--------------------------------------------------------------------------------- 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: Juan Jose Garcia-Ripoll Subject: [qipc.spain] Seminarios RITCE - Ana Asenjo, Dic. 2, 15:00 Date: 1. December 2020 at 10:19:11 CET To: jj.garcia.ripoll@csic.es Reply-To: Juan Jose Garcia-Ripoll

Hola a todos,

desde la Red RITCE vamos a comenzar una serie de seminarios sobre tecnologías cuánticas con una periodicidad mensual o bimensual. La primera conferenciante será Ana Asenjo-García, investigadora en Columbia University (https://anaasenjogarcia.com). Debido a que la red está todavía pendiente de adquirir una licencia Zoom para esta y otras actividades, el seminario tendrá lugar por la plataforma BlueJeans del CSIC (instrucciones más abajo) y, si conseguimos solventar las dificultades técnicas, se ofrecerá la grabación en Youtube con posterioridad.

Saludos

Juanjo

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Single-, few-, and many-photon physics in mesoscopic atomic chains Ana Asenjo-García Miércoles 15:00-16:00

Tightly packed ordered arrays of atoms (or, more generally, quantum emitters) exhibit remarkable collective optical properties, as dissipation in the form of photon emission is correlated. In this talk, I will discuss the single-, few- and many-body out-of-equilibrium physics of 1D arrays, and their potential to realize versatile light-matter interfaces. For small enough inter-atomic distances, atomic chains feature dark states that allow for dissipationless transport of photons, behaving as waveguides for single-photon states. Atomic waveguides can be used to mediate interactions between impurity qubits coupled to the array, and allow for the realization of multiple paradigms in waveguide QED, from bandgap physics to chiral quantum optics [1]. Due to the two-level nature of the atoms, atomic waveguides are a perfect playground to realize strong photon-photon interactions. At the many-body level, I will address the open question of how the geometry of the array impacts the process of “Dicke superradiance”, where fully inverted atoms synchronize as they de-excite, emitting light in a burst (in contrast to the exponential decay expected from independent emitters). While most literature attributes the quenching of superradiance to Hamiltonian dipole-dipole interactions, the actual culprits are dissipative processes in the form of photon emission into different optical modes. I will provide an understanding of the physics in terms of collective jump operators and demonstrate that superradiance survives at small inter-atomic distances [2]. I will finish my talk by discussing the implications of correlated photon emission for quantum information processing and metrology.

[1] S. J. Masson, A. Asenjo-Garcia, Atomic-waveguide Quantum Electrodynamics, Physical Review Research 2, 043213 (2020).

[2] S. J. Masson, I. Ferrier-Barbut, L. A. Orozco, A. Browaeys, A. Asenjo-Garcia, Many-body signatures of collective decay in atomic chains, arXiv: 2008.08139 (2020)

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INSTRUCCIONES

- El seminario se retransmitirá por videoconferencia a través de la dirección https://conectaha.csic.es/b/jua-gkf-ouf-uja - La plataforma de videoconferencia necesita de una versión reciente de Chrome, Edge o Firefox. No funcionan ni Safari ni iPad o equivalente. - El acceso a la sala estará moderado, por lo que se pide a los participantes que introduzcan su nombre y afiliación y entren en la sala con unos 5-10 minutos de anticipación. - Mantengan los micrófonos cerrados o regístrense con la opción "auriculares" - Por ancho de banda, se desaconseja el uso de Webcam salvo en el turno de preguntas. - Se pueden escribir preguntas en el chat.

-- Juan José García Ripoll

Quantum Information and Foundations Group Institute of Fundamental Physics IFF-CSIC Calle Serrano 113b, Madrid 28006 Spain http://quinfog.hbar.es - http://juanjose.garciaripoll.com