Group seminars

Only some of the recent local seminars are shown.


Title:  Stability analysis of electroweak-dark strings [pdf]

Speaker:  Árpad Lukács

Abstract:  The stability of  "visible" electroweak-type cosmic strings is investigated in an extension of the Standard Model (SM) by a minimal dark sector, consisting of a U(1) gauge field, broken spontaneously by a scalar. The "visible" and dark sectors are coupled through a Higgs-portal and a gauge-kinetic mixing term. It is found that strings whose core is "filled" with a dark scalar condensate exhibit better stability properties than their analogues in the SM, when the electroweak mixing angle is close to theta=pi/2. They become  unstable as one lets theta approach its physical value. The instability mechanism appears to be a W-boson condensation mechanism found in previous studies on the stability of electroweak strings.

Date:  Wednesday, 11 March 2020

Tine: 11:40 am

Location: Seminar Room, Department of Theoretical Physics


N. Muñoz (UPV/EHU), Quantum mechanics with real numbers, A6.P1.5., 15:00–16:00, 6 June 2017.


Student journal club (within the Graduate course in the Master's program in Quantum Science and Technology at UPV/EHU)

Place: ZTF 0.13
Time: 16:00, Thursday, 23 March, 2017

Ibai Aedo Goñi

Mikel Alvarez Urquiola

Emma Campillo Muñoz

Daniel Martinez Cercos

Nuria Muñoz Gargante

Miguel Peidro Montava

Ibai Zabala Cordobes


M. Kleinmann (UPV), Emergence of Quantum Bipartite Correlations & Dvorezky's theorem, A6.P1.5., 12:00–13:00, 22 March 2017.


F. Huber (University of Siegen, Germany), Absolutely Maximal Entangled States, Faculty of Sciences, A6.P1.5., 12:00-13:00, 9 December 2016.


D. Sokolovski (UPV/EHU), Weak measurements, Seminar room of the Department of Physical Chemistry, 11:30-13:00, 2 November 2016.


M. Kleinmann (UPV/EHU), A primer on contextuality, Seminar room of the Department of Theoretical Physics, 15:00-16:00, 25 October 2016.


Gael Sentis (UPV/EHU), Decomposition of POVMs to extremal POVMs, 11:00, 28 of April, 2016.


Giuseppe Vitagliano (UPV/EHU), Gabriel Fagundes (UPV/EHU) and Iagoba Apellaniz (UPV/EHU), Group Seminars: Trial talks for DPG Spring Meeting and Recent Advances in QM , 11:00, 25 of February, 2016.


Giuseppe Vitagliano (UPV/EHU), Journal club: E. Shchukin and P. van Loock, Phys. Rev. A 92, 042328 (2015), 11:00, 3 of February, 2016.


Matthias Kleinmann (UPV/EHU), Journal club: "Why a qubit is not a quantum coin". 11:00, 28 of January, 2016.


Giuseppe Vitagliano (UPV/EHU), Journal club: R. Augusiak, J. Kolodynski, A. Streltsov, M. Nath Bera, A. Acin, M. Lewenstein, Asymptotic irrelevance of entanglement in quantum metrology, arxiv:1506.08837, 11:00, 17 December, 2015.


Iagoba Apellaniz  (UPV/EHU), Journal club: F. Fröwis, P. Sekatski, and W. Dür, Detecting large quantum Fisher information with finite measurement precision, arxiv:1509.03334, 11:00, 3 December, 2015.


Giuseppe Vitagliano  (UPV/EHU), Seminar on spin squeezing inequalities detecting Dicke states, 15:00, 2 December, 2015.


Trial of Ph.D. talk of Giuseppe Vitagliano, Sala 4, Faculty of Sciences, 15:00, 7 October, 2015.


Seminar of Gael Sentis (UPV/EHU), 17 June, 2015.


Trial presentations preparing for the Conference of the Germany Physical Society in Heidelberg, Seminar room of the Department of Theoretical Physics, 12:00-13:00, 18 March 2015.


Trial presentations preparing for the Conference of the Germany Physical Society in Heidelberg, Sala 4, 15:00-16:00, 17 March 2015.


G. Vitagliano, Journal club: Q. Y. He, Shi-Guo Peng, P. D. Drummond, and M. D. Reid, Planar quantum squeezing and atom interferometry, Phys. Rev. A 84, 022107 (2011), G. Puentes, G. Colangelo, R.J. Sewell, and M.W. Mitchell, Planar squeezing by quantum non-demolition measurement in cold atomic ensembles, New J. Phys. 15, 103031 (2013), 12:00-13:00, 3 March, 2015.


Student journal club (within the Graduate course in the Master's program in Quantum Science and Technology at UPV/EHU)

Place: Seminar Room, Dept. of Theoretical Physics, Corridor 4.-2.
Time: 11:00, Wednesday, 18 March,2015

Iñigo Arrazola: No-cloning theorem
Hodei Eneriz: Separability Criterion for Density Matrices (A. Peres)

Alfredo Serrano: Universal Optimal Cloning of Arbitrary Quantum States:  From Qubits to Quantum Registers (V. Buzek, M. Hillery)


S. Altenburg, Journal club: H. Strobel, W. Muessel, D. Linnemann, T. Zibold, D.B. Hume, L. Pezzè, A. Smerzi, and M.K. Oberthaler, Fisher information and entanglement of non-Gaussian spin state, 12:00-13:00, 12 February, 2015.


G. Vitagliano, The Leggett-Garg inequality - discussion of a draft (group seminar), Department of Theoretical Physics, University of the Basque Country UPV/EHU, 15:30, 2 December 2014.


G. Vitagliano, The Leggett-Garg inequality (group seminar), Department of Theoretical Physics, University of the Basque Country UPV/EHU, 15:30, 14 May 2014.


25 March: Student journal club (within the Graduate course in the Master's program in Quantum Science and Technology at UPV/EHU)

Place: Seminar Room, Dept. of Theoretical Physics, Corridor 4.-2.
Time: 11:00, Tuesday, 25 March, 2013

11:00-11:25: Xabi Lopez Gonzalez: Separability Criterion for Density Matrices (A. Peres)

11:25-11:50: Urtzi las Heras: Quantum Cryptography Based on Bell's Theorem (A.K. Ekert)

11:50-12:00: Break

12:00-12:25: Laura Garcia Alvarez: Universal Optimal Cloning of Arbitrary Quantum States: From Qubits to Quantum Registers (V. Buzek and M. Hillary)

12:25-12:50: Iker Leanizbarrutia Alonso: A single quantum cannot be cloned (W.K. Wootters and W.H. Zurek)