Upcoming seminars

Qubit channel parameter estimation with very noisy initial states

Seminar date and time: 
2019-06-21 12:00
Author: 
David Collins
Affiliation: 
Colorado Mesa University

The issue of optimally estimating parameters associated with quantum channels has been thoroughly studied in various contexts, yielded an enhancement of accuracy using resources such as entangled states. For various qubit channels, using the quantum Fisher information per channel invocation as a measure of the estimation accuracy, optimal estimation protocols and the possible advantages that they might yield are well understood. However, these resulting optimal estimation protocols usually require pure initial states.

Location: 
GIQ Seminar Room
Contact: 
dacollin@coloradomesa.edu

Contextual advantage for state-dependent cloning

Seminar date and time: 
2019-05-27 12:00
Author: 
Gabriel Senno
Affiliation: 
ICFO, Barcelona

A number of noncontextual models exist which reproduce different subsets of quantum theory and admit a no-cloning theorem. Therefore, if one chooses noncontextuality as one's notion of classicality, no-cloning cannot be regarded as a nonclassical phenomenon. However, in the work that I'll present in this talk, we show that the phenomenology of quantum state cloning is indeed nonclassical, but not for the reasons usually given.

Location: 
GIQ Seminar Room (C5/262)
Contact: 
Gabriel.Senno@icfo.eu

Introduction to Blockchain

Seminar date and time: 
2019-05-02 12:00
Author: 
Luis Muñoz-Tapia
Affiliation: 
Universitat Politécnica de Catalunya

Blockchain technologies are beginning to mature and  are triggering great interest both in academic and industrial fields. At the technical level, the Blockchain
incorporates concepts from different areas of knowledge such as computer networks, distributed systems, consensus algorithms, security and cryptography,
programming and game theory to create a state machine equally shared among many entities. In this talk I will start by describing a classical centralized

Location: 
GIQ Seminar Room
Contact: 
jose.munoz@entel.upc.edu

Entanglement negativity as a universal non-Markovianity witness

Seminar date and time: 
2019-04-25 12:00
Author: 
Janek Kolodynski
Affiliation: 
University of Warsaw

In order to engineer an open quantum system and its evolution, it is essential to identify and control the memory effects. These are formally attributed to the non-Markovianity of dynamics that manifests itself by the evolution being indivisible in time, a property which can be witnessed by a non-monotonic behavior of contractive functions or correlation measures. We show that by monitoring directly the entanglement behavior of a system in a tripartite setting it is possible to witness all invertible non-Markovian dynamics, as well as all (also non-invertible) qubit evolutions.

Teaching quantum theory in the 21st century

Seminar date and time: 
2019-03-19 12:00
Author: 
Jochen Rau
Affiliation: 
Goethe-Universität Frankfurt am Main

Historically, quantum theory evolved as a microscopic theory of matter. Important milestones included the discoveries of the wave-nature of matter, interference phenomena, the uncertainty principle, and the level structures of atoms and molecules. In the non-relativistic realm, the mathematical centerpiece of this theory of matter is the Schrödinger equation (later extended to account for spin and particle statistics). It is this body of theory which dominates the teaching of quantum mechanics to the present day.

Location: 
GIQ Seminar Room C5/262
Contact: 

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