Upcoming seminars

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: 

The measurement postulates of quantum mechanics are redundant

Seminar date and time: 
2019-03-11 12:00
Author: 
Lluis Masanes
Affiliation: 
Department of Physics and Astronomy, University College London

Understanding the core content of quantum mechanics requires us to disentangle the hidden logical relationships between the postulates of this theory. The theorem presented in this talk shows that the mathematical structure of quantum measurements, the formula for assigning outcome probabilities (Born’s rule) and the post-measurement state-update rule, can be deduced from the other quantum postulates, often referred to as “unitary quantum mechanics”.

Location: 
Contact: 

Self-testing of quantum states and measurements and its application to entanglement certification.

Seminar date and time: 
2019-03-06 14:30
Author: 
Joseph Bowles
Affiliation: 
ICFO, Barcelona

Self-testing is a method to infer the underlying state and measurement operators used in an experiment in a device-independent manner, i.e. treating the devices as black boxes. I will introduce self-testing and give a simple example. Then, based on the works [1], and [2], I will show how self-testing can be used to certify device-independently the entanglement of any entangled quantum state.

Location: 
GIQ Seminar Room
Contact: 
Joseph.Bowles@icfo.eu

Quantum Biology of Magnetoreception

Seminar date and time: 
2019-03-05 14:30
Author: 
Nathan S. Babcock
Affiliation: 
University of Exeter, UK

Despite an established consensus that many forms of life can reliably detect the Earth's weak magnetic field, it is unclear how many complex organisms sense it [1]. Most prominent mechanistic proposals invoke a quantum-biological model [2], relying on the assumption that an excitonic “radical” electron pair [3] facilitates magnetoreception of the Earth's field (50 μT).

Location: 
GIQ Seminar Room (C5/262)
Contact: 
N.S.Babcock@exeter.ac.uk

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