Quantum Computation

Fast and robust quantum computation with ionic Wigner crystals


J. D. Baltrusch, A. Negretti, J. M. Taylor, T. Calarco


Phys. Rev. A 83, 042319 (2011).

We present a detailed analysis of the modulated-carrier quantum phase gate implemented with Wigner crystals of ions confined in Penning traps. We elaborate on a recent scheme, proposed by two of the authors, to engineer two-body interactions between ions in such crystals. We analyze for the first time the situation in which the cyclotron (w_c) and the crystal rotation (w_r) frequencies do not fulfill the condition w_c=2w_r.

Mathematics and Quantum Information

Research Type: 

Quantum many-body systems

Bell inequalities, non-locality and communication complexity

Quantum channels

David Perez-Garcia

Open Quantum Systems and Entanglement

Research Type: 
Prof. Sabrina Maniscalco

Basel Quantum Transport Lab

Research Type: 

Quantum Transport, Nanoscience, Low-Temperature Physics, Quantum Coherence and Quantum Computation

Dominik Zumbuhl

Fabrication and heating rate study of microscopic surface electrode ion traps


N. Daniilidis, S. Narayanan, S. A. Moeller, R. Clark, T. E. Lee, P. J. Leek, A. Wallraff, St. Schulz, F. Schmidt-Kaler, H. Haeffner

We report heating rate measurements in a microfabricated gold-on-sapphire surface electrode ion trap with trapping height of approximately 240 micron. Using the Doppler recooling method, we characterize the trap heating rates over an extended region of the trap. The noise spectral density of the trap falls in the range of noise spectra reported in ion traps at room temperature. We find that during the first months of operation the heating rates increase by approximately one order of magnitude.

Storage of Multiple Coherent Microwave Excitations in an Electron Spin Ensemble


Hua Wu, Richard E. George, Janus H. Wesenberg, Klaus Mølmer, David I. Schuster, Robert J. Schoelkopf, Kohei M. Itoh, Arzhang Ardavan, John J. L. Morton, and G. Andrew D. Briggs


Phys. Rev. Lett. 105, 140503 (2010)

Strong coupling between a microwave photon and electron spins, which could enable a long-lived quantum memory element for superconducting qubits, is possible using a large ensemble of spins. This represents an inefficient use of resources unless multiple photons, or qubits, can be orthogonally stored and retrieved. Here we employ holographic techniques to realize a coherent memory using a pulsed magnetic field gradient and demonstrate the storage and retrieval of up to 100 weak 10 GHz coherent excitations in collective states of an electron spin ensemble.

Trapped ions as quantum bits: Essential numerical tools (Colloquium)


K. Singer, U. Poschinger, M. Murphy, P. Ivanov, F. Ziesel, T. Calarco, F. Schmidt-Kaler


Rev. Mod. Phys. 82, 2609 (2010)

Trapped laser-cooled atoms and ions are quantum systems which can be experimentally controlled with an as yet unmatched degree of precision. Due to the control of the motion and the internal degrees of freedom, these quantum systems can be adequately described by a well-known Hamiltonian. In this colloquium, powerful numerical tools for the optimization of the external control of the motional and internal states of trapped neutral atoms, explicitly applied to the case of trapped laser-cooled ions in a segmented ion-trap are presented.

Quantum Photonics

Research Type: 
  • ion trapping
  • atom trapping
  • entangled photons
  • atom-photon interfaces
  • single-photon sources
  • cavity QED
  • laser cooling
Jürgen Eschner

CHIST-ERA - Call open


The CHIST-ERA project has published its first call. See details at the Call Announcement.


First CHIST-ERA Joint Transnational Call

The 1st call for proposals within the ERA-Net CHIST-ERA (European Coordinated Research on Long term Challenges in Information and Communication Sciences and Technologies) is open.

Call deadline: 5th of November 2010, 17:00 GMT

CHIST-ERA is looking for highly innovative and multidisciplinary projects in ICST; and is open to new ideas and original solutions, involving interdisciplinary skills in order to strenghten a broader community in the merging of their understanding and their questioning. In addition, the transformative research done in CHIST-ERA will explore new topics with potential for significant scientific and technical impacts. In the first call, two completely different topics are addressed:
1. Quantum Information Foundations and Technologies (QIFT)
2. Beyond Autonomic Systems - the Challenge of Consciousness (BASCC)
Research project consortia are invited to submit transnational proposals electronically on www.chistera.eu (the submission area will be made available by mid-September).  At the same time, every partner in the project has to bear in mind the specific local application rules/requirements of each national funding organisation. Therefore it is strongly recommended to contact your National Contact Point. The Call Announcement and the official templates for the fulfilment of proposals are available on www.chistera.eu. Moreover, the CHIST-ERA website provides a tool for submitting Expressions of Interest, and to search and find collaborative partners for common projects (available by mid-September).
CHIST-ERA Call Secretariat
Mathieu Girerd
French National Research Agency (ANR)
0033 1 7354 8213
mathieu [dot] girerd [at] agencerecherche [dot] fr

Observing Quantum Particles in Perfect Order

Scientists at the Max Planck Institute of Quantum Optics succeed in recording single-atom resolved images of a highly correlated quantum gas.

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