Date: 
2016-12-19
Author(s): 

Daniel J. Whiting, Nikola Šibalić, James Keaveney, Charles S. Adams, and Ifan G. Hughes

Reference: 

arXiv:1612.05467v1

Quantum-state engineering is of critical importance to the development of quantum technologies. One promising platform is thermal atomic vapours, because they offer long coherence times with reproducible and scalable hardware. However, the inability to address isolated atomic states in a controlled manner, due to multi-level degeneracy and motional broadening, is a major obstacle to their wider application.

ARC: An open-source library for calculating properties of alkali Rydberg atoms

Date: 
2016-12-16
Author(s): 

N. Šibalic, J. D. Pritchard, C. S. Adams, K. J. Weatherill

Reference: 

arXiv:1612.05529v1

We present an object-oriented Python library for computation of properties of highly-excited Rydberg states of alkali atoms.

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