FP7

International Conference on Integrated Quantum Photonics - abstract submission open!

Date: 
2017-09-26 - 2017-09-29
Registration deadline: 
2017-04-15 (All day)
Place: 
Rome, Italy
The Conference is organized in the framework of two European PICQUE (www.picque.eu) and QUCHIP (www.quchip.eu) projects and will serve as final conference to both projects. The scientific program foresees tutorial lectures, invited seminars on scientific results, oral contributions and posters.
 
Deadline for abstract submission: 15 April 2017
 

PICQUE Scientific School: Architectures for Quantum Photonic Circuits

Date: 
2017-02-08 - 2017-02-10
Registration deadline: 
2017-01-09 (All day)
Place: 
Nice, France
The Initial Training Network (ITN, European Marie Curie actions) PICQUE, for ‘Photonic Integrated Compound Quantum Encoding’, organizes its last scientific school on “Architectures for Quantum Photonic Circuits".
It notably concerns young fellows and will be held at the University Côte d’Azur in Nice, France, from the 8th to the 10th of February 2017.
 

Quantum Interfaces with Nano-opto-electro-mechanical devices: Applications and Fundamental Physics

Date: 
2016-06-21 - 2016-08-05
Registration deadline: 
2016-07-15 (All day)
Place: 
Erice, Sicily, Italy
Dear Colleagues,
 
I would kindly draw your attention to the international conference "Quantum Interfaces with Nano-opto-electro-mechanical devices: Applications and Fundamental Physics" which will be held at the Ettore Majorana Foundation and Center for Scientific Culture, Erice (Sicily), Italy, from Sunday July 31 2016 (expected day of arrival) to Friday August 5 2016 (departure in the afternoon). 
 

Laser damage creates backdoors in quantum communications

Date: 
2015-10-12 - 2016-06-17
Author(s): 

Vadim Makarov, Jean-Philippe Bourgoin, Poompong Chaiwongkhot, Mathieu Gagné, Thomas Jennewein, Sarah Kaiser, Raman Kashyap, Matthieu Legré, Carter Minshull, Shihan Sajeed

Reference: 

arXiv:1510.03148
submitted to PRL

Practical quantum communication (QC) protocols are assumed to be secure provided implemented devices are properly characterized and all known side channels are closed. We show that this is not always true. We demonstrate a laser-damage attack capable of modifying device behaviour on-demand. We test it on two practical QC systems for key distribution and coin-tossing, and show that newly created deviations lead to side channels. This reveals that laser damage can be a potential security risk to existing QC systems, and necessitates extensive countermeasure testing to guarantee security.

Laser damage creates backdoors in quantum communications

Date: 
2015-10-12 - 2016-06-17
Author(s): 

Vadim Makarov, Jean-Philippe Bourgoin, Poompong Chaiwongkhot, Mathieu Gagné, Thomas Jennewein, Sarah Kaiser, Raman Kashyap, Matthieu Legré, Carter Minshull, Shihan Sajeed

Reference: 

arXiv:1510.03148
submitted to PRL

Practical quantum communication (QC) protocols are assumed to be secure provided implemented devices are properly characterized and all known side channels are closed. We show that this is not always true. We demonstrate a laser-damage attack capable of modifying device behaviour on-demand. We test it on two practical QC systems for key distribution and coin-tossing, and show that newly created deviations lead to side channels. This reveals that laser damage can be a potential security risk to existing QC systems, and necessitates extensive countermeasure testing to guarantee security.

Gaps between industrial and academic solutions to implementation loopholes in QKD: testing random-detector-efficiency countermeasure in a commercial system

Date: 
2016-01-05 - 2016-06-17
Author(s): 

Anqi Huang, Shihan Sajeed, Poompong Chaiwongkhot, Mathilde Soucarros, Matthieu Legre, Vadim Makarov

Reference: 

arXiv:1601.00993
submitted to IEEE Journal of selected topics in quantum electronics

In the last decade, efforts have been made to reconcile theoretical security with realistic imperfect implementations of quantum key distribution (QKD). However, in the process gaps have recently emerged between academic and industrial approaches to closing loopholes created by implementation imperfections. In academic research labs, many practical security problems appear to be reliably solved, in principle, by advanced schemes and protocols. Meanwhile the industry prefers practical and easier solutions, even without security verification in some cases.

Quantum computations on a topologically encoded qubit

Date: 
2016-06-07
Author(s): 

D. Nigg, M. Müller, E. A. Martinez, P. Schindler, M. Hennrich, T. Monz, M. A. Martin-Delgado, R. Blatt

Reference: 

Science 345, 302 (2014)

The construction of a quantum computer remains a fundamental scientific and technological challenge because of the influence of unavoidable noise. Quantum states and operations can be protected from errors through the use of protocols for quantum computing with faulty components. We present a quantum error-correcting code in which one qubit is encoded in entangled states distributed over seven trapped-ion qubits. The code can detect one bit flip error, one phase flip error, or a combined error of both, regardless on which of the qubits they occur.

Electromagnetically-induced-transparency ground-state cooling of long ion strings

Date: 
2016-06-07
Author(s): 

R. Lechner, C. Maier, C. Hempel, P. Jurcevic, B. P. Lanyon, T. Monz, M. Brownnutt, R. Blatt, C. F. Roos

Reference: 

Phys. Rev. A 93, 053401 (2016)

Electromagnetically-induced-transparency (EIT) cooling is a ground-state cooling technique for trapped particles. EIT offers a broader cooling range in frequency space compared to more established methods. In this work, we experimentally investigate EIT cooling in strings of trapped atomic ions. In strings of up to 18 ions, we demonstrate simultaneous ground-state cooling of all radial modes in under 1 ms. This is a particularly important capability in view of emerging quantum simulation experiments with large numbers of trapped ions.

Sympathetic cooling and detection of a hot trapped ion by a cold one

Date: 
2016-06-07
Author(s): 

M. Guggemos, D. Heinrich, O. A. Herrera-Sancho, R. Blatt, C. F. Roos

Reference: 

New J. Phys. 17, 103001 (2015)

We investigate the dynamics of an ion sympathetically cooled by another laser-cooled ion or small ion crystal. To this end, we develop simple models of the cooling dynamics in the limit of weak Coulomb interactions. Experimentally, we create a two-ion crystal of Ca+ and Al+ by photo-ionization of neutral atoms produced by laser ablation. We characterize the velocity distribution of the laser-ablated atoms crossing the trap by time-resolved fluorescence spectroscopy.

Quasiparticle engineering and entanglement propagation in a quantum many-body system

Date: 
2016-06-07
Author(s): 

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

Reference: 

Nature 511, 202 (2014)

The key to explaining and controlling a range of quantum phenomena is to study how information propagates around many-body systems. Quantum dynamics can be described by particle-like carriers of information that emerge in the collective behaviour of the underlying system, the so-called quasiparticles1.

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