New article on Maximal Entanglement

Alba Cervera-Lierta and José Ignacio Latorre’s work on ‘Maximal Entanglement Generation in High Energy Physics’ has been accepted to SciPost!

This work explores how maximal entanglement is generated at the fundamental level in particle processes such as electron-electron scattering or pair annihilation into photons. It is also shown that the requirement of maximal entanglement constrains the structure of the fundamental interaction. Maximal entanglement is used to obtain a non-trivial prediction for the value of the weak mixing angle, a free parameter of the Standard Model of particles. The results are a first step towards understanding the connections between maximal entanglement and the fundamental symmetries of high-energy physics.

Feynman diagram for electron-positron scattering into a muon-antimuon pair at tree level

The reference of the article is SciPost Phys. 3, 036 (2017).

New article on single photon generation

A new article led by QUANTIC member P. Forn-Díaz has been recently published on Physical Review Applied. The article presents a new method of generating single microwave photons on demand. The new technique consists in controlling the position of nodes of vacuum modes of a transmission line where a superconducting qubit is coupled. This control on the mode profile happens very quickly, in the nanosecond scale, and it results in a real-time tunable qubit-line interaction. This interaction produces photon wavepackets with a shape that can be nearly arbitrary.

Microscope image of the device used to generate single photons. Overlaid with the image are real data traces of single photons generated with a controlled delay

The work was carried out at the laboratory of Prof. Christopher Wilson at the Institute for Quantum Computing in the University of Waterloo (Canada). This result is very relevant for the deployment of microwave quantum networks and to connect sectors of future large-scale quantum computers. The reference of the paper is Physical Review Applied 8, 054015 (2017).

Official presentation of Quantic Group at RICE meeting

Last September 22nd, the Quantic Group at BSC was presented to the Quantum Information Network in Spain (Red de Información Cuántica de España, or RICE) meeting organized at the Barcelona Supercomputing Center.

The event was combined with talks by researchers from RICE. More information at the official event site.

Here are some images of the event:

José Ignacio Latorre introducing the event.
Pol Forn-Díaz explaining the future project at BSC.
Artur García-Sáez introducing quantum simulation.
Juan José García-Ripoll presenting his team at IFF.
Alessio Celi presenting his work on simulating magnetic fields in cold atoms.
Daniel Alsina describing how he programmed the IBM Quantum Processor.
Germán Sierra presenting his work on number theory and quantum algorithms.
Bruno Julia presenting his work on solving number partitioning problems in trapped ions.
Enrique Rico describing the projects at the QUTIS group in Bilbao.
Juan Bermejo-Vega explaining his recent work on verifying quantum speed-up.