aspuru-list May 2013

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38 participants
92 discussions

[Aspuru-Guzik group list] [qip] Fwd: TALK:Monday 5-13-13 Note -- Unusual day and time: QUANTUM HAMILTONIAN COMPLEXITY: THROUGH THE COMPUTATIONAL LENS

by Thomas Vidick

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

10 years, 11 months

[Aspuru-Guzik group list] Diplomacy Orders

by Jonathan Welch

Hey Everyone, I have a final from 2-5 today so I will not be in group meeting. Please give your orders to Jacob and he will put them in the secret orders envelope and I will resolve the orders when after 5 and let you know the results. Kind Regards, Jon

10 years, 11 months

[Aspuru-Guzik group list] Brumer

by John Parkhill

We will be in the division room until 11:45, and then give a talk in ITAMP's Phillip's auditorium between 2-3pm. Excitonics people should come! Best- John

10 years, 11 months

[Aspuru-Guzik group list] Friday reading for excitonics guys. 1/3 page only. Enjoy

by Semion Saikin

-- ******************************************** Semion K. Saikin, PhD Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street, Cambridge, MA 02138 email: saykin(a)fas.harvard.edu phone: (619)212-6649 ********************************************

10 years, 11 months

[Aspuru-Guzik group list] [qip] today

by Edward Farhi

Hi Quanta We are meeting today at 11 as usual and we also have a talk at 2:00 by Thomas Vidick. 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

10 years, 11 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] Correction: group meeting at 3:30

by Ryan Babbush

Sorry, the body of the last email was correct, but the subject was wrong. Group meeting is at 3:30pm on Friday. -- Ryan Babbush | PhD Student in Physics (949) 331-3943 | babbush(a)fas.harvard.edu Harvard University | Aspuru-Guzik Group 12 Oxford Street | 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

10 years, 11 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] Group meeting moved to 2:30

by Ryan Babbush

Hi Everyone, Due to Paul Brumer's talk at 2:00 we've decided to move group meeting back half an hour. Accordingly, Sam Blau's group meeting will commence at 3:30 in the Division Room. See you all there! -- Ryan Babbush | PhD Student in Physics (949) 331-3943 | babbush(a)fas.harvard.edu Harvard University | Aspuru-Guzik Group 12 Oxford Street | 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

10 years, 11 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] group meeting tomorrow: Sam Blau

by Ryan Babbush

Hi Everyone, Sam Blau will be presenting his research at group meeting tomorrow. We'll be meeting in the Division Room at 3:00. An abstract is provided below. ===================================== Exciton Dynamics of FMO Using Exact TCL-2 with Compressed Sensed Atomistic Spectral Densities The exciton dynamics of the Fenna-Mathews-Olsen photosynthetic complex (FMO) are modeled using an open quantum systems formalism. We employ an equation of motion with a second-order perturbation in time that explicitly includes nonmarkovian environmental effects. Our bath is assumed to be composed of only harmonic oscillators, and their density of states determines the strength of the system-bath coupling at every frequency. These spectral densities are obtained with atomistic detail from a molecular dynamics simulation. Compressed sensing yields the densities in a basis of Drude-Lorenz peaks and resolves detail more efficiently than a Fourier transform. This facilitates the derivation of an analytical expression for our propagator, allowing for exact evaluation within our framework. The effects of the fine structure of the spectral densities are examined, and our model is benchmarked against the more accurate and expensive hierarchical equations of motion. The two simulations are found to be comparable, while our model can incorporate more peaks in the spectral density and can scale to much larger systems. -- Ryan Babbush | PhD Student in Physics (949) 331-3943 | babbush(a)fas.harvard.edu Harvard University | Aspuru-Guzik Group 12 Oxford Street | 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

10 years, 11 months

[Aspuru-Guzik group list] Fwd: HUCE Graduate Consortium student opportunity

by Alan Aspuru-Guzik

10 years, 11 months

[Aspuru-Guzik group list] Donate unwanted textbooks!

by Joey Goodknight

Hey everyone, If you have any unwanted textbooks that third-world pre-medical or medical students might be able to use, please bring them to my desk by next Friday! One of the PS1 students is part of an organization which gives textbooks to medical and premedical students in the Sudan. *They are looking for physiology, anatomy, general physics, general chemistry, organic chemistry, biology, biochemistry books.* It seems like a cool organization so I help you'll help them if you can. You can read more about them at http://www.sfsss.org/ -Joey

10 years, 11 months

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aspuru-list May 2013