aspuru-list June 2012

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13 participants
29 discussions

[Aspuru-Guzik group list] [qip] Fwd: Microsoft Research New England Weekly Event Digest

by Edward Farhi

> > > Microsoft Research New England Weekly Event Digest > > Here is a digest of the upcoming seminar sponsored by the Microsoft Research New England Lab: > > Theory Colloquium: Quantum Hamiltonian Complexity -- Umesh Vazirani, Berkeley | Wed June 13 @ 4 PM > > ARRIVAL GUIDANCE: > Upon arrival, be prepared to show a picture ID and sign the Building Visitor Log when approaching the Lobby Floor Security Desk. Alert them to the name of the MSR event you are attending and ask them to direct you to the appropriate floor. Typically the talks are located in the First Floor Conference Center, however sometimes the location may change. > > More details follow: > > ****************************************************************************************************************************** > ****************************************************************************************************************************** > WHO: Umesh Vazirani > AFFILIATION: Berkeley > TITLE: Quantum Hamiltonian Complexity > HOST: Madhu Sudan > WHEN: Wednesday June 13th > WHERE: Microsoft Conference Center located at One Memorial Drive, First Floor, Cambridge, MA > TIME: 4:00 PM – 5:30 PM > ****************************************************************************************************************************** > > Abstract > We consider three basic questions about quantum mechanics: > 1. Do `typical' quantum states that occur in Nature have succinct (polynomial) description? > 2. Can quantum systems at room temperature exhibit exponential complexity? > 3. Is the scientific method sufficiently powerful to comprehend general quantum systems? > Each of these questions is best studied through a computational lens as a question > about computation. The resulting questions lie at the core of theory. The first asks > about the structure of solutions to the quantum analog of SAT. The second asks > whether there is a quantum analog of the PCP theorem. And the third can be > formulated as a question about interactive proof systems with BQP provers. > In this talk I will describe recent progress on these issues. > > Biography > Umesh Vazirani received his B.Tech. in computer science from MIT in 1981 and his Ph.D. in computer science from U.C. Berkeley in 1986. He is currently professor of computer science at U.C. Berkeley and director of BQIC -the Berkeley center for Quantum Information and Computation. Prof. Vazirani is a theoretician with broad interests in novel models of computation. He has done seminal work in quantum computation and on the computational foundations of randomness. He is the author of two books "An introduction to computational learning theory" with Michael Kearns and "Algorithms" with Sanjoy Dasgupta and Christos Papadimitriou. > ****************************************************************************************************************************** > ****************************************************************************************************************************** > > ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Edward Farhi Cecil and Ida Green Professor of Physics Director Center for Theoretical Physics Massachusetts Institute of Technology 6-300 Cambridge MA 02139 617 253 4871 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

11 years, 10 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] AMP Seminar Wednesday June 13, Ed Narevicius (Weizmann Institute of Science), Reactive scattering at 10 mK: Observation of orbiting resonances

by James F. Babb

Please join us for an informal seminar sponsored by the Atomic and Molecular Physics Division, Harvard-Smithsonian Center for Astrophysics. (Complete schedule at http://www.cfa.harvard.edu/amp/events.html) 11:00 AM Wednesday, June 13, 2012 Phillips Auditorium 60 Garden St, Cambridge, MA Reactive scattering at 10 mK: Observation of orbiting resonances Ed Narevicius (Weizmann Institute of Science) There is a fundamental interest in observation and study of resonances in atom and molecule scattering. Resonances probe fine details of interaction potentials and dominate collision dynamics at low temperatures. Quasibound resonances states are formed in the continuum part of spectrum making them accessible to scattering experiments where collision energy can be tuned, similarly to detection of bound states by tuning the excitation frequency in spectroscopy measurements. We report the first observation of orbiting resonances in the Penning ionization reaction of argon and molecular hydrogen with metastable helium atoms. Our result is the first direct measurement of a sharp increase in the absolute reaction rate due to the formation of metastable collision complex by quantum tunneling. In our approach we were able to break the barrier of 1 K collision temperature by merging two fast supersonic beams. As a result the relative velocity vanishes in a moving frame of reference. We use the Zeeman effect on paramagnetic species in order guide them in a section of a curved magnetic quadrupole guide. At the quadrupole exit paramagnetic particles beam merges with another supersonic beam that travelled straight from a separate supersonic source. By varying the relative velocities we continuously tune collisional energies from 700 K down to 10 mK which allows us the observation of resonances at low temperatures. _______________________________________________ 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, 10 months

[Aspuru-Guzik group list] [qip] informal meeting

by Edward Farhi

Hi Quanta We will have an informal meeting on Friday (tomorrow) at 2:00. We can catch up with each other. Best, Eddie ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Edward Farhi Cecil and Ida Green Professor of Physics Director Center for Theoretical Physics Massachusetts Institute of Technology 6-300 Cambridge MA 02139 617 253 4871 ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

11 years, 10 months

[Aspuru-Guzik group list] Group meeting this Friday by Joon

by Ryan Babbush

Hi Everyone, This Friday at 2pm in the Division room Joon will be giving group meeting. An abstract of Joon's talk is below. See you there! ------------------------------------------------------------------------------------------------------------- "Exponential time propagators for large exciton systems" Joonsuk Huh In solving the time-dependent Schrödinger equation, one usually needs to compute or approximate an exponential of Hamiltonian matrix in a finite basis set as a corresponding time propagator. As the system size increases, this matrix function becomes more difficult to be evaluated exactly within a finite numerical precision and this gives limitations on the time step size and the total time length for the time propagation. To see the long time behaviour of wave functions for the large systems, efficient methods for the matrix exponential are demanding. In my group meeting talk, I will explain the evaluation of the exponential time propagator aiming for the photosynthetic roll and baseplate system in the exciton basis. -------------------------------------------------------------------------------------------------------- -- 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

11 years, 10 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] AMP Seminar Thursday June 7, Jon Tandy (Caltech). Near-IR imaging and UV-Vis spectroscopy of high-speed ejecta using the Caltech hypervelocity impact range

by James F. Babb

Please join us for an informal seminar sponsored by the Atomic and Molecular Physics Division, Harvard-Smithsonian Center for Astrophysics. (Complete schedule at http://www.cfa.harvard.edu/amp/events.html) 2:00 PM Thursday, June 7, 2012 Phillips Auditorium 60 Garden St, Cambridge, MA Near-IR imaging and UV-Vis spectroscopy of high-speed ejecta using the Caltech hypervelocity impact range Jon Tandy (Caltech) The Small Particle Hypervelocity Impact Range (SPHIR) facility at the California Institute of Technology recently added two spectrographs coupled with high-speed cameras to measure short-lived (~20 microsec) ejecta emission. Currently, this facility utilizes a 1.8 mm bore, two-stage light-gas gun to launch 5.2 mg nylon 6/6 impactors into 15 x15 cm aluminum targets at typical speeds ranging from 5-7 km/s. The facility now features a comprehensive set of in situ diagnostics that enable simultaneous observation of various phenomena in each experiment. High-speed photography is used to determine impact speed in each experiment. A second high-speed camera is used to implement an optical technique that creates "shadowgraph" images of the impact phenomena (front ejecta and debris cloud behind the target). The aforementioned spectrograph/camera systems are able to record either a single image or spectrum of the impact ejecta emission. Preliminary results from the near-IR imaging show an emitting ejecta "cloud" expanding from the impact site followed by a second, darker region of expanding material. UV-vis spectroscopy measurements of the emitting ejecta show several strong molecular emission bands between 380 nm and 650 nm. Preliminary assignments of these spectral bands show evidence of small molecular fragments originating from both the projectile and target material. _______________________________________________ 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, 11 months

[Aspuru-Guzik group list] Greater Boston TheoChem Seminar Series

by Johannes Hachmann

Hi everybody, As you probably know, the Aspuru-Guzik Group has spearheaded the organization of the Harvard side of the Greater Boston TheoChem Seminar Series over the past years. Now that Joel and Roberto have retired from their duties (a big thanks to them!), there is Stephanie, Jarrod, and me left from last year's crew. Please let me know if you want to become involved in the organization of this seminar series. We'll have our planning meeting for the 2012/13 season on Thursday, 7pm in John Harvard's. Cheers Johannes ----------------------------------------------- Dr. Johannes Hachmann Postdoctoral Fellow Aspuru-Guzik Research Group Harvard University Department of Chemistry and Chemical Biology 12 Oxford St, Rm M104A Cambridge, MA 02138 USA eMail: jh(a)chemistry.harvard.edu -----------------------------------------------

11 years, 11 months

Re: [Aspuru-Guzik group list] Looking for a C++ tutor

by Stopa, Michael

Hi Ed, I might think that HUIT over in the Science Center is a good place to look. It might be that some of the undergraduates working for the summer might know C++ and be willing to teach it. But for the moment I am forwarding this to the Aspuru-Guzik group (apologies to the group for blasting this). A-G gang: anyone over there want to make a few dollars helping Ed from CNS? Ed: let me know if you get any responses or not. Best, Mike From: Macomber, Ed Sent: Saturday, June 02, 2012 8:25 PM To: Stopa, Michael Subject: Looking for a C++ tutor Hi Mike, I'm taking a C++ class that I need for my Mech Eng. degree at NEU. I need some help for a 1/2hr or so maybe once or twice a week for the next 5 weeks. Vincenzo mentioned that you may know some of the students you work with that could help me out; I'm willing to pay whatever the going tutor rate is. Do you know anyone that would be willing to help? Thanks, Ed Macomber Senior Technician Center for Nanoscale Systems Harvard University Faculty of Arts and Sciences 11 Oxford Street, LISE G44 Cambridge, MA 02138

11 years, 11 months

[Aspuru-Guzik group list] Fwd: Odyssey /n/data Retirement

by Sule Atahan-Evrenk

Dear All, in case you have missed this announcement. as of now, n/data/ is still mounted... best, s. ---------- Forwarded message ---------- From: Paul Edmon <pedmon(a)cfa.harvard.edu> Date: Thu, May 10, 2012 at 1:53 PM Subject: Odyssey /n/data Retirement To: Cc: "rcops (rcops-list(a)lists.fas.harvard.edu)" < rcops-list(a)lists.fas.harvard.edu> We are going to be retiring /n/data after many years of service due to rack space needs and aging hardware. As those of you still using /n/data already know it has been read only for well over a month now in preparation for the shutdown. The retirement will occur on June 1st when it will be unmounted from the cluster. If you have data you care about on /n/data we recommend you move it as soon as possible to a new location. We do not have a replacement for /n/data so if you need to preserve the data it will have to be on existing hardware. Any data not moved from /n/data will be lost. We do not have a backup for it. Let RC Help know if you have any questions or concerns. Thanks. -Paul Edmon- Research Computing Associate Harvard University

11 years, 11 months

[Aspuru-Guzik group list] Fwd: position opening at RHUL

by sarah mostame

------ Sarah Mostame, Ph.D. Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street, Room M104 Cambridge, MA 02138 email: mostame(a)fas.harvard.edu http://aspuru.unix.fas.harvard.edu/People/Sarah_Mostame/ a new Lecturer / Senior Lecturer position has recently been announced at Royal Holloway University of London. The deadline to apply is the 31st of July 2012. Further information can be found at: http://www.jobs.ac.uk/job/AEN169/lecturer-senior-lecturer-in-theoretical-co…

11 years, 11 months

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aspuru-list June 2012