aspuru-list May 2013

aspuru-list@lists.fas.harvard.edu

38 participants
92 discussions

[Aspuru-Guzik group list] End of 1901 - Results

by Jon Welch

Orders Resolved, attached are the results of the build, the current jdip, and the map as it stands for Spring 1902. Next move is on Friday after group meeting. http://www.youtube.com/watch?v=uAjuEGoWCWk I will make a wiki page to post all these results on so we have a record.

10 years, 11 months

[Aspuru-Guzik group list] [qip] Friday

by Edward Farhi

Hi Quanta We will meet tomorrow at 11:00 in 6-310. There will also be a talk at 2:00 by Xiaodi Wu in 6C-442. See you! 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

10 years, 11 months

[Aspuru-Guzik group list] [qip] QIP seminar, Fri 5/17, 2:00 PM, 6C-442, Xiaodi Wu

by Kristan Temme

Dear All, There will be a talk tomorrow in the QIP seminar by Xiaodi Wu (U Michigan) where & when: 6C-442, 2-3pm, Friday, May 17 title: Robust randomness extraction from any weak sources abstract: (Almost) uniform bits are scarce resources in the real world, since physical sources of randomness typically contain biases and correlations. Classically, one can extract almost uniform randomness from an arbitrary weak source with sufficient (min-)entropy using a short *independent* uniform seed as a catalyst. However, it is known that such a goal is impossible to achieve deterministically, or without relying on any independence assumptions. In this talk, we demonstrate that deterministic randomness extraction is possible with the help of *untrusted* quantum devices, *without* relying on any independence assumptions. Specifically, we construct a deterministic procedure such that given an arbitrary weak source with sufficient min-entropy and sufficiently many quantum devices, extracts (almost) uniform bits (when it accepts). The devices may be prepared by an adversary who may hold (quantum) side information of the source, and as long as the source has sufficient min-entropy conditioned on the adversary, the extracted bits are (almost) uniform conditioned on the adversary as well. Additionally, our procedure is computationally efficient and tolerate ~1% of noise in the quantum devices. Based on joint work with Kai-Min Chung and Yaoyun Shi. _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

10 years, 11 months

[Aspuru-Guzik group list] Wiki Page for Diplomacy Results

by Jonathan Welch

Here is the wiki page with the results/orders etc... This will be where I post the new updates from now on. https://aspuru.wikidot.com/diplomacy Kind Regards, Jon -- Jonathan M. Welch Aspuru-Guzik Lab jwelch(a)fas.harvard.edu

10 years, 11 months

[Aspuru-Guzik group list] Last Call for Build Orders

by Jon Welch

France and Austria still need to send me build orders if you have them. (I am well aware that the latter is my own team... however I suffered from TDB disorder... I was too damn busy and forgot to discuss this with them... *cough* )

10 years, 11 months

[Aspuru-Guzik group list] Build Orders

by Welch, Jonathan

Hey Everyone, I haven't received any build orders for this round, so please email them to me if you want any units built since I am about to head out for the day. Please have them to me by 10PM tonight and I will resolve them then and post the new map tomorrow. Kind Regards, Jon

10 years, 11 months

[Aspuru-Guzik group list] Fwd: hey

by Laszlo Seress

map

10 years, 11 months

[Aspuru-Guzik group list] ITAMP topical lunch discussion: Thursday May 16 @ 12:00

by Mikhail Lemeshko

Dear Friends, On Thursday, May 16, 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: K. Rajibul Islam Title: Probing many body physics with cold atom quantum simulator Abstract: Cold atomic systems constitute a near perfect platform for quantum simulation, where a well controlled quantum system is experimentally tuned to behave according to a many body quantum Hamiltonian. In this talk, I will discuss a few examples of quantum simulation experiments with ultracold trapped ions and Bosonic neutral atoms in an optical lattice. The trapped ion system is most suitable for studying long range spin Hamiltonians, and in particular frustrated spin models, that might result in a highly degenerate ground state manifold and entanglement. I will present experimental results from a quantum simulation of a frustrated antiferromagnetic quantum Ising model with trapped Yb-171+ ions, where we tune the range of interactions continuously and directly measure spin correlation functions. I will also describe a quantum gas microscope set up that is used to project a two dimensional optical lattice on a Bose Einstein Condensate of Rb-87 atoms and detect the atoms with single site resolution, for exploring many body physics involving Bose-Hubbard model and quantum phase transitions. 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, 11 months

[Aspuru-Guzik group list] [qip] tomorrow plus

by Edward Farhi

Hi Quanta Tomorrow (Tuesday) we will have a group meeting at 11:00 in 6-310 with Daniel Lidar. He is also speaking at 4:30 to the Physical Chemists. Also today Umesh Vazirani is speaking at 4:15. At 3:45 are refreshments. This sounds interesting. Best, Eddie Note -- Unusual day and time: QUANTUM HAMILTONIAN COMPLEXITY: THROUGH THE COMPUTATIONAL LENS Theory Colloquium 2012/2013 Speaker: Umesh Vazirani Speaker Affiliation: UC Berkeley Date: 5-13-2013 Time: 3:45 PM - 4:15 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. I _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

10 years, 11 months

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

by Stéphanie Valleau

Hi everyone, This is a reminder for Prof. Vanicek's talk tomorrow from 2-3pm, details copied below, Best, Stephanie ---------- Forwarded message ---------- From: Stéphanie Valleau <stephanievalleau(a)gmail.com> Date: Wed, May 8, 2013 at 10:48 AM Subject: Talk by Jiri Vanicek next Monday: “Increasing the Efficiency and Accuracy of Time-resolved Electronic Spectra Calculations" To: A-G Group <aspuru-list(a)lists.fas.harvard.edu> *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

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aspuru-list May 2013