aspuru-list May 2013

aspuru-list@lists.fas.harvard.edu

38 participants
92 discussions

[Aspuru-Guzik group list] Fwd: Aspuru-list post from vidick@csail.mit.edu requires approval

by Alan Aspuru-Guzik

Alán Aspuru-Guzik | Professor of Chemistry and Chemical Biology Harvard University | 12 Oxford Street, Room M113 | Cambridge, MA 02138 (617)-384-8188 | http://aspuru.chem.harvard.edu | http://about.me/aspuru ---------- Forwarded message ---------- From: <aspuru-list-owner(a)lists.fas.harvard.edu> Date: Thu, May 9, 2013 at 12:03 PM Subject: Aspuru-list post from vidick(a)csail.mit.edu requires approval To: aspuru-list-owner(a)lists.fas.harvard.edu As list administrator, your authorization is requested for the following mailing list posting: List: Aspuru-list(a)lists.fas.harvard.edu From: vidick(a)csail.mit.edu Subject: [qip] Fwd: TALK:Monday 5-13-13 Note -- Unusual day and time: QUANTUM HAMILTONIAN COMPLEXITY: THROUGH THE COMPUTATIONAL LENS Reason: Post by non-member to a members-only list At your convenience, visit: https://lists.fas.harvard.edu/mailman/admindb/aspuru-list to approve or deny the request. ---------- Forwarded message ---------- From: Thomas Vidick <vidick(a)csail.mit.edu> To: qip(a)mit.edu Cc: Date: Thu, 9 May 2013 08:59:38 -0700 Subject: [qip] Fwd: TALK:Monday 5-13-13 Note -- Unusual day and time: QUANTUM HAMILTONIAN COMPLEXITY: THROUGH THE COMPUTATIONAL LENS Should be of interest.... -------------------------------- Note -- Unusual day and time: QUANTUM HAMILTONIAN COMPLEXITY: THROUGH THE COMPUTATIONAL LENS Theory Colloquium 2012/2013 Speaker: Umesh Vazirani Speaker Affiliation: UC Berkeley Host: Constantinos Daskalakis and Dana Moshkovitz Host Affiliation: MIT CSAIL Date: 5-13-2013 Time: 3:45 PM - 4:15 PM Refreshments: 5:15 PM Location: 32-G882 (Hewlett); refreshments in G5 lounge Abstract: The exponential complexity of quantum systems is a double-edged sword: while making quantum computers possible it is also an enormous obstacle to analyzing and understanding physical systems. Is there any way around this curse of exponentiality? Here are three basic questions that explore this issue: 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 issues is best studied through the computational lens as a question about computation. The resulting questions lie at the core of computational complexity 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 quantum polynomial time provers. This is a very active area, with a number of recent breakthroughs and many exciting open questions. In this talk I will try to summarize the state of the art, while keeping the talk widely accessible. Relevant URL(S): http://toc.csail.mit.edu/?q=node/162 For more information please contact: Holly Jones, 617-253-6098, hjones01(a)mit.edu _______________________________________________ Seminars mailing list Seminars(a)lists.csail.mit.edu https://lists.csail.mit.edu/mailman/listinfo/seminars _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip ---------- Forwarded message ---------- From: aspuru-list-request(a)lists.fas.harvard.edu To: Cc: Date: Subject: confirm ad8f9ff842646265dfe6845515d2580cceb38977 If you reply to this message, keeping the Subject: header intact, Mailman will discard the held message. Do this if the message is spam. If you reply to this message and include an Approved: header with the list password in it, the message will be approved for posting to the list. The Approved: header can also appear in the first line of the body of the reply. V

10 years, 11 months

[Aspuru-Guzik group list] Jiri Vanicek visit

by Stéphanie Valleau

Dear group, Prof. Jiri Vanicek http://lcpt.epfl.ch/vanicek <http://lcpt.epfl.ch/vanicek>will be visiting Harvard next Monday May 13th as part of the CCB/ITAMP seminar series. He will be giving a talk from 2-3pm at the Phillips Auditorium, 60 Garden St (ITAMP), details of the talk to be announced. Also we are hosting him for lunch from 12-1.30pm in the division room. If you haven't met Jiri yet, he is a really nice/smart guy and definitely good to talk too. Please RSVP for the lunch by tomorrow morning. Thanks, Stephanie <http://lcpt.epfl.ch/vanicek>

10 years, 11 months

[Aspuru-Guzik group list] Cluster reset.

by Alan Aspuru-Guzik

Dear all, Kai and Carolina will be working on a couple nodes of the cluster and need the queue off. Please be forewarned that disruptions will / may occur as they cycle a couple of the nodes. Best, Alan -- Alan Aspuru-Guzik Professor of Chemistry and Chemical Biology Harvard University http://aspuru.chem.harvard.edu

10 years, 11 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] Seminar by Prof. Peter Bernath, "Molecular Astronomy: Cool stars, brown dwarfs and exoplanets", Monday, May 13

by Gonzalo Gonzalez Abad

Please join us for a seminar sponsored by the Atomic and Molecular Physics Division, Harvard-Smithsonian Center for Astrophysics where our speaker will be presented with the Elsevier Benedict Spectroscopy Award. Complete schedule at http://www.cfa.harvard.edu/amp/events.html *** Please let me know if you want to meet with our speaker *** 10:00 am, Monday, May 13th, 2013 Phillips Auditorium Speaker: Prof. Peter. F. Bernath; Chair Department of Chemistry and Biochemistry, Old Dominion University Title: "Molecular Astronomy: Cool starts, brown dwarfs and exoplanets" Abstract: The spectral energy distributions of "cool" astronomical objects such as low mass stars, brown dwarfs and exoplanets are dominated by molecular absorption features. Of particular interest are methane, water, ammonia, and metal hydrides at high temperatures. An overview of this new area of molecular astronomy will be presented from a spectroscopic perspective. The talk will concentrate on spectroscopic measurements related to exoplanets. -- -- Gonzalo Gonzalez Abad Atomic and Molecular Physics Division Harvard-Smithsonian Center for Astrophysics 60 Garden Street, MS 50, Cambridge, MA 02138 Phone: 617-496-7938 Email: ggonzalezabad(a)cfa.harvard.edu -- -- _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

10 years, 11 months

[Aspuru-Guzik group list] No Builds for you...

by Welch, Jonathan

Ok so… yes apparently I wasn't thinking properly today (or most days for that matter…) build orders aren't until next wednesday after we have made the next move. Thanks to Alan and Salvatore for catching me on that =). Kind Regards, Jon

10 years, 11 months

[Aspuru-Guzik group list] Diplomacy Build Orders

by Welch, Jonathan

Hey Everyone, If you have build orders please get them to me today! Kind Regards, Jon

10 years, 11 months

[Aspuru-Guzik group list] Talk by Jiri Vanicek next Monday: “Increasing the Efficiency and Accuracy of Time-resolved Electronic Spectra Calculations"

by Stéphanie Valleau

*what:* CCB/ITAMP Talk by Jiri Vanicek *when:* Monday May 13th from 2-3pm *where:* Phillips Auditorium, 60 Garden St (ITAMP) *abstract:* *“Increasing the Efficiency and Accuracy of Time-resolved Electronic Spectra Calculations" * *Jiri Vanicek* Rigorous quantum-mechanical calculations of coherent ultrafast electronic spectra remain difficult. I will present several approaches developed in our group that increase the efficiency and accuracy of such calculations: First, we justified the feasibility of evaluating time-resolved spectra of large systems by proving that the number of trajectories needed for convergence of the semiclassical Dephasing Representation is independent of dimensionality. This method was accelerated with the Cellular Dephasing Representation in which the number of trajectories is further drastically reduced. The accuracy of potential energy surfaces was increased by combining the Dephasing Representation with accurate on-the-fly ab initio electronic structure calculations, including nonadiabatic and spin-orbit couplings. Finally, the inherent semiclassical approximation was removed in the exact quantum Gaussian Dephasing Representation. Among other examples I will present an ab initio semiclassical dynamics calculation of the time-resolved stimulated emission spectrum of the 54-dimensional azulene and the theoretical justification of the violation of Kasha’s rule of excited-state photochemistry in azulene, using the Multiple Surface Dephasing Representation.

10 years, 11 months

[Aspuru-Guzik group list] Excitonics Seminar: Bradley Olsen, TOMORROW- May 9, 3 PM, RM 36-428

by Catherine M Bourgeois

Please post and forward to your groups - Thanks. -------------------------------------- Center for Excitonics* Seminar Series Thurs, May 9, 2013 3:00 PM RLE Haus Room: 36-428 Self-Assembly of Functional Polymers Bradley Olsen, Department of Chemical Engineering, MIT Abstract: Block copolymer self-assembly represents an elegant, low-cost technique for the fabrication of complex new soft materials. Critical for many of the applications for such materials is incorporating polymers with a given optical, electronic, or biological functionality into the nanostructured material. In contrast to traditional polymers which have Gaussian coil chain shapes, functional systems often have highly anisotropic shapes and specific interactions that can lead to extremely rich self-assembly behavior. In organic electronics, significant effort has been dedicated towards elucidating the thermodynamics of self-assembly in semiconducting polymer systems which tend to take on extended chain conformations due to the conjugated backbones present in the polymers. Over the past decade, a great deal of knowledge has emerged about the effects of chain rigidity on thermodynamic aspects of self-assembly in these systems, driving forward the capability of these block copolymer systems. However, our knowledge of kinetic effects in self-assembly continues to lag, necessitating fundamental studies of dynamics to compliment thermodynamics. Through a combination of scaling theories, molecular dynamics simulation, and experiments we have explored diffusion and molecular relaxation in these systems, hinting at dynamic design rules in organic electronic materials. The use of self-assembled ionic templates provides an alternative method to control structures in optoelectronic materials using block copolymers processed under aqueous conditions. Reversible addition-fragmentation chain transfer (RAFT) polymerization is employed to synthesize diblock copolymers with one neutral thermoresponsive and one polycationic block and the pH-dependent complexation between fluorescent proteins or biomimetic J-aggregating chromophores and the polycationic block is demonstrated. Spin casting is used to prepare nanostructured films from the protein-block copolymer and chromophore-block copolymer coacervates. After film formation, the lower critical solution temperature (LCST) of the thermoresponsive block allows the nanomaterial to be effectively immobilized in aqueous environments at physiological temperatures, enabling use of the materials for biomolecule immobilization and controlled release. The local block copolymer environment is shown to have significant effect on the J-aggregate formation process and morphology. Bio Bradley earned his S.B. from MIT in June 2003. He earned a Ph.D. in Chemical Engineering in December 2007 at UC Berkeley advised by Prof. Rachel Segalman. His research developed the first universal phase diagram for rod-coil block copolymers, an emerging category of polymers with importance for producing self-assembled nanomateirals in biotechnology and organic electronics. He was a NIH and Beckman Institute Postdoctoral Fellow with Profs. David Tirrell, Julia Kornfield, and Zhen-Gang Wang at Caltech, where he applied protein biosynthesis to the design of physically associating telechelic protein hydrogels applied as injectable biomaterials. His current research interests are broadly clustered in the areas of soft condensed matter physics and macromolecular physics, including liquid crystals, biomaterials, colloids, and polymers. He is particularly interested in how biosynthesis can be used as a natural green chemistry for the preparation of designer polymeric materials, how controlled polymerization through biology can give us unique materials that provide insight into polymer physics, and the unique physics of self-assembly in complex protein nanostructures for biotechnology and energy applications. Light refreshments will be served. *The Center for Excitonics is an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science and Office of Basic Energy Sciences

10 years, 11 months

[Aspuru-Guzik group list] [qip] Fwd: [quantum-foundations] Ignacio Cirac - ICFO Quantum Frontiers Summer School 2013

by Edward Farhi

> > From July 25 – 27, the 2013 Ignacio Cirac Summer School will be held at ICFO - the Institute of Photonic Sciences in Spain. > > The school “Frontiers of Quantum Physics and Quantum Information” aims at providing a comprehensive overview of new and exciting research lines at the frontiers of quantum physics by known experts in the field. It covers a broad spectrum of concepts and questions, from abstract problems in quantum information theory to quantum optics experiments using ultra-cold gases. Lectures will be given by Antonio Acín, Immanuel Bloch, Ignacio Cirac, Mikhail Lukin and Frank Verstraete. > > The school is open to talented PhD students and young post-docs. The expected number of attendees is 30, who will be selected by an internal committee. Accommodation and some travel support will be covered by the organization. > > Deadline for registration is June 15th at http://quantumfrontiers.icfo.es/ > Please feel free to circulate the call among those you feel might be interested. > > Best regards, > > On behalf of the local organizing committee: > > Antonio Acin > ICREA Professor > ICFO-The Institute of Photonic Sciences > Mediterranean Technology Park > Av. Carl Friedrich Gauss, 3 > 08860 Castelldefels (Barcelona), Spain > T: +34 93 553 40 62 > F: +34 93 553 40 00 > E: Antonio.Acin(a)icfo.es > I: www.icfo.es :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 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

10 years, 11 months

[Aspuru-Guzik group list] ITAMP topical lunch discussion: Thursday May 9 @ 12:00

by Mikhail Lemeshko

Dear Friends, On Thursday, May 9, 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: Nathalie de Leon Title: Quantum optics in the solid state with diamond nanophotonics Abstract: Large-scale quantum networks will require efficient interfaces between photons and stationary quantum bits. Nitrogen vacancy (NV) centers in diamond are a promising candidate for quantum information processing because they are optically addressable, have spin degrees of freedom with long coherence times, and as solid-state entities, can be integrated into nanophotonic devices. An enabling feature of the NV center is its zero-phonon line (ZPL), which acts as an atom-like cycling transition that can be used for coherent optical manipulation and read-out of the spin. However, the ZPL only accounts for 3-5% of the total emission, and previously demonstrated methods of producing high densities of NV centers yield unstable ZPLs. I will present methods and technologies for gaining both spectral and spatial control over NV emission by coupling NV centers to nanophotonic devices. In particular, we have developed a method to create a high-density device layer of NVs with stable ZPLs in high purity diamond, and have devised a fabrication scheme to carve single mode waveguides out of the surface of the bulk diamond substrate. Using this technique, we are able to fabricate high quality factor, small mode volume photonic crystal cavities directly out of diamond, and deterministically position these photonic crystal cavities so that a stable NV center sits at the maximum electric field. We observe an enhancement of the spontaneous emission at the cavity resonance by a factor of up to 100. The NV emission is guided efficiently into a single optical mode, enabling integration with other photonic elements, as well as networks of cavities, each with their own optically addressable qubit. These nanophotonic elements in diamond will provide key building blocks for quantum information processing such as single photon transistors, enabling distribution of entanglement over quantum networks. 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

10 years, 12 months

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aspuru-list May 2013