aspuru-list March 2017

aspuru-list@lists.fas.harvard.edu

21 participants
53 discussions

[Aspuru-Guzik Group List] [qip] no group meeting tomorrow

by Aram Harrow

Dear quanta, We will not have a group meeting tomorrow since enough people seem to want to go to this talk (announcement below) instead. It is not quantum, but has relevance to computing amplitudes of quantum circuits. Next week we will have Marcus Appleby tell us about the SIC-POVM problem and algebraic number theory. -aram ---------- Forwarded message ---------- *STOCHASTICS AND STATISTICS SEMINAR* *|* *FRIDAY, March 3 11AM-12PM in Room E18-304 * https://stat.mit.edu/events/alexander-barvinok-u-michigan/ https://whereis.mit.edu/?go=E18 *Title: * Computing partition functions by interpolation *Speaker: * Alexander Barvinok (UMICH) http://www.math.lsa.umich.edu/~barvinok/ *Abstract:* Partition functions are just multivariate polynomials with great many monomials enumerating combinatorial structures of a particular type and their efficient computation (approximation) are of interest for combinatorics, statistics, physics and computational complexity. I’ll present a general principle: the partition function can be efficiently approximated in a domain if it has no complex zeros in a slightly larger domain, and illustrate it on the examples of the permanent of a matrix, the independence polynomial of a graph and, time permitting, the graph homomorphism partition function. *Bio:* Alexander Barvinok is a professor of mathematics at the University of Michigan, Ann Arbor. He is interested in computational complexity and algorithms in algebra, geometry and combinatorics. _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

6 years, 7 months

[Aspuru-Guzik Group List] April 5, 2017-Chris Monroe-HQOC/ITAMP Joint Quantum Sciences Seminar

by Ploucha, Clare

HQOC/ITAMP Joint Quantum Sciences Seminar Wednesday, April 5, 2017 4:00 PM, Jefferson 250 Prof. Chris Monroe, JQI and University of Maryland “Building a Quantum Computer, Atom by Atom” Laser-cooled and trapped atomic ions are standards for quantum information science, acting as qubits with unsurpassed levels of quantum coherence while also allowing near-perfect measurement. When qubit state-dependent optical forces are applied to a collection of ions, their Coulomb interaction is modulated in a way that allows entanglement operations that form the basis of a quantum computer. Similar forces allow the simulation of quantum magnetic interactions, and recent experiments have implemented tunable long-range interacting spin models with up to 40 trapped ions. Scaling to even larger numbers can be accomplished by coupling trapped ion qubits to optical photons, where entanglement can be formed over remote distances for applications in quantum communication, quantum teleportation, and distributed quantum computation. By employing such a modular and reconfigurable architecture, it should be possible to scale up ion trap quantum networks to useful dimensions, for future quantum applications that are impossible using classical processors. Student Presentation by Alexander Keesling from 4:00-4:10 PM Refreshments Served from 4:10-4:30 PM Guest Presentation from 4:30-6:00 PM -- Clare Ploucha Faculty Assistant to Professors Lukin & Greiner and their labs Department of Physics 17 Oxford St., Lyman 324A Cambridge, MA 02138 P. (617) 496-2544

7 years

[Aspuru-Guzik Group List] Group meeting Thursday at 1:30

by Ian Kivlichan

Hi all, Just a heads up that group meeting this week will start at 1:30 (rather than the usual 3:30) to accommodate the NSF postdoc talk on funding opportunities. We'll still be in the Div Room. All the best, Ian

7 years

[Aspuru-Guzik Group List] FW: [rle-admins] FW: FW: Please share: Wednesday, March 29th 4pm Room 3-270- New Approaches for Using III-V Compound Semiconductors- Dr. Jongseung Yoon- Refreshments provided

by Catherine M Bourgeois

[color_print] Micro-nano Seminar Series ________________________________ Wednesday, March 29, 2017 4:00 pm - Room 3-270 Dr. Jongseung Yoon Department of Chemical Engineering and Materials Science Department of Electrical Engineering University of Southern California New Approaches for Using III-V Compound Semiconductors in Photovoltaic and Photoelectrochemical Solar Energy Conversion Abstract Due to their highly favorable materials properties such as direct bandgap, appropriate bandgap energy against solar spectrum, and high electron mobilities, epitaxially grown III-V compound semiconductors have provided unmatched performance in solar energy harvesting. However, their large-scale deployment in terrestrial photovoltaics and solar fuel generation remains as a daunting challenge mainly due to the prohibitively high cost of growing device-quality epitaxial materials. In this regard, unconventional ways to exploit III-V compound semiconductors can create novel engineering designs, device functionalities, and cost structures, each with significant values in the next generation solar energy conversion technologies. In the first part of my talk, I will provide an overview of recent advances in materials design and fabrication concepts towards cost-efficient III-V photovoltaic systems based on multilayer-grown, ultrathin, nanostructured GaAs solar cells. Hexagonally periodic TiO2 nanoposts directly implemented on the window layer of GaAs solar cells served as a lossless diffractive coating for antireflection, diffraction, and light trapping in conjunction with a co-integrated back-surface reflectors, providing 20.8% one-sun efficiency with solar cells that have the thickness of active layer (emitter + base = 300 nm) more than 10 times thinner than conventional devices. In the second part, I will present a type of III-V photoelectrode systems for solar fuel generation based on heterogeneously integrated assemblies of epitaxially grown III-V materials. Specialized epitaxial design together with a bifacial electrode configuration decoupling optical and reactive interfaces enabled facile, independent control and optimization of light absorption, carrier transport, charge transfer, and materials stability in GaAs-based photoelectrodes, allowing for high efficiency (~13.1% STH), long lifetime (~ 8 days) operation of solar-driven water splitting for hydrogen generation. Biography [cid:image005.jpg@01D2A87B.283F5A50]Dr. Jongseung Yoon is an assistant Professor in the Mork Family Department of Chemical Engineering and Materials Science at the University of Southern California. He received a Ph.D. degree in Materials Science and Engineering from the Massachusetts Institute of Technology in 2006, and B.S. degree in Polymer Science from Seoul National University in 1996, respectively. Prior to joining USC, Prof. Yoon was a Beckman Institute Postdoctoral Fellow at the University of Illinois at Urbana-Champaign. His current research focuses on tailoring and understanding novel electrical, optical, electrochemical, and thermal properties of nanostructured inorganic single-crystalline semiconductor materials and exploiting them as synergistic materials building blocks into unusual format device implementation in areas ranging from photovoltaics, photoelectrochemical water splitting, to flexible/stretchable optoelectronics for skin-mountable/implantable sensing and therapeutic systems. Prof. Yoon is a recipient of DARPA Young Faculty Award in 2012 and Hanwha Non-Tenure Faculty Award in 2015. ________________________________ Host: Prof. Jeehwan Kim *Please email Prof. Kim at jeehwan(a)mit.edu<mailto:jeehwan@mit.edu> if you have any questions regarding this seminar. Refreshments provided. Thank you, Emilie Heilig Massachusetts Institute of Technology 77 Massachusetts Ave, 3-359 (32 Vassar St, 3-359 for packages) Cambridge, MA 02139 P: 617-253-2883

7 years

[Aspuru-Guzik Group List] ra_ls Nature Research Seminar by Sir Philip Campbell, Editor-in-Chief, Nature - April 11, 9-11 am

by Catherine M Bourgeois

Nature Research Seminar with guest speaker Sir Philip Campbell, Editor-in-Chief of Nature Speaker: Sir Philip Campbell, Editor-in-Chief, Nature Date: Tuesday, April 11, 2017 Time: 9:00a-11:00a Location: MIT, Stata Center, 32-123<http://whereis.mit.edu/map-jpg?mapterms=32-123&mapsearch=go> Sponsored by: MIT Global Education & Career Development and the Office of the Vice President for Research RSVP: Web site for Registration<https://docs.google.com/forms/d/1l_4HP7-HEf9uDY78kshBa4iC67SQSywUM5OOFBi-GW…> or email partnerships(a)nature.com<mailto:partnerships@nature.com> The seminar will be a talk and Q & A about the lab and research group management challenges for aspiring and current Principal Investigators and researchers and the support that they might increasingly need in publishing. Faculty, postdocs and other researchers, and students are welcome. Sponsored by The seminar will cover key issues as it relates to: 1. Publication of papers: coping with editors and referees, the paper of the future 2. Post-publication pressures 3. Lab integrity 4. Data 5. (Ir)reproducibility 6. Escape from the Impact factor! 7. Engaging with partner agencies in applicable research 8. Aspects of outstanding mentoring 9. Addressing examples of good practice and good techniques for coping with these issues About Sir Philip Campbell, Editor-in-Chief, Nature Sir Philip Campbell is Editor-in-Chief of Nature and of Nature Research. His areas of responsibility include the editorial content of Nature, and assuring the long-term quality of all Nature publications. He has a BSc in aeronautical engineering, an MSc in astrophysics and a PhD and postdoctoral research in upper atmospheric physics. Following his research, he became the Physical Sciences Editor of Nature and then, in 1988, the founding editor of Physics World, the international magazine of the UK Institute of Physics. He returned to Nature to take on his current role in 1995. He has worked with the UK Office of Science and Innovation, the European Commission and the US National Institutes of Health on issues relating to science and its impacts in society. For ten years until 2012 he was a trustee of Cancer Research UK. He is a founding trustee and now the Chair of the research funding charity 'MQ: transforming mental health'. He is a Fellow of the Royal Astronomical Society and a Fellow of the Institute of Physics, and was awarded an honorary DSc by Leicester University and Bristol University, and an Honorary Professorship by the Peking Union Medical College. He is a Life Member of Clare Hall, Cambridge University. Sir Campbell is based in London. See the attached flyer. For more information, contact: partnerships(a)nature.com<mailto:partnerships@nature.com>

7 years

[Aspuru-Guzik Group List] THEOCHEM: Adam Willard, next Wednesday

by Romero Fontalvo, Jhonathan

Hi all, Professor Adam Willard from MIT (http://willardgroup.mit.edu/index.html) will be visiting our group next Wednesday, March 29th, as part of the Theochem lecture series. His research focuses on the application of quantum dynamics and statistical mechanics to understand how disorder impacts the properties of light-harvesting materials, water interfaces and polymers. He is also interested in the chemical dynamics of aqueous electrode interfaces. *Please contact me in your are interested in lunch, dinner or a meeting slot. *For all of you planning to become faculty, this is a great opportunity to talk to a young faculty member. Cheers, Jhonathan *Abstracts.* P*art I: “Nanoscale Disorder Drives the Dynamics of Excitons in Molecular Semiconductors"* Many organic electronic materials are composed of soft condensed matter that is both electronically active and disordered on the nanoscale. The electronic properties of these materials can depend sensitively on the details of molecular morphology, reflecting a complex coupling between excited electrons and the disordered nuclear environment. To better understand this coupling and how nanoscale disorder affects the electronic dynamics in these materials we utilize numerical simulation. In this talk I describe our approach to unraveling the effects of nanoscale disorder on the dynamics of excitons, which utilizes atomistic simulation, coarse-grained models, and quantum dynamics. *Part II: "What Can Interfacial Water Molecules Tell Us About Solute Structure?”* The molecular structure of bulk liquid water reflects a molecular tendency to engage in tetrahedrally coordinated hydrogen bonding. At a solute interface water’s preferred three-dimensional hydrogen bonding network must conform to a locally anisotropy interfacial environment. Interfacial water molecules adopt configurations that balance water-solute and water-water interactions. The arrangements of interfacial water molecules, therefore encode information about the effective solute-water interactions. This solute-specific information is difficult to extract, however, because interfacial structure also reflects water’s collective response to an anisotropic hydrogen bonding environment. Here I present a methodology for characterizing the molecular-level structure of liquid water interface from simulation data. This method can be used to explore water’s static and/or dynamic response to a wide range of chemically and topologically heterogeneous solutes such as proteins. -- Jonathan Romero Fontalvo *Ph.D. Student in Chemical Physics* *Harvard University* Website: https://sites.google.com/site/jonathanromeroswebsite/

7 years

[Aspuru-Guzik Group List] [qip] no group meeting tomorrow or next week

by Aram Harrow

Dear quanta, Next week is spring break and I think many of you will already be away tomorrow. So we won't meet tomorrow or next week. -aram _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

7 years

[Aspuru-Guzik Group List] Card - War Room

by Felixander Negron

Hello everyone, For those of you that do not know, we recently found out that Joe Lavin had a death in the family. We purchased a card to give him from our group and I will be placing it in the war room. If you would like to pass by and sign it, please feel free to do so. Thanks, Felix *Felixander Negron* *Laboratory Administrator * *Aspuru-Guzik Group* *Harvard University **Department of Chemistry and Chemical Biology* *12 Oxford St. M 136* *Cambridge, MA 02138* *P:** (617) 496-9964** F: **617-496-9411*

7 years

[Aspuru-Guzik Group List] No group meeting today

by Ian Kivlichan

Hi all, Just a heads up that there will be no group meeting today - please focus on G0 events :) All the best, Ian

7 years

[Aspuru-Guzik Group List] TODAY-Randall Hulet-HQOC/ITAMP Joint Quantum Sciences Seminar

by Ploucha, Clare

HQOC/ITAMP Joint Quantum Sciences Seminar Wednesday, March 22, 2017 4:00 PM, Jefferson 250 Prof. Randall Hulet, Rice University “Pairing of Spin Polarized Fermi Gases” Ultracold atomic gases are versatile platforms for realizing novel many-body states of matter by virtue of the ability to tune parameters such as interaction, density, dimensionality, and spin-polarization. I will describe experiments that have produced phase diagrams of spin-polarized Fermi gasses in 1D, 3D, and in the 1D-3D dimensional crossover. I will conclude with our progress to create the holy grail of this research, which is the observation of the “elusive” FFLO superfluid state, a state that exhibits coexisting magnetic and superconducting order. Dr. Rivka Bekenstein, ITAMP "Optical Simulations of the Newton-Schrodinger System" Postdoc Presentation from 4:00-4:10 PM Refreshments Served from 4:10-4:30 PM Guest Presentation from 4:30-6:00 PM -- Clare Ploucha Faculty Assistant to Professors Lukin & Greiner and their labs Department of Physics 17 Oxford St., Lyman 324A Cambridge, MA 02138 P. (617) 496-2544

7 years

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aspuru-list March 2017