### Forthcoming department seminars

*Date* : 22 May 2024, 13:00

*Speaker* : **prof. Karol Zyczkowski, Jagiellonian University, Cracow; Center for Theoretical Physics, Warsaw**

*Title* : **Entropy of Quantum Entanglement**

*Abstract* :

A brief introduction to entanglement of multipartite pure quantum states will be provided. Entanglement of a bi-partite pure quantum state can be characterized by its entanglement entropy, defined as von Neumann entropy of the partial trace. This quantity measures the information lost by tracing out one subsystem.

As the Bell states are known to be maximally entangled among all two-qubit quantum states, a natural question arises: What is the most entangled state for the quantum system consisting of N sub-systems with d levels each? The answer depends on the entanglement measure selected, but already for four-qubit system there is no state, which displays maximal entanglement with respect to all three possible splittings of the systems into two pairs of qubits.

Absolutely maximally entangled (AME) states of 2n subsystems, being maximally entangled with respect to all possible symmetric splitting of the system, find their applications for information processing tasks. For instance, the |GHZ> state of four qutrits allows one to teleport a single qutrit between any two parties, while the 'more entangled' AME state of four qutrits enables us to teleport two qutrits from any selected pair of users to the remaining two parties. After a brief review of the issue of entanglement in multipartite systems some open problems will be presented.

### Seminar archive

- 24.04.2024 – “YFS resummation within the Sherpa framework” Alan Price
- 20.02.2024 – “Phase space for precision Monte Carlos Part III” Zbigbiew Was
- 13.02.2024 – “Phase space for precision Monte Carlos Part II” Zbigbiew Was
- 06.02.2024 – “Phase space for precision Monte Carlos” Zbigbiew Was
- 12.12.2023 – “A new subtraction scheme at NLO exploiting the privilege of kT-factorization” Andreas van Hameren
- 09.03.2021 – “The Stochastic Gravitational Background: current status and prospects for the future” Nick van Remortel
- 09.06.2020 – “Supersymmetric gauge theory” Hiren Kakkad
- 19.05.2020 – “Heavy Quarks Embedded in Glasma” Alina Czajka
- 05.05.2020 – “Bremsstrahlung spectrum and rate of medium induced gluons: approximations and resummation” Konrad Tywoniuk
- 21.04.2020 – “Medium-induced gluon radiation with full resummation of multiple scatterings for realistic parton-medium interactions” Fabio Dominguez
- 07.04.2020 – “QED and QCD helicity amplitudes in parton-shower gauge” Kentarou Mawatari
- 06.12.2019 – High Energy QCD journal club “A short review on recent developments in TMD factorization and implementation” Marcin Bury
- 15.11.2019 – High Energy QCD journal club. Friday. 13.30. “Summary of lectures at school on amplitudes” Etienne Blanco
- 30.10.2019 – High Energy QCD journal club “Medium Induced Transverse Momentum Broadening via Forward Dijet Correlations” Martin Rohrmoser
- 15.10.2019 – High Energy QCD journal club “Probing parton saturation with forward Z0-boson production at small transverse momentum in p+p and p+A collisions” Krzysztof Kutak
- 11.04.2018 – “Lessons from Maschine Learning of Higgs CP measurements in H–>tau+tau-, tau–>3pi nu for the tt TauSpinner and ‘truth’ simulation of leptons” Zbigniew Wąs
- 20.03.2018 – “A brief turist guide through Lattice Boltzmann Method - reloaded” Robert Straka
- 14.03.2018 – “PDF flavor determination” Fred Olness
- 28.02.2018 – “Multi quark production - quantum interference effects” Alex Kovner (skype talk)
- 07.02.2018 – “A brief turist guide through Lattice Boltzmann Method” Robert Straka
- 31.01.2018 – “TMDs in jet physics” Wouter Waalewijn (skype talk)
- 20.12.2017 – “Electronic fluids on a surface” Piotr Surówka
- 13.12.2017 – “Recent measurements with hard probes in heavy-ion collisions by ATLAS” Iwona Grabowska-Bołd
- 06.12.2017 – “How to calculate/organize higher QED corrections in a way friendly to soft photon resumation” Stanisław Jadach
- 08.11.2017 – “Exploring the QCD phase diagram with net-proton cumulants at RHIC” Adam Bzdak
- 18.10.2017 – “Scientific Computing on Highly-elastic Cloud Infrastructures” Maciej Malawski
- 04.10.2017 – “One-loop amplitudes with an off-shell gluon” Andreas van Hameren
- 13.09.2017 – “Fuchsia and Master Integrals for Energy-Energy Correlations at NLO in QCD” Oleksandr Gituliar
- 14.06.2017 – “Last updates on TAUOLA and physical context” Jakub Zaremba
- 07.06.2017 – “On the universality of the MC factorization scheme” Stanisław Jadach
- 31.05.2017 – “Hidden structure in the MHV Lagrangian” Piotr Kotko
- 24.05.2017 – “Studies of LHC Physics in the Context of Exact Amplitude-Based Resummation Realized by MC Methods” Aditi Mukhopadhyay
- 17.05.2017 – “Semi-analytic and numerical description by PHOTOS of the extra lepton pair emission corrections to Z boson production and decay” Serge Antropov
- 10.05.2017 – “Inclusive Jpsi pair production at LHC revisited” Wolfgang Schafer
- 26.04.2017 – “Non-equilibrium fluid dynamics in high-energy heavy-ion reactions-part 2” Radosław Ryblewski
- 19.04.2017 – “Non-equilibrium fluid dynamics in high-energy heavy-ion reactions-part 1” Radosław Ryblewski
- 12.04.2017 – “High energy QCD processes with saturation at NLO” Renaud Boussarie
- 05.04.2017 – “Soft gluons & colour evolution” Rene Angeles Martinez
- 29.03.2017 – “Unintegrated parton densities” Marcin Bury
- 22.03.2017 – “Towards description of jets in heavy ion collisions within HEF” Michal Deak
- 15.03.2017 – “High Energy Factorization @ tree-level-plus-parton showers: the case for 4-jets” Mirko Serino
- 07.03.2017 – “Single inclusive very forward jet production” Krzysztof Kutak