Creating and sharing knowledge for telecommunications

Seeing earthquakes and distributing entanglement on the international telecoms network


on 17-07-2018

... André Xuereb, University of Malta

Date & Time: Thursday, July 17, 15:00
Location: Room P9, Mathematics Building, Instituto Superior Técnico, Lisbon


Abstract:

Detecting ocean-floor seismic activity is crucial for our understanding of the interior structure and dynamic behaviour of the Earth. However, 70% of the planet’s surface is covered by water and seismometers coverage is limited to a handful of permanent ocean bottom stations.

In the first part of this talk I discuss our recent results [1], where we showed that existing telecommunication optical fibre cables can detect seismic events when combined with state-of-the-art frequency metrology techniques by using the fibre itself as the sensing element. We detected earthquakes over terrestrial and submarine links with length ranging from 75 to 535 km and a geographical distance from the earthquake's epicentre ranging from 25 to 18,500 km. Implementing a global seismic network for real-time detection of underwater earthquakes requires applying the proposed technique to the existing extensive submarine optical fibre network.

In the second part of the talk I will discuss briefly how we distributed entanglement between Malta and Sicily [2] over the telecommunications network using polarisation-entangled photon pairs.

[1] http://science.sciencemag.org/content/early/2018/06/13/science.aat4458
[2] http://arxiv.org/abs/1803.00583 More Information..

Workshop Gulbenkian Talents in Quantum Technologies


on 13-07-2018

... Date: Friday 13 July 2018
Venue: Anfiteatro EA3, in the first floor of the North Tower, Instituto Superior Técnico, Lisbon

In this workshop, the students from the Gulbenkian Programme New Talents in Quantum Technologies will present the results of their research projects, carried out in 2017/18.
The Workshop is open to the public, especially to bachelor and master students interested in Quantum Technologies. More Information..