aspuru-list January 2013

aspuru-list@lists.fas.harvard.edu

29 participants
51 discussions

[Aspuru-Guzik group list] Fwd: Glasses found

by Cynthia M. Chew

Hi group, If you have lost a pair of glasses recently, please see Susan Kinsella in the front office. Thanks, Cynthia ---------- Forwarded message ---------- From: Kinsella, Susan <kinsella(a)chemistry.harvard.edu> Date: Tue, Jan 22, 2013 at 9:34 AM Subject: Glasses found To: "Morrison, Judy" <morrison(a)chemistry.harvard.edu>, Aspuru-Assistant < aspuru.assistant(a)gmail.com> Cc: "Schwickrath, Helen" <schwickrath(a)chemistry.harvard.edu> Good morning Judy and Cynthia,**** ** ** A pair of eye glasses were found in the Division Room this morning. I thought I’d let you know since your groups use that room the most.**** ** ** Best,**** ** ** Susan **** ** ** ~~~~~~~~~~~~~~~~~~~~~**** Susan M. Kinsella**** Assistant to the Chair and **** the Saghatelian Lab**** ** ** Chemistry & Chemical Biology**** Mallinckrodt 132**** 12 Oxford St.**** Cambridge, MA 02138**** ** ** 617-496-4088**** Fax: 617-4965618**** ** **

11 years, 3 months

[Aspuru-Guzik group list] ITAMP topical lunch discussion: Thursday January 24 @ 12:00

by Mikhail Lemeshko

Dear Friends, On Thursday, January 24, there will be an ITAMP topical lunch discussion. Tea Room (P-226) @ CfA (60 Garden Street) Time: 12:00-1:30 As always pizza will be served. Speaker: Michael Knap Title: Time dependent impurities in ultracold quantum gases: exploring universal quantum dynamics Abstract: The physics of impurities in metals and mesoscopic structures provided a deeper understanding of electrical and thermal transport properties, guided the development of new mathematical techniques, and gave useful insights into the behavior of more complicated strongly correlated materials. Ensembles of ultracold atoms offer new opportunities to study impurity physics in a well isolated, coherent setting with relatively slow time scales, that can be faithfully determined by a small number of precisely controllable parameters, and come with a rich experimental toolbox allowing for a detailed characterization of the system. In this talk, we outline a program of how to explore quantum impurity problems with ultracold atoms. In particular, we reconsider the classic problem of the orthogonality catastrophe, which describes the dynamics of a localized impurity in a Fermi sea. We present its complete solution, discover new qualitative features which could not be observed in metallic systems, and discuss the effect of interactions. In the second part of this talk we study fast impurities in correlated quantum gases, which feature a novel collective state manifesting for example in coherent oscillations of the impurity momentum – a phenomenon known as quantum flutter. We demonstrate the existence of quantum flutter beyond integrability, which suggests that its physics is of universal character. Looking forward to seeing you there, Misha Lemeshko -- Dr. Mikhail Lemeshko Institute for Theoretical Atomic, Molecular, and Optical Physics (ITAMP) Harvard-Smithsonian Center for Astrophysics MS-14 60 Garden St. Cambridge, MA 02138 U.S.A. mlemeshko(a)cfa.harvard.edu http://sites.google.com/site/mishalemeshko/ Tel. +1 (617) 496-7610 Fax +1 (617) 496-7668

11 years, 3 months

[Aspuru-Guzik group list] [IACS-events] Reminder and room change: "100 Years of Markov Chains" tomorrow 1/23

by Reid, Rosalind

A reminder of tomorrow morning's IACS event, a trio of talks celebrating the history, intellectual power and scientific applications of Markov chains. Please note that we've moved the event to a larger room, Maxwell Dworkin G115. WHAT: 100 Years of Markov Chains, a centenary celebration WHEN: Wednesday, Jan. 23, 9:15 am - 12:15 pm WHERE: Maxwell Dworkin G115, 33 Oxford Street **ROOM CHANGE** PROGRAM AND SPEAKER INFORMATION: http://computefest.seas.harvard.edu/markov This public event is part of ComputeFest 2013. The presentations below will begin at 9:15, 10:15 and 11:15, respectively. Coffee and light refreshments will be provided. PROGRAM "First Links in the Markov Chain: Poetry and Probability" Brian Hayes Senior Writer, American Scientist magazine Abstract: On January 23, 1913, the Russian mathematician A. A. Markov presented a paper at the Imperial Academy of Sciences in St. Petersburg describing his careful enumerations of vowels and consonants in Alexander Pushkin's poem Eugene Onegin. A century later, the techniques that Markov discussed that day are in daily use everywhere in statistics and scientific computing. We call them Markov chains. On the occasion of this hundredth anniversary, I want to consider what motivated Markov's work in this area, and how he came to illustrate his mathematical ideas with an analysis of poetic language. I will go on to discuss a few latter-day applications of Markov chains in linguistics, including the mass production of random prose meant to foil your spam filter. ----- "From Markov to Pearl: Conditional Independence as a Driving Principle for Probabilistic Modeling" Ryan Prescott Adams Assistant Professor of Computer Science, SEAS Abstract: The Markov chain is one of the fundamental abstractions for consideration of stochastic systems. The remarkable insight of Markov was that complex phenomena can be described by the evolution of a "memoryless" system. Markov chain theory has had an enormous impact on probabilistic computation, natural language processing, and information theory, among many other fields. In recent decades, Judea Pearl and others recognized that this notion of "conditional independence" could be used more broadly to define rich classes of probability distributions for complex natural phenomena. I will give an overview of how these ideas connect strongly with graph theory, leading to the concept of a probabilistic graphical model, a centerpiece of modern machine learning and statistics. ----- "Applications of Markov Chains in Science" Pavlos Protopapas Research Associate, Harvard-Smithsonian Center for Astrophysics; Lecturer in Computational Science, SEAS Abstract: The Markov chain and its extension, Markov Chain Monte Carlo, are among the most used algorithms in the sciences. These methods have transformed the way we do science in the last twenty years. In the first part of this talk I will introduce the basic ideas behind these methods and demonstrate them with simple examples: a drunk walking along a pavement, a mutating virus, card shuffling and so on. I will then review applications of Markov chains in various sciences, describing the latest developments and looking toward how Markov's insight might continue to shape computational science in the future. ********************** REMAINING COMPUTEFEST 2013 PUBLIC EVENTS: COMPUTATIONAL SCIENCE VENTURES: Innovators explore the frontier where computation and science meet entrepreneurship and opportunity. Featuring Dan Cerutti, General Manager of Watson Commercialization, IBM; Alex Onik, President, ScienceGL, on scientific visualization; Ben Vigoda, General Manager and Technical Director, Analog Devices Research Labs, on statistical machine learning, artificial computing systems and the physics of computing. Organized and moderated by Alexander Wissner-Gross. Thursday, Jan. 24, 9 am-noon, in Maxwell Dworkin G115. Details: http://computefest.seas.harvard.edu/computational-science-ventures EXASCALE SYMPOSIUM: Computing @ Exascale, the Second Annual Symposium on the Future of Computation in Science and Engineering, Friday, Jan. 25, 9:30 am-5 pm, in Maxwell Dworkin G115. Keynote by David E. Shaw. Details: http://computefest.seas.harvard.edu/exascale-symposium ----------------- Rosalind Reid Executive Director, Institute for Applied Computational Science Harvard School of Engineering and Applied Sciences Pierce Hall, 29 Oxford Street Cambridge, MA 02138 http://iacs.seas.harvard.edu/people rreid(a)seas.harvard.edu | 617-384-9091 _______________________________________________ Iacs-events mailing list Iacs-events(a)seas.harvard.edu https://lists.seas.harvard.edu/mailman/listinfo/iacs-events _______________________________________________ Iacs-events mailing list Iacs-events(a)seas.harvard.edu https://lists.seas.harvard.edu/mailman/listinfo/iacs-events

11 years, 3 months

[Aspuru-Guzik group list] ITAMP/HQOC Special Seminar - Lara Faoro - 1/18/2013, Lyman 425 at 11:00 AM

by Hamilton, Joan

***HQOC/ITAMP Special Seminar*** ***Friday, January 18, 2013*** ***11:00 AM, Lyman 425*** Lara Faoro, Rutgers, The State University of New Jersey "Internal Loss of Superconducting Resonators Induced by Interacting Two Level Systems (TLS)"

11 years, 3 months

[Aspuru-Guzik group list] today: TedX talk on emotional/subjective side of doing science

by Adrian Jinich

Hi Lab, Here's a somewhat different science-related talk I wanted to share. My personal scientific hero, physicist-turned-system-biologist Uri Alon from the Weizmann Institute, will be giving a TedX in Laussane today entitled: "Together into the unknown: What science can learn from improvisation theatre" It should be good. There are two sessions: one 7:40-9:30, the other from 11:00-1:00. I still don't know when he's on, but it will be streamed live at http://www.tedxlausanne.org/event/streaming To see some of Uri's talks on related topics see, for example: https://www.youtube.com/watch?v=HDcgWtfoKy4 To read Uri's writings on related topics. see, for example, http://www.cell.com/molecular-cell/abstract/S1097-2765(09)00641-8 should be good, adrian

11 years, 3 months

[Aspuru-Guzik group list] Fwd: CMT SEMINAR: Lev Ioffe, Rutgers, 1/17/2013 at 4:00 PM, Lyman 425

by Joan Hamilton

> Refreshments will be served > > Harvard University > Department of Physics > Condensed Matter Physics Seminar > > > Thursday 17 Jan > 4:00pm, Lyman 425 > > > LEV IOFFE > Rutgers University > > > "Error Correction and Topological Protection of Quantum Coherence" > > I compare the software approach to the error correction in quantum computation to the hardware one in which the protection from errors is due to a proper choice of the microscopic Hamiltonian. I show that devices implementing mathematical error correction at the physical level are characterized by topological order parameter. I discuss the Josephson circuits that might realize the idea of topological order parameter and thus error correction at the physical level, in particular circuits in which two protected states differ by the parity of a large integer number. Depending on implementation, this integer number can be either the number of Cooper pairs on an island or a number of fluxes in a loop. > > > > This Seminar is supported by the Harvard Quantum Optics Center > >

11 years, 3 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] group meeting this Friday

by Ryan Babbush

Hey Everyone, The time has come for me, Ryan Babbush, the group meeting announcer, to give group meeting. This Friday at 2:30 I'll be explaining work that John Parkhill and I have been doing regarding the use of functionals to cheaply reproduce results of path integral statistical mechanics. An abstract is provided below. ============================ Force-Field Functional Theory: A Uniqueness and Existence Proof for Classical Force-Fields which Reproduce Equilibrium Quantum Distributions Feynman and Hibbs were the first to variationally determine an effective classical potential which could be integrated classically to approximate the exact quantum partition function given by the path integral formulation of statistical mechanics. Since then, many have presented methods which more accurately approximate the effective classical potential and some of these approximations are used regularly for molecular dynamics. We prove that there always exists an unique operator which maps the classical potential to an effective classical potential which samples the exact quantum ensemble equilibrium density and all related equilibrium averages. Furthermore, we show that this operator is a linear operator to at least second order in the potential. These result suggests a systematic avenue for finding "force-field functionals" with a motivation similar in spirit to the powerful ideas and approximations stemming from density functional theory. -- Ryan Babbush | PhD Student in Chemistry (949) 331-3943 | babbush(a)fas.harvard.edu Harvard University | Aspuru-Guzik Research Group 12 Oxford Street, Box 400 | Cambridge, MA 02138 _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

11 years, 3 months

[Aspuru-Guzik group list] Meet with Prof. Xiaoyang Zhu, Columbia University

by Cynthia M. Chew

Hi Group, Prof. Xiaoyang Zhu (http://zhu.cm.utexas.edu/) is visiting from Columbia University on Thurs, Jan 17. If anyone is interested in meeting with him in the afternoon please let me know today and I'll reserve a time slot for our group. Thanks, Cynthia Cynthia M. Chew Faculty Assistant | Aspuru-Guzik Research Group Department of Chemistry and Chemical Biology | Harvard University 12 Oxford Street | Cambridge, MA 02138 617.496.1716 office | 617.496.9411 fax http://aspuru.chem.harvard.edu/

11 years, 3 months

[Aspuru-Guzik group list] talk of Alex Eisfeld today at 4pm in M217

by Semion Saikin

Dear Group, This is a reminder that today at 4pm Dr. Alex Eisfeld will tell us about: ** *Dynamics of a nano-scale rotor driven by single-electron tunneling* Please notice the unusual location in the room M217 Thank you, Semion

11 years, 3 months

[Aspuru-Guzik group list] AAG Office Today!

by Marlon Cummings

Hello: Lovely morning to be outside! :) Today, the office be closed from 12:00 - 5:30 pm. All requests, inquiries, and correspondence will be answered tomorrow. However, we will be checking emailing intermittently. Thanks, Marlon. ------------------- Marlon G. Cummings Lab Manager, Aspuru-Guzik Group Mallinckrodt M112 Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge, MA 02138 617-496-9964 617-496-9411 (fax) http://aspuru.chem.harvard.edu/

11 years, 3 months

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aspuru-list January 2013