aspuru-list September 2014

aspuru-list@lists.fas.harvard.edu

28 participants
73 discussions

[Aspuru-Guzik group list] TODAY at 4:00 PM! Arno Rauschenbeutel - HQOC/ITAMP Joint Quantum Sciences Seminar

by Coleman, Karl

HQOC/ITAMP Joint Quantum Sciences Seminar Wednesday, September 10, 2014 4:00 PM, Jefferson 250 Prof. Arno Rauschenbeutel, Vienna Center for Quantum Science and Technology Breaking the Mirror Symmetry of Spontaneous Emission via Spin-Orbit Interaction of Light Light is often described as a fully transverse--polarized wave, i.e., with an electric field vector that is orthogonal to the direction of propagation. However, this is only valid in the framework of the paraxial approximation. Yet, in many physically relevant situations, like in strongly focused laser beams, plasmonic structures, nanophotonic waveguides or optical microresonators, light is transversally confined in the strongly non--paraxial regime and exhibits strong intensity gradients at the wavelength scale. According to Maxwell’s equations, this leads to a significant polarization component that points in the direction of propagation of the light. In contrast to paraxial light fields, the corresponding photon spin is position--dependent – an effect referred to as spin--orbit interaction of light. Remarkably, the photon spin can even be perpendicular to the propagation direction. I will discuss experimental situations in which this extreme condition occurs and will show that the interaction of quantum emitters with such light fields leads to new and surprising effects. In particular, the intrinsic mirror symmetry of the spontaneous emission of light by atoms into silica nanophotonic waveguides or into whispering--gallery--mode microresonators is broken. This allowed us to realize a directional nanophotonic atom--waveguide interface and enabled the control and non--linear manipulation of single fiber--guided photons with a single resonator--enhanced atom. The additional control over light--matter interaction provided by spin-- orbit interaction of light is thus highly interesting both from a fundamental point of view and for the implementation of next--generation communication and information processing devices. Brendan Shields, Lukin Lab Efficient Readout of a Single Spin State via Spin to Charge Conversion in Diamond Postdoc Presentation begins at 4:00 PM Refreshments are served from 4:10-4:30 PM Guest Presentation begins at 4:30 PM Karl Coleman HQOC Laboratory Administrator Faculty Assistant to Profs. Greiner and Lukin Harvard University Department of Physics 17 Oxford Street Cambridge, MA 02138 P: (617) 496-2544 F: (617) 496-2545

9 years, 7 months

[Aspuru-Guzik group list] [theochem-announce] Troy Van Voorhis theoretical chemistry seminar TODAY 9/10 4-6 PM in

by Michael Mavros

Just a reminder that the theoretical chemistry seminar by Troy Van Voorhis will be TODAY from 4-6 PM in 56-114. As a reminder, refreshments will be available on a first-come first-serve basis approx. 15 minutes prior to the start of the seminar, and there will be a short break after the first half of the talk. *Electronic Dynamics in Complex Environments: From Electron Transfer to Singlet Fission* Some of the most basic chemical reactions are those that involve primarily the motion of electrons with little rearrangement of the nuclei. Prominent examples include electron transport and excitonic energy transfer as well as more exotic phenomena such as singlet fission. These reactions are the centerpiece of artificial photosynthetic complexes, organic PVs and essentially all of redox chemistry. In treating the dynamics of these reactions, it becomes clear that knowledge of the molecular conformation alone is not sufficient to define a reaction coordinate (since the nuclei may not more appreciably during the course of the reaction). In this talk, we will discuss how the “reactant” and “product” states for these types reactions can be clearly defined using the electron density as the fundamental variable. We will illustrate the utility of this approach using two examples: electron transfer in solution the simulation of singlet fission in organic photovoltaics. -- Michael Mavros Department of Chemistry, Massachusetts Institute of Technology _______________________________________________ theochem-announce mailing list theochem-announce(a)mit.edu http://mailman.mit.edu/mailman/listinfo/theochem-announce

9 years, 7 months

[Aspuru-Guzik group list] Friday visitor: Sam Smith

by Joey Goodknight

Hello All, We have a visitor to our lab this Friday: Sam Smith from the group of Alex Shin who investigates "theories of charge and energy transport within organic semiconductors" and who is a close collaborator with Cynthia Friend. More information on him can be found at his website: http://w3.tcm.phy.cam.ac.uk/~sls56/ *Let me know if you would like to meet with him!* There are plenty of spots open. -Joey

9 years, 7 months

[Aspuru-Guzik group list] Fwd: Postdoc position in Christoph Simon's group, University of Calgary

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: Christoph Simon <christoph.simon(a)gmail.com> Date: Tue, Sep 9, 2014 at 12:05 PM Subject: Postdoc position in Christoph Simon's group, University of Calgary To: Dear colleagues, please distribute this ad to whoever you think might be interested. I am looking to fill a postdoc position in my theoretical quantum optics group at the University of Calgary, see also http://www.iqst.ca/people/peoplepage.php?id=225. The main current strengths of our group are quantum communication (quantum repeaters, quantum memories, photon-photon gates) and macroscopic quantum effects (micro-macro entanglement of light, atomic cat states, quantum optomechanics). However, candidates with backgrounds in room-temperature quantum coherence and quantum information processing, quantum biology, and quantum foundations are also encouraged to apply. Candidates should contact me by email (christoph.simon(a)gmail.com) with a CV and list of publications and should arrange for at least two reference letters to be sent to me as well (email is fine). I am looking for candidates who would be able to start early next year at the latest. Many thanks, Christoph Simon

9 years, 7 months

[Aspuru-Guzik group list] Save the Date - Farewell to our friends!! Sept. 17th @ 5PM

by Marlon Cummings

Date & Time : 9/17/2014 at 5PM Location: Social space outside M111 Celebrating Felipe, Carolina, and Xavier. Cake and soft drinks. ---------------- Marlon G. Cummings Lab Manager, Aspuru-Guzik Group Mallinckrodt M112 Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge, MA 02138 617-496-9964 617-496-9411 (fax) http://aspuru.chem.harvard.edu/

9 years, 7 months

[Aspuru-Guzik group list] (no subject)

by Gelbwaser, David

Hello All My name is David Gelbwaser and I am a new postdoc at the group. I already met some of you during my last visit in February, but I will be happy to meet everyone and share ideas (or some tequila shots) during this stay. I’ve done my undergrad studies in Mexico, where I’m originally from, and have worked during my M.Sc. and Ph.D. on Quantum Thermodynamics and Open Quantum Systems at the Weizmann Institute in Israel. I would like to continue on the subject and model solar energy conversion (in solar cells and photosynthesis) as a quantum heat engine, so all new ideas and insights are welcome. You can find me in MCB 1096 (new Siberia) or contact me by e-mail dgelbwaser(a)fas.harvard.edu. Cheers David

9 years, 7 months

[Aspuru-Guzik group list] FW: [iQuISE] Prof. Seth Lloyd :: Thu. 12pm :: 26-214

by Guerreschi, Gian

iQuISE seminars every Thursday at noon at MIT. Good science and free pizza. :-) G ________________________________ From: Alexandre Cooper-Roy [alcoop(a)mit.edu] Sent: Tuesday, September 09, 2014 9:47 AM To: iquise-associates(a)mit.edu Subject: [iQuISE] Prof. Seth Lloyd :: Thu. 12pm :: 26-214 Hi all, we are very happy to invite you to the first iQuISE seminar of the academic year on Thu. 09/11 at 12pm in 26-214. Prof. Seth Lloyd from MIT will tell us about "Quantum Machine Learning". Please make sure to share this invitation email with your new colleagues! We will compile a list of new members on Thursday to include them in our mailing list. You may already want to add to your calendar our weekly seminar series, which will go on every Thursday at 12pm in 26-214. Pizza will be served; please bring along your plate and utensils! We have already secured a great list of prominent speakers, including Prof. Christopher King from NEU (09/18), Prof. Adreas Wallraff from ETH (09/25), Prof. Michal Lipson from Cornell (11/06), Prof. John Preskill from Caltech (11/13). We are still looking for more speakers. Please let us know if you would be interested in presenting about your research or know about a visitor that may be interested in doing so. See you all on Thursday noon! iQuISE leadership team ---------------------------------------------------- Prof. Seth Lloyd, MIT "Quantum Machine Learning" ROOM 26-214 THURSDAY, SEPTEMBER 11, 2014 12:00 PM - 1:00 PM Machine learning algorithms look for patterns in large arrays of high-dimensional vectors. Quantum computers are adept at manipulating large arrays of high-dimensional vectors. This talk presents a series of quantum algorithms for big data analysis. The ability of quantum computers to perform Fourier transforms, find eigenvectors and eigenvalues, and invert matrices translates into quantum algorithms that are exponentially faster than their classical counterparts: complex patterns in datasets of size N can be identified in time O(log N). ---------------------------------------------------- Alexandre Cooper, Graduate Student Quantum Engineering Laboratory, MIT Tel: 1-617-945-4708 (Mobile)

9 years, 7 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] Group Meeting Thursday, Sept 11th

by Jennifer Wei

Hi Everyone, This week, Sarah will be giving group meeting on Thursday, Sept. 11th, at 2:30pm in the Division room. The abstract and title can be found below. See you there! Jennifer Towards Outperforming Classical Algorithms with Analog Quantum Simulators With quantum computers being out of reach for now, quantum simulators are the alternative devices for efficient and more exact simulation of problems that are challenging on conventional computers. Quantum simulators are classified into analog and digital, with the possibility of constructing “hybrid” simulators by combining both techniques. In this talk, I will focus on analog quantum simulators of open quantum systems and address the limit that they can beat classical computers. I will talk about a physical setup that can be used to reproduce the quantum dynamics of a standard and multiple-mode Holstein model. This scheme is based on currently available technology of superconducting circuits consist of flux qubits and quantum oscillators. In particular, as an example, I will discuss the simulation of chlorosome light-harvesting antennae from green sulfur bacteria with over 250 phonon modes coupled to each electronic state. _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

9 years, 7 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] Prof. Van Voorhis visit today and Theochem presentation tomorrow

by Jennifer Wei

Hi everyone, This is a reminder that Prof. Van Voorhis will be visiting us today. Please join us if you can for a group discussion with him at 4:30pm in the theory area. There is still one spot open for dinner if anyone is interested. Prof. Van Voorhis will also be giving the first Theoretical Chemistry Seminar Series this Wednesday. The seminar will be from 4-6pm in 56-114 (a different room than the one used last year). The abstract and title of the talk are posted below. Thanks, Jennifer *Electronic Dynamics in Complex Environments: From Electron Transfer to Singlet Fission* Some of the most basic chemical reactions are those that involve primarily the motion of electrons with little rearrangement of the nuclei. Prominent examples include electron transport and excitonic energy transfer as well as more exotic phenomena such as singlet fission. These reactions are the centerpiece of artificial photosynthetic complexes, organic PVs and essentially all of redox chemistry. In treating the dynamics of these reactions, it becomes clear that knowledge of the molecular conformation alone is not sufficient to define a reaction coordinate (since the nuclei may not more appreciably during the course of the reaction). In this talk, we will discuss how the “reactant” and “product” states for these types reactions can be clearly defined using the electron density as the fundamental variable. We will illustrate the utility of this approach using two examples: electron transfer in solution the simulation of singlet fission in organic photovoltaics. _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

9 years, 7 months

[Aspuru-Guzik group list] Fwd:

by Joey Goodknight

looks like we found the chair! ---------- Forwarded message ---------- From: Peoples Chair <peopleschairliberationfront(a)gmail.com> Date: Mon, Sep 8, 2014 at 2:34 PM Subject: Re: To: Ryan Babbush <babbush(a)fas.harvard.edu>, joey.goodknight(a)gmail.com, thomasmarkovich(a)gmail.com it's in Kathy Oakley's office. she is innocent spare her your ire. Also I'm not Joey On Mon, Sep 8, 2014 at 2:31 PM, Ryan Babbush <babbush(a)fas.harvard.edu> wrote: > Agreed. On the condition that the chair is returned, unharmed, by the time > I get to the office tomorrow morning. > > 2014-09-08 14:27 GMT-04:00 Peoples Chair < > peopleschairliberationfront(a)gmail.com>: > >> [image: Inline image 1] >> > > > > -- > 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 >

9 years, 7 months

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aspuru-list September 2014