BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Martin Frimmer (ETH Zurich) DTSTART:20200629T160000Z DTEND:20200629T170000Z DTSTAMP:20260422T212730Z UID:QuantumHuddle/1 DESCRIPTION:Title: Optomechanics with a levitated nanoparticle\nby Martin Frimmer ( ETH Zurich) as part of Quantum Huddle\n\n\nAbstract\nLevitated optomechani cs exploits the forces of light to suspend nanoscopic objects in vacuum. T he light field serves both as a handle to mechanically manipulate\, but al so to interrogate various mechanical degrees of freedom of a levitated par ticle. In our talk\, we introduce the audience to the field of levitated o ptomechanics\, and discuss recent experimental progress towards full optom echanical control of the rotational and translational degrees of freedom o f a levitated nanoparticle. In particular\, we focus on feedback cooling a levitated particle’s motion to the few-phonon regime\, where first sign atures of its motional ground state emerge.\n\nMartin studied physics at t he Technical University of Munich. He performed his PhD work at the AMOLF Institute in Amsterdam in the field of nano-optics. Currently\, Martin is a lecturer and research scientist at the Photonics Laboratory of ETH Zuric h\, where he focuses on optomechanics with optically levitated nanoparticl es.\n LOCATION:https://researchseminars.org/talk/QuantumHuddle/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Javier Aizpurua (UPV/EHU) DTSTART:20200706T160000Z DTEND:20200706T170000Z DTSTAMP:20260422T212730Z UID:QuantumHuddle/2 DESCRIPTION:Title: Photoinduced electron dynamics in metallic nanogaps from first princ iples calculations\nby Javier Aizpurua (UPV/EHU) as part of Quantum Hu ddle\n\n\nAbstract\nA nanoscale gap between two metallic nanoparticles is an ideal platform to exploit the interplay between electron currents and p hotonic excitations. The capability of a metallic gap to enhance the ampli tude of the induced plasmonic field produces a variety of non-linear effec ts [1\,2] which can be exploited in different applications in optoelectron ics\, such as optical rectification\, light emission driven by DC currents \, or high-harmonic generation\, among others. Furthermore\, in ultranarro w gaps\, tunneling of electrons at optical frequencies has been found to s creen the plasmonic bonding gap resonance\, and activate a new distributio n of optical modes characterized by optical charge transfer [3].\n\nHere w e address the complex dynamics of photoelectrons driven by single-cycle op tical pulses in nanoscale gaps. By solving Schrödinger equation within th e framework of Time-Dependent Density Functional Theory (TDDFT)\, the curr ents of the electrons photoemitted across the gap can be monitored\, ident ifying ultrafast electron bursts where electron quiver occurs when the amp litude of the induced field at the plasmonic gap is reversed within the op tical cycle. The properties of the amplitude and carrier-envelope phase (C EP) of the incident pulse\, together with the gap length determine the com plex electron dynamics [4\,5\,6]. \n\nExperimental measurements of the cur rent autocorrelations for pairs of such pulses with controlled relative de lay between them\, confirms the ultrafast dynamics of the photoelectrons i n the gap and its complexity.\n\nReferences\n[1] D.C. Marinica et al.\, "Q uantum plasmonics: nonlinear effects in the field enhancement of a plasmon ic dimer". Nano Lett. 12\, 1333 (2012).\n[2] A. Babaze et al.\, "Second-Ha rmonic Generation from a Quantum Emitter Coupled to a Metallic Nanoantenna ". ACS Photonics 7\, 701-713 (2020) .\n[3] K.J. Savage et al.\, "Revealing the quantum regime in tunneling plasmonics". Nature 491\, 574 (2012).\n[4 ] G. Aguirregabiria et al.\, "Dynamics of electron-emission currents in pl asmonic gaps induced by strong fields". Faraday Discussions 214\, 147-157 (2019).\n[5] M. Ludwig et al.\, "Sub-femtosecond electron transport in a n anoscale gap". Nature Physics 16\, 341–345 (2020).\n[6] M. Ludwig et al. "Active control of ultrafast electron dynamics in plasmonic gaps using an applied bias"\, Phys. Rev. B 101\, 241412(R) (2020).\n LOCATION:https://researchseminars.org/talk/QuantumHuddle/2/ END:VEVENT BEGIN:VEVENT SUMMARY:David Mazziotti (The University of Chicago) DTSTART:20200713T160000Z DTEND:20200713T170000Z DTSTAMP:20260422T212730Z UID:QuantumHuddle/3 DESCRIPTION:Title: Preparation of an exciton condensate on a 53 qubit quantum computer< /a>\nby David Mazziotti (The University of Chicago) as part of Quantum Hud dle\n\n\nAbstract\nQuantum computation promises an exponential speedup of certain classes of classical calculations through the preparation and mani pulation of entangled quantum states. So far most molecular simulations on quantum computers\, however\, have been limited to small numbers of parti cles. In this talk I will discuss our research group's recent preparation of a highly entangled state on a 53-qubit IBM quantum computer\, represent ing 53 particles\, which reveals the formation of an exciton condensate of photon particles and holes. More generally\, I will discuss recent resear ch efforts in our group directed towards exploiting the potential advantag e of quantum computing for chemistry.\n LOCATION:https://researchseminars.org/talk/QuantumHuddle/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Danna Freedman (Northwestern University) DTSTART:20200727T160000Z DTEND:20200727T170000Z DTSTAMP:20260422T212730Z UID:QuantumHuddle/4 DESCRIPTION:Title: Chemistry for the second quantum revolution\nby Danna Freedman ( Northwestern University) as part of Quantum Huddle\n\n\nAbstract\nChemistr y offers an atomically precise way to synthesize qubits. By harnessing che mical precision we can place atoms exactly where we want them. Research on constructing chemical qubits and understanding their coherence properties will be presented. Recent results on creating optically addressable molec ular qubits or molecular color centers will be highlighted.\n LOCATION:https://researchseminars.org/talk/QuantumHuddle/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Juan Carlos Idrobo (Center for Nanophase Materials Sciences\, Oak Ridge National Laboratory) DTSTART:20200720T160000Z DTEND:20200720T170000Z DTSTAMP:20260422T212730Z UID:QuantumHuddle/5 DESCRIPTION:Title: 2020 A New Resolution Odyssey: An Electron Microscope for Quantum Ma terials Research\nby Juan Carlos Idrobo (Center for Nanophase Material s Sciences\, Oak Ridge National Laboratory) as part of Quantum Huddle\n\n\ nAbstract\nHere\, I will present several examples demonstrating how the ne w generation of monochromators\, aberration-correctors and cameras in STEM can rival the capabilities of synchrotrons and allow to probe materials b ehavior at the nanometer and atomic scales in complete new ways. Specifica lly\, I will show how by utilizing the phase of the electron probe one can reveal the anti-ferromagnetic order of complex-oxide materials [1]\, and explore the ferromagnetic strength at the interfaces of thin-film complex- oxide heterostructures [2] at the atomic level. I will also explain how ST EM can be used to detect site-specific isotopic labels in amino acids at t he nanometer scale [3]\, and show our current efforts in obtaining a vibra tional spectroscopy atlas of all proteinogenic amino acids via EELS. Lastl y\, I will discuss potentially relevant new challenges that electron micro scopy will need to resolve in the future. Would it be possible to map orbi tals and spins with atomic resolution and with single atom sensitivity? Co uld we detect a superconducting transition? Could we detect minute concent rations of isotopic elements and perform radiocarbon dating at the nanosca le? These questions will be addressed and further elaborated during the pr esentation [4]. References: [1] J. C. Idrobo\, et al.\, Adv. Struc. Chem. Img. 2 (2016)\, p. 5. [2] J. C. Idrobo\, et al.\, unpublished (2020). [3] J. A. Hachtel\, et al.\, Science 363 (2019)\, p. 525. [4] This research wa s supported by the Center for Nanophase Materials Sciences\, which is a De partment of Energy Office of Science User Facility\, and instrumentation w ithin ORNL's Materials Characterization Core provided by UT-Battelle\, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy.\ n LOCATION:https://researchseminars.org/talk/QuantumHuddle/5/ END:VEVENT END:VCALENDAR