aspuru-list April 2012

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27 participants
60 discussions

[Aspuru-Guzik group list] [qip] thesis defense

by Ramis Movassagh

Hi all, I will be defending my thesis and it would be great to see you there. The details are: Space-time coordinates : Monday, April 23, 2012 at 11 am in room 4-159. Title : Eigenvalues and Eigenvectors of QMBS Abstract: The first part is devoted to eigenvalues of quantum many-body systems (QMBS). I introduce Isotropic Entanglement (IE) and show that the distribution of QMBS with generic interactions can be accurately obtained using IE. Next, I discuss the eigenvalue distribution of one particle hopping random Schr\"{o}dinger operator in one dimension from free probability theory. The second part is devoted to ground states and gap of QMBS. I first give the necessary background on frustration free Hamiltonians, real and imaginary time evolution of quantum spin systems on a line within MPS representation and the numerical implementation. I then prove the degeneracy and unfrustration condition for quantum spin chains with generic local interactions. Lastly, I discuss a measure zero example (i.e., $d=3$) which is a frustration free translation-invariant spin-1 chain that has a unique highly entangled ground state and exhibits some signatures of a critical behavior. See you then and there! Ramis _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

12 years

[Aspuru-Guzik group list] group meeting today by Christoph Kreisbeck

by Stéphanie Valleau

Hi everyone, We have group meeting today at 1.30pm in the division room. *What:* Christoph Kreisbeck from the University of Regensburg will be giving a talk *Where: *Cabot division room* When: TODAY, Friday April 20th 1.30-2.30pm ** ** Abstract: Quantum transport through complex networks * There are di fferent regimes of quantum transport in complex networks ranging from purely coherent up to strongly dissipative dynamics. The latter regime is relevant for energy transfer in photosynthesis. Laser spectroscopy experiments by Engel et al. (Nature 2007) and also by Collini et al. (Nature 2010) suggest that quantum coherent e ffects may be essential in the energy transfer in light-harvesting complexes despite their high operating temperatures. To reproduce the experimental results, the diffculty is to bring together two seemingly con- tradictory experimental observations: (i) strong dissipation inducing fast thermalization and (ii) long lived coherence in cross peak oscillations of the 2d spectra. In this talk I show that the structure of the coupling to the protein vibrations has major ffects on the dynamics in 2d-spectra. Under realistic structured spectral densities, long lived electronic coherence and strong dissipation does coexist in the FMO light-harvesting complex. The numerical simulations of the 2d-spectra are done with the hierarchical equations of motion (HEOM) approach. We extend our GPU-HEOM, a graphics processing unit (GPU) implementation, to general structured spectral densities. Best, Stephanie **

12 years

[Aspuru-Guzik group list] [qip] today and next week

by Edward Farhi

Hi Quanta Greetings from Israel! Today, Friday, there is a group meeting at 11:00. I think we decided on a speaker but I forgot who it is. If it is you please identify yourself at the meeting. Next Wednesday Patrick Hayden is speaking at the String Theory Seminar at 2:15 in 6C-442. Next Wednesday Beni Yoshida is defending his thesis at 3:45 in 6C-442. Next Friday Patrick Hayden will come to our group meeting. 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

12 years

Re: [Aspuru-Guzik group list] [qip] tomorrow at 4

by Cedric Yen-Yu Lin

I forgot to specify the place: we'll probably meet at 6-310, but if that doesn't work out we'll try the Cosman Room. Cedric ________________________________________ From: Haidong Yuan [haidong.yuan(a)gmail.com] Sent: Thursday, April 19, 2012 6:48 PM To: Cedric Yen-Yu Lin Subject: Re: [qip] tomorrow at 4 Hi Cedric, where will it be? haidong On Thu, Apr 19, 2012 at 6:35 PM, Cedric Yen-Yu Lin <cedricl(a)mit.edu<mailto:cedricl@mit.edu>> wrote: Dear quanta, Prof. Wen has is giving a talk tomorrow (Friday) at 4. I hope to see you there. Best, Cedric _______________________________________________ qip mailing list qip(a)mit.edu<mailto:qip@mit.edu> http://mailman.mit.edu/mailman/listinfo/qip _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

12 years

[Aspuru-Guzik group list] [qip] tomorrow at 4

by Cedric Yen-Yu Lin

Dear quanta, Prof. Wen has is giving a talk tomorrow (Friday) at 4. I hope to see you there. Best, Cedric _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

12 years

[Aspuru-Guzik group list] Food in lounge

by Margaret Ronald

There's some tasty food in the lounge if anyone's interested! Thanks, -- Maggie Margaret Ronald 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/ Hours: Mon - Fri 1:00-5:00

12 years

[Aspuru-Guzik group list] Fwd: seminar today at 1pm you'll be interested in!

by Alan Aspuru-Guzik

-- Alan Aspuru-Guzik Associate Professor of Chemistry and Chemical Biology Harvard University http://aspuru.chem.harvard.edu Forwarded message: > From: Michael Aziz <aziz(a)seas.harvard.edu> > To: Alan Aspuru-Guzik <aspuru(a)chemistry.harvard.edu> > Date: Thursday, April 19, 2012 11:57:20 AM > Subject: seminar today at 1pm you'll be interested in! > > > > X-Mailman-Handler: $Id: mm-handler 2.1.10 2008-04-14 00:00:00 $ > > From: Barbara Sewall <sewall(a)seas.harvard.edu> > > To: thurs-seminar <thurs-seminar(a)seas.harvard.edu> > > Date: Wed, 18 Apr 2012 16:35:04 +0000 > > > > MATERIALS SCIENCE SEMINAR > > > > 1:00 P.M., Thursday, April 19th, 2012 > > The David Turnbull Room > > Gordon McKay Laboratory, Room 402 > > > > "SELF-ASSEMBLED ENERGY MATERIALS" > > > > Professor Ullrich Steiner > > Cavendish Laboratory, University of Cambridge > > > > Host: Joanna Aizenberg > > > > Abstract: Many materials for photovoltaics, batteries, supercapacitors, fuel cells rely on the detailed assembly of several components. Essential for these applications is not only the maximization of the surface-to-volume ratio but also the inter-connectivity of the constituent phases. Random assemblies of nanoscopic building blocks, while excelling in the first property, offer very little control over the detailed structure formation on the 10-nm length scale. > > > > The seminar talk will consist of two parts. The first part introduces several ways in which the self-assembly of block copolymers can be used to control the structure formation on the 10-nm-scale of organic, inorganic and organic/inorganic composite materials for the manufacture of solar cells and super-capacitors. The second part describes the interplay of polymer crystallization and demixing in polymer (P3HT/PCBM) solar cells and rationalizes the interplay of structure and function in these devices. > > _______________________________________________ > > thurs-seminar mailing list > > thurs-seminar(a)seas.harvard.edu > > https://lists.seas.harvard.edu/mailman/listinfo/thurs-seminar > _______________________________________________________________________ > Michael J. Aziz > Gene and Tracy Sykes Professor of Materials and Energy Technologies > Harvard School of Engineering and Applied Sciences > Pierce Hall 204a Tel: +1 (617) 495-9884 > 29 Oxford Street FAX: +1 (617) 495-9837 > Cambridge MA 02138 USA email: maziz(a)harvard.edu > http://seas.harvard.edu/matsci/people/aziz/aziz.html > _______________________________________________________________________

12 years

[Aspuru-Guzik group list] [qip] Thesis Defense

by Beni Yoshida

Hi everyone, I will defend my thesis on Date: Wednesday, April 25, 2012 Time: 3:45 - 5:00 PM Room: Cosman Seminar room 6C-442 Please find the title and the abstract below. I hope to see you there! Beni ------ Title: Studying many-body physics through classical and quantum coding theory Abstract: The emerging closeness between correlated spin systems and error-correcting codes enables us to address many-body physics problems through coding theoretical techniques. In this talk, I will demonstrate the usefulness of coding theory by giving solutions to the following two problems. (i) Fundamental limit on information storage capacity of discrete spin systems. (ii) Feasibility of self-correcting quantum memory and thermal stability of topological order at non-zero temperature. _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

12 years

[Aspuru-Guzik group list] [Aspuru-meetings-list] Meeting with Paul Brumer tomorrow

by Joel Yuen

Hi all, We'll have time for discussion with Paul Brumer tomorrow from 11:15 to 12:15 at the Cohen-Aspuru lounge. Whoever is interested please feel free to stop by. Also, those who signed up for lunch, we'll have it also in the same lounge. Best, -- Joel Yuen-Zhou PhD candidate in Chemical Physics Harvard University CCB, 12 Oxford St. Mailbox 107, Cambridge, MA, USA. _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

12 years

Re: [Aspuru-Guzik group list] My minestrone soup!

by abs.ccb＠gmail.com

Sweet! Thx P!! =D ------Original Message------ From: Patrick Rebentrost To: Anna Bell Shin Cc: A-G Group Subject: Re: [Aspuru-Guzik group list] My minestrone soup! Sent: Apr 18, 2012 7:43 PM Got it. PR On 4/18/2012 7:41 PM, abs.ccb(a)gmail.com wrote: > Dear Group, sorry for the spam but I just left office and forgot I microwave a thing of minestrone soup. Its probably still in there. If someone is walking by the kitchen, can you do me a solid and shove my soup in the fridge? I'd really appreciate it. Now I'm going to eat as I'm starving! :'( > Sent from my Verizon Wireless BlackBerry > _____________________________________________ > Aspuru-list mailing list > Aspuru-list(a)lists.fas.harvard.edu > https://lists.fas.harvard.edu/mailman/listinfo/aspuru-list Sent from my Verizon Wireless BlackBerry

12 years

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aspuru-list April 2012