- Materia-seminarios

Seminario (presencial y online): Macroscopically nonlocal quantum correlations.
by Daniel Manzano 07 Jun '21

07 Jun '21

El Grupo de Física Estadística de los sistemas Complejos les invita al siguiente seminario, que se realizará de manera presencial y online. Speaker: Miguel Gallego Ballester. University of Vienna. Title: Macroscopically nonlocal quantum correlations. Abstract: It is usually believed that coarse-graining of quantum correlations leads to classical correlations in the macroscopic limit. Such a principle, known as macroscopic locality, has been proved for correlations arising from independent and identically distributed (IID) entangled pairs. In this work we consider the generic (non-IID) scenario. We find that the Hilbert space structure of quantum theory can be preserved in the macroscopic limit. This leads directly to a Bell violation for coarse-grained collective measurements, thus breaking the principle of macroscopic locality. Reference: https://arxiv.org/abs/2104.03988#:~:text=It%20is%20usually%20believed%20tha… <https://arxiv.org/abs/2104.03988#:~:text=It%20is%20usually%20believed%20tha…> Fecha y hora: Viernes 11 de Junio a las 10:00. Lugar: Aula de ordenadores del Área de Física de la Materia (hasta completar aforo) y vía Google Meet: https://meet.google.com/bqi-vemu-gro <https://meet.google.com/bqi-vemu-gro> --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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Fwd: [Materia] [Recordatorio] Webinars: "Spectral signature of dynamical phase transitions" & "Sincronización crítica en el cerebro" - miércoles 26, 12:00h
by Daniel Manzano 25 May '21

25 May '21

> Begin forwarded message: > > From: José M. Martín <jmartin(a)onsager.ugr.es> > Subject: [Materia] [Recordatorio] Webinars: "Spectral signature of dynamical phase transitions" & "Sincronización crítica en el cerebro" - miércoles 26, 12:00h > Date: 25 May 2021 at 22:02:16 CEST > To: materia(a)onsager.ugr.es > > Estimados compañeros, > Os recuerdo el próximo seminario del Grupo de Física Estadística: > > Ponente: Rubén Hurtado > > Título: Spectral signature of dynamical phase transitions > Abstract: En el estudio espectral de la transiciones de fase dinámicas (DPTs por sus siglas en inglés), los autovectores del generador de la dinámica juegan un papel fundamental. Aunque estos autovectores son muy utilizados y estudiados para la obtención de resultados concretos, en muchos casos una compresión "global" del papel jugado por cada autovector en la DPT está ausente. En esta charla, mostraremos como este rol de los autovectores en las DPTs puede ser analizado desde la distribución de probabilidad para el parámetro de orden de la transición asociada a cada autovector. Se presentarán, de forma muy breve, algunos resultados teóricos generales al respecto y se comprobará su validez aplicándolos al ejemplo concreto del modelo WASEP de gas reticular para diferentes condiciones de contorno. > > > > Ponente: Víctor Buendía > > Título: Sincronización crítica en el cerebro > > > Abstract: En los últimos años se ha especulado mucho sobre la idea de que los sistemas biológicos obtengan ventajas evolutivas trabjando cerca del punto crítico de una transición de fase. A pesar de la evidencia acumulada para diversos sistemas, el debate en el caso del cerebro sigue abierto a día de hoy. En esta charla corta revisaré algunos conceptos fundamentales sobre la criticidad en el cerebro y discutiré la posibilidad de que dicha transicion sea una transición de sincronización. > > > > Chairman: Pedro Garrido > > > > Fecha y hora: Miércoles 26 de mayo de 2021. 12:00 horas. > > > > Enlace: https://zoom.us/j/94394488189 <https://zoom.us/j/94394488189> > Enlace alternativo: https://www.youtube.com/watch?v=gHTTYDIfQbk <https://www.youtube.com/watch?v=gHTTYDIfQbk> > > Por favor, usad el enlace de zoom para uniros a la sesión. Si tenéis problemas, podéis usar el enlace alternativo a Youtube. > > > > Un saludo > > José M. Martín > > > > _______________________________________________ > Materia mailing list > Materia(a)onsager.ugr.es > https://onsager.ugr.es/mailman/listinfo/materia

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Fwd: [Materia] [Links para la reunión] Webinars: Spectral signature of dynamical phase transitions & Sincronización crítica en el cerebro
by Daniel Manzano 24 May '21

24 May '21

--------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/> > Begin forwarded message: > > From: José M. Martín <jmartin(a)onsager.ugr.es> > Subject: [Materia] [Links para la reunión] Webinars: Spectral signature of dynamical phase transitions & Sincronización crítica en el cerebro > Date: 24. May 2021 at 11:38:52 CEST > To: materia <materia(a)onsager.ugr.es> > > Estimados compañeros, > > Os recuerdo el próximo seminario del Grupo de Física Estadística: > > Ponente: Rubén Hurtado > > Título: Spectral signature of dynamical phase transitions > Abstract: En el estudio espectral de la transiciones de fase dinámicas (DPTs por sus siglas en inglés), los autovectores del generador de la dinámica juegan un papel fundamental. Aunque estos autovectores son muy utilizados y estudiados para la obtención de resultados concretos, en muchos casos una compresión "global" del papel jugado por cada autovector en la DPT está ausente. En esta charla, mostraremos como este rol de los autovectores en las DPTs puede ser analizado desde la distribución de probabilidad para el parámetro de orden de la transición asociada a cada autovector. Se presentarán, de forma muy breve, algunos resultados teóricos generales al respecto y se comprobará su validez aplicándolos al ejemplo concreto del modelo WASEP de gas reticular para diferentes condiciones de contorno. > > > > Ponente: Víctor Buendía > > Título: Sincronización crítica en el cerebro > > > Abstract: En los últimos años se ha especulado mucho sobre la idea de que los sistemas biológicos obtengan ventajas evolutivas trabjando cerca del punto crítico de una transición de fase. A pesar de la evidencia acumulada para diversos sistemas, el debate en el caso del cerebro sigue abierto a día de hoy. En esta charla corta revisaré algunos conceptos fundamentales sobre la criticidad en el cerebro y discutiré la posibilidad de que dicha transicion sea una transición de sincronización. > > > > Chairman: Pedro Garrido > > > > Fecha y hora: Miércoles 26 de mayo de 2021. 12:00 horas. > > > > Enlace: https://zoom.us/j/94394488189 <https://zoom.us/j/94394488189> > Enlace alternativo: https://www.youtube.com/watch?v=gHTTYDIfQbk <https://www.youtube.com/watch?v=gHTTYDIfQbk> > > Por favor, usad el enlace de zoom para uniros a la sesión. Si tenéis problemas, podéis usar el enlace alternativo a Youtube. > > > > Un saludo > > José M. Martín > > > > _______________________________________________ > Materia mailing list > Materia(a)onsager.ugr.es > https://onsager.ugr.es/mailman/listinfo/materia

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Recordatorio de Webminar: Mpemba effect in Markovian open quantum systems
by Daniel Manzano 22 Apr '21

22 Apr '21

El Grupo de Física Estadística de los Sistemas Complejos de la Universidad de Granada les invita al siguiente seminario online: Speaker: Dr. Federico Carollo. University of Tübingen. Title: Mpemba effect in Markovian open quantum systems Abstract: The Mpemba effect is the phenomenon for which a hotter liquid can cool at a faster rate than a colder one. This effect is nowadays receiving much attention; it has been predicted for different classical systems and it has even been observed experimentally for a trapped colloid particle. In this talk, I will propose an analogue of the Mpemba effect for Markovian open quantum systems. I will show that the relaxation dynamics of these systems can be exponentially accelerated by devising an optimal unitary transformation, that is applied to the quantum state immediately before the actual dynamics. This preliminary “rotation” is engineered in such a way that the state of the quantum system becomes orthogonal to the slowest decaying dynamical mode. I will illustrate potential applications of this effect by showing how it can be used to achieve an exponential speed-up in the convergence to stationarity in Dicke models as well as to avoid metastable regimes in an all-to-all interacting spin system. Date and time: Friday, April 23rd, 12:00. Link: https://meet.google.com/smu-dsfx-mqk <https://meet.google.com/smu-dsfx-mqk> --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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Webminar: Mpemba effect in Markovian open quantum systems
by Daniel Manzano 20 Apr '21

20 Apr '21

El Grupo de Física Estadística de los Sistemas Complejos de la Universidad de Granada les invita al siguiente seminario online: Speaker: Dr. Federico Carollo. University of Tübingen. Title: Mpemba effect in Markovian open quantum systems Abstract: The Mpemba effect is the phenomenon for which a hotter liquid can cool at a faster rate than a colder one. This effect is nowadays receiving much attention; it has been predicted for different classical systems and it has even been observed experimentally for a trapped colloid particle. In this talk, I will propose an analogue of the Mpemba effect for Markovian open quantum systems. I will show that the relaxation dynamics of these systems can be exponentially accelerated by devising an optimal unitary transformation, that is applied to the quantum state immediately before the actual dynamics. This preliminary “rotation” is engineered in such a way that the state of the quantum system becomes orthogonal to the slowest decaying dynamical mode. I will illustrate potential applications of this effect by showing how it can be used to achieve an exponential speed-up in the convergence to stationarity in Dicke models as well as to avoid metastable regimes in an all-to-all interacting spin system. Date and time: Friday, April 23rd, 12:00. Link: https://meet.google.com/smu-dsfx-mqk --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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[Recordatorio] Webminar: From quantum simulations of fermionic models to continuous-variable quantum computation.
by Daniel Manzano 15 Apr '21

15 Apr '21

El grupo de Física Estadística de los Sistemas Complejos de la Universidad de Granada les invita al siguiente seminario (atentos a la hora no habitual): Fecha y hora: Viernes 16 de Abril. 10:30. Ponente: Laura García-Álvarez. Chalmers University of Technology. Title: From quantum simulations of fermionic models to continuous-variable quantum computation. Abstract: Firstly, I will introduce digital-analog and purely digital methods for quantum simulations of fermionic models. The digital-analog approach provides a higher degree of scalability than purely digital or analog techniques, and it is suitable for implementing quantum simulations of interacting fermions and bosons in condensed matter, and quantum field theories [1]. Purely digital quantum simulations [2,3,4] are grouped under standard discrete-variable quantum computation, while analog quantum simulators with bosonic fields can be described with the language of continuous-variable (CV) quantum computation. The second part of the talk is devoted to analyzing the factors that may yield quantum advantage. In particular, Wigner negativity is known to be a necessary resource for computational advantage in several quantum-computing architectures, including those based on continuous variables [5,6]. However, it is not a sufficient resource, and it is an open question under which conditions CV circuits displaying Wigner negativity offer the potential for quantum advantage. I will present large families of circuits that display large Wigner negativity and yet are classically efficiently simulatable [7], although they were not recognized as such by previously available theorems. References: [1] L. García-Álvarez et al., Fermion-fermion scattering in quantum field theory with superconducting circuits, Phys. Rev. Lett. 114, 070502 (2015). [2] R. Barends et al., Digital quantum simulation of fermionic models with a superconducting circuit, Nat. Commun. 6, 7654 (2015). [3] J. M. Kreula et al., Few-qubit quantum-classical simulation of strongly correlated lattice fermions, EPJ Quantum Technology 3, 11 (2016). [4] L. García-Álvarez et al., Digital quantum simulation of minimal AdS/CFT, Phys. Rev. Lett. 119, 040501 (2017). [5] A. Mari and J. Eisert, Phys. Rev. Lett. 109, 230503 (2012). [6] V. Veitch, N. Wiebe, C. Ferrie, and J. Emerson, New J. of Phys. 15, 013037 (2013). [7] L. García-Álvarez et al., Efficient simulatability of continuous-variable circuits with large Wigner negativity, Phys. Rev. Research 2, 043322 (2020). Enlace: https://meet.google.com/wmk-nsik-qyz <https://meet.google.com/wmk-nsik-qyz> --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/> --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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Webminario: From quantum simulations of fermionic models to continuous-variable quantum computation.
by Daniel Manzano 13 Apr '21

13 Apr '21

El grupo de Física Estadística de los Sistemas Complejos les invita al siguiente seminario (atentos a la hora no habitual): Fecha y hora: Viernes 16 de Abril. 10:30. Ponente: Laura García-Álvarez. Chalmers University of Technology. Title: From quantum simulations of fermionic models to continuous-variable quantum computation. Abstract: Firstly, I will introduce digital-analog and purely digital methods for quantum simulations of fermionic models. The digital-analog approach provides a higher degree of scalability than purely digital or analog techniques, and it is suitable for implementing quantum simulations of interacting fermions and bosons in condensed matter, and quantum field theories [1]. Purely digital quantum simulations [2,3,4] are grouped under standard discrete-variable quantum computation, while analog quantum simulators with bosonic fields can be described with the language of continuous-variable (CV) quantum computation. The second part of the talk is devoted to analyzing the factors that may yield quantum advantage. In particular, Wigner negativity is known to be a necessary resource for computational advantage in several quantum-computing architectures, including those based on continuous variables [5,6]. However, it is not a sufficient resource, and it is an open question under which conditions CV circuits displaying Wigner negativity offer the potential for quantum advantage. I will present large families of circuits that display large Wigner negativity and yet are classically efficiently simulatable [7], although they were not recognized as such by previously available theorems. References: [1] L. García-Álvarez et al., Fermion-fermion scattering in quantum field theory with superconducting circuits, Phys. Rev. Lett. 114, 070502 (2015). [2] R. Barends et al., Digital quantum simulation of fermionic models with a superconducting circuit, Nat. Commun. 6, 7654 (2015). [3] J. M. Kreula et al., Few-qubit quantum-classical simulation of strongly correlated lattice fermions, EPJ Quantum Technology 3, 11 (2016). [4] L. García-Álvarez et al., Digital quantum simulation of minimal AdS/CFT, Phys. Rev. Lett. 119, 040501 (2017). [5] A. Mari and J. Eisert, Phys. Rev. Lett. 109, 230503 (2012). [6] V. Veitch, N. Wiebe, C. Ferrie, and J. Emerson, New J. of Phys. 15, 013037 (2013). [7] L. García-Álvarez et al., Efficient simulatability of continuous-variable circuits with large Wigner negativity, Phys. Rev. Research 2, 043322 (2020). Enlace: https://meet.google.com/wmk-nsik-qyz <https://meet.google.com/wmk-nsik-qyz> --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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[Cambio de Hora] Webminario: Speck of Chaos
by Daniel Manzano 25 Mar '21

25 Mar '21

[Atentos al cambio de hora] El grupo de Física Estadística de los Sistemas Complejos les invita al siguiente seminario online: Ponente: Francisco Perez-Bernal. Universidad de Huelva. Título: Speck of Chaos Resumen: Local perturbations can bring an integrable quantum many-body system to the chaotic regime. This fact has been known for the XXZ model since 2004, and such results have been recently extended to two other models: the transverse-field Ising chain and the Lai-Sutherland spin 1 chain. The nature of different quantum chaos indicators, static and dynamic, will be reviewed, to discuss how a single local effect can bring three different integrable systems to the chaotic regime. Among the possible indicators, the distribution of off-diagonal matrix elements of local operators and the correlation hole will be presented with more detail. Fecha y hora: Viernes 26 de Marzo de 2021. 12:30 horas. Enlace: https://meet.google.com/vyq-ucva-vdj <https://meet.google.com/vyq-ucva-vdj> Check our previous talks: Ricardo Gutierrez: Generalized optimal paths and weight distributions on networks. <https://youtu.be/xyjgh0xeXbo> Beatriz Olmos: Collective coupling of an array of atoms near a nanofiber <https://youtu.be/OBKkd-XHAa8> Daniel Maria Busiello: Non-equilibrium selection of chemical states driven by dissipation phenomena <https://youtu.be/rFJAo14o68Q> Atentamente, --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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Seminar Series: Excited State Quantum Phase Transitions and related topics
by Daniel Manzano 24 Mar '21

24 Mar '21

Starting in March 2021, The University of Huelva is organizing a series of online seminars about Excited State Quantum Phase Transitions and related topics. The seminars will have a duration of 50-60 minutes plus questions. The aim of this series of talks is to keep the community working in ESQPTs and related topics in touch and aware of the research advances in the different groups working in the field. Among other, talks are expected to deal with developments including: • Experimental evidences of ESQPTs in different quantum many-body systems • Influence of ESQPTs on the dynamics of quantum many-body systems • Thermodynamic consequences of ESQPTs • Possible links between ESQPTs and manifestations of chaos in quantum systems • ESQPTs and quantum information scrambling • Role of ESQPTs in ergodicity and thermalization in many-body quantum systems Talks will be given by senior researchers as well as students and postdocs. Seminars are organized by José Enrique García Ramos and Curro Pérez Bernal in the CEAFMC, University of Huelva. Feel free to reach us out by email with any comments and suggestions. More info: https://www.uhu.es/fmc/ESQPT2021 <https://www.uhu.es/fmc/ESQPT2021> --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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Webminario: Speck of Chaos
by Daniel Manzano 24 Mar '21

24 Mar '21

El grupo de Física Estadística de los Sistemas Complejos les invita al siguiente seminario online: Ponente: Francisco Perez-Bernal. Universidad de Huelva. Título: Speck of Chaos Resumen: Local perturbations can bring an integrable quantum many-body system to the chaotic regime. This fact has been known for the XXZ model since 2004, and such results have been recently extended to two other models: the transverse-field Ising chain and the Lai-Sutherland spin 1 chain. The nature of different quantum chaos indicators, static and dynamic, will be reviewed, to discuss how a single local effect can bring three different integrable systems to the chaotic regime. Among the possible indicators, the distribution of off-diagonal matrix elements of local operators and the correlation hole will be presented with more detail. Fecha y hora: Viernes 26 de Marzo de 2021. 12 horas. Enlace: https://meet.google.com/vyq-ucva-vdj <https://meet.google.com/vyq-ucva-vdj> Check our previous talks: Ricardo Gutierrez: Generalized optimal paths and weight distributions on networks. <https://youtu.be/xyjgh0xeXbo> Beatriz Olmos: Collective coupling of an array of atoms near a nanofiber <https://youtu.be/OBKkd-XHAa8> Daniel Maria Busiello: Non-equilibrium selection of chemical states driven by dissipation phenomena <https://youtu.be/rFJAo14o68Q> Atentamente, --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department Institute “Carlos I” for Theoretical and Computational Physics University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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