on 11-09-2015
The 2015/16 edition of our Quantum Computation and Information Seminar.
We are kicking off this Friday with Rúben Sousa, currently a MMA student at IST who will tell us about some of his previous quantum work:
Pretty good state transfer of entangled states through quantum spin chains
Rúben Sousa (Instituto Superior Técnico)
11/09/2015, at 14:00
Room P9, Mathematics Building, IST
Since the transfer of quantum states from one site to another is a key task in quantum information processing, the one-dimensional spin-1/2 chain has been extensively studied as a quantum wire for the transfer of qubit states. The ideal scenario is that where we have unit fidelity of transfer, but unfortunately it has been demonstrated that such perfect transfer cannot be achieved within chains with basic nearest-neighbor couplings.
In this talk, I will address the notion of pretty good state transfer, where the requirement is only slightly relaxed: here the requirement is that the fidelity of transfer gets arbitrarily close to one. Then, I will show that any multi-qubit state can be transferred with arbitrarily large fidelity through the uniform XX quantum spin chain if and only if the length of the chain is n=p 1, n=2p 1, where p is prime, or n=2k 1. This result highlights the link between quantum dynamics and primality, and opens the way to using uniformly coupled spin chains as short-distance quantum channels for the transfer of arbitrary states of any dimension. I will discuss how the experimental implementation of this transfer protocol can be carried out with current technology.
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on 07-09-2015
The 23th edition of the annual International Conference on Advanced Laser Technologies (ALT), established in 1992 by the Nobel Prize Laureate Alexander Prokhorov, was held on 7-11 September 2015 in the University of Algarve, Faro. It was organized this time by Instituto de Telecomunicações, I3N, and University of Algarve.
The main objective of this international event is to bring together presentations on fundamental and engineering aspects of laser technologies along with their applications in various areas (material processing, laser medicine, photonic devices, systems for process control, etc.). Thus the conference has become an important and well recognized forum for both researchers and engineers.
Traditionally, each year the ALT Conference takes place in a new country. This gives a unique mixture of specialists and thus the possibility of making new contacts and exchanging scientific and technological data and ideas between different scientific schools.
This year the conference had nearly 200 participants from the five continents, gathered around scientific topics where IT is a strong player, such as: SENSORS, OPTICAL COMMUNICATION, QUANTUM INTERACTION AND MANIPULATION, etc.
The 24th edition of the ALT conference will be held in Galway, Ireland.
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