aspuru-list April 2013

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54 participants
81 discussions

[Aspuru-Guzik group list] [qip] this week and ...

by Edward Farhi

Hi Quanta We are going to meet this week at 2:00 because of a scheduling conflict. We will meet in 6-310 as usual. Best, Eddie Please note that on Wednesday April 24 at 4:00 in 26-214 there will be a talk by Pierre Rouchon on quantum control. Title: Measurement-based feedback versus coherent feedback (reservoir engineering) for the LKB photon-box For quantum systems exist two kinds of stabilizing feedback: measurement-based feedback and coherent feedback relying on reservoir engineering. In this talk, we present these two kinds of feedback for the photon-box developed by Serge Haroche and his collaborators [0]. For the measurement-based feedback, we describe the first experimental implementation of a full-state feedback that stabilizes photon-number states [1,2]. The dynamics are governed by a non-linear controlled Markov chain with the density matrix as the hidden state. The control scheme admits an observer/controller structure. The observer provides a real-time estimation of the density matrix. It relies on a discrete-time implementation of quantum filtering techniques and takes into account known measurement imperfections. The controller is a stabilizing state-feedback law based on a Lyapunov function. This function is derived from open-loop martingales attached to the quantum non-demolition process that measures photons without destroying them. For the coherent feedback scheme we present a recent proposal [3,4] based on reservoir eng! ineering to stabilize phase-cat states: it relies on a composite interaction (dispersive/resonant/dispersive) between the photons and the probe atoms. The resulting Kraus map describing the ensemble average of the photon dynamics admits a unique globally stable steady-state. This steady-state is close to a phase-cat state. It is also robust to parametric errors and decoherence. ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: 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

11 years, 1 month

[Aspuru-Guzik group list] TENURE

by Alan Aspuru-Guzik

Dear current and former group members, I just wanted to share with you the news I just got a minute ago: I am now tenured in the department. THANK YOU FOR ALL YOUR SUPPORT AND WORK ALONG THE PROCESS! Jumping up and down! Alan Alán Aspuru-Guzik | Associate Professor Harvard University | Department of Chemistry and Chemical Biology 12 Oxford Street, Room M113 | Cambridge, MA 02138 (617)-384-8188 | http://aspuru.chem.harvard.edu | http://about.me/aspuru

11 years, 1 month

[Aspuru-Guzik group list] Thank you!

by Alan Aspuru-Guzik

Needless to say, Thanks for all your nice messages! I really appreciate your energy and owe it all to you and your good spirit. Good night, Alan Alán Aspuru-Guzik | Associate Professor Harvard University | Department of Chemistry and Chemical Biology 12 Oxford Street, Room M113 | Cambridge, MA 02138 (617)-384-8188 | http://aspuru.chem.harvard.edu | http://about.me/aspuru

11 years, 1 month

[Aspuru-Guzik group list] April 3, 2013 - Prof. Romain Quidant, HQOC/ITAMP Joint Quantum Sciences Seminar

by Hamilton, Joan

***HQOC/ITAMP Joint Quantum Sciences Seminar*** **April 3, 2013 at 4:00 PM - Jefferson 250** *Prof. Romain Quidant, ICREA Professor, ICFO* "Shining a (Bright) Light on the Very Small" Extensive research in Nano-optics over the last decade has made possible controlling optical fields on the nanometer scale. Such concentration of light, well below the limit of diffraction opens plenty of new routes towards enhanced interaction with tiny amounts of matter down to the single molecule/atom level. In this talk we will present our recent advances in enhanced light-matter interaction on the nanometer scale and their applications to quantum optics. We first discuss the controlled electromagnetic coupling of single to few quantum emitters with plasmonic nano-antennas. For this purpose, we developed a fabrication technique that enables accurate positioning of said quantum dot(s) at a predefined location of the antenna. Our experiments first shows that the antenna can be designed to efficiently control the emission properties of the quantum emitters. Using the same technique, we also demonstrate that a single qdot can be used to probe the optical near field of the antenna. In the second part of the talk we discuss a different approach in which light is used to trap and manipulate a single nanodiamond containing a single nitrogen vacancy. We demonstrate both translational and angular control of the trapped NV and discuss applications to vectorial magnetometry and mapping of the electromagnetic local density of states. The final part of the talk presents our recent advances in optomechanics. We optically trap a single nanoparticle in high vacuum and cool its three spatial degrees of freedom by means of active parametric feedback. Using a single laser beam for both trapping and cooling we demonstrate a temperature compression ratio of four orders of magnitude. The absence of a clamping mechanism provides robust decoupling from the heat bath and eliminates the requirement of cryogenic precooling. The small size and mass of the nanoparticle yield both high resonance frequencies and quality factors along with low recoil heating, which are essential conditions for ground state cooling and for low decoherence. Joan Hamilton Faculty Assistant to Profs. Greiner and Lukin HQOC Laboratory Administrator HUCTW Local Union Representative Harvard University Department of Physics 17 Oxford Street Cambridge, MA 02138 P: (617) 496-2544 F: (617) 496-2545

11 years, 1 month

[Aspuru-Guzik group list] Fwd: space on nssha

by Alan Aspuru-Guzik

Please reply ASAP if this data is important! Send e-mail also CC to Brian Mantenuto! Alan Alán Aspuru-Guzik | Associate Professor Harvard University | Department of Chemistry and Chemical Biology 12 Oxford Street, Room M113 | Cambridge, MA 02138 (617)-384-8188 | http://aspuru.chem.harvard.edu | http://about.me/aspuru ---------- Forwarded message ---------- From: Mantenuto, Brian <brian_mantenuto(a)harvard.edu> Date: Tue, Apr 2, 2013 at 10:04 AM Subject: space on nssha To: "aspuru(a)chemistry.harvard.edu forwards to aspuru.com" <alan(a)aspuru.com> Hi Alan,**** we are in the process of clearing on the scratch space on nssha. We are moving this server to Holyoke as part of our build out there. We have noticed your lab has managed to squirrel away some data here. Even though this is scratch we want to make sure folks have a chance to move anything “important” to their normal storage arrays. Is there anything here you need or can we just delete it?**** 8.7T scratch08/aspuru_lab**** 71G scratch08/Aspuru-Guzik_Lab**** ** ** Thanks,**** Brian**** ** **

11 years, 1 month

[Aspuru-Guzik group list] ITAMP topical lunch discussion: Thursday April 4 @ 12:00

by Mikhail Lemeshko

* Dear Friends, On Thursday, April 4, 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: Jack DiSciacca Title: Single Particle Measurment of the Proton and Antipoton Magnetic Moments Abstract: We report the first measurements of the proton and antiproton magnetic moments using a single particle. The antiproton result represents a factor of 680 improvement in precision over previous work using exotic atom spectroscopy, which has achieved a 3000 ppm precision and remained essentially unchanged in the past 20 years. Our measurement allows for an improved comparison of the proton and antiproton magnetic moments, yielding a result consistent with the prediction of charge, parity and time reversal symmetry. Following a proof of principle, 2.5 ppm measurement of the proton magnetic moment, the experiment was moved to CERN for the antiproton experiment. Initial work focused on catching, cooling and trapping a single antiproton from the 5 MeV beam at CERN's Antiproton Decelerator. Following this work, we undertook a magnetic moment measurement. Prospects for further improvement should be possible with single spin flip detection, similar to what was used to measure the electron magnetic moment. 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

11 years, 1 month

[Aspuru-Guzik group list] [IACS-events] Next IACS Seminar April 12: Miriah Meyer

by Reid, Rosalind

There will be no IACS Seminar this week, as David H. Rogers of Sandia National Laboratories has had to postpone his visit to the 2013-14 academic year. Next week, on Friday, April 12, we will welcome Miriah Meyer of the University of Utah (formerly a postdoctoral research fellow at Harvard SEAS and a visiting scientist at the Broad Institute), speaking on "Designing Visualizations for Biological Research." We will send details of that talk within the next week. And mark your calendar for our final seminar for the current academic year, to be given April 26 by Franziska Michor of the Harvard School of Public Health. ********** For more information about events at IACS, and to subscribe to our google calendar, visit http://iacs.seas.harvard.edu/events _______________________________________________ Iacs-events mailing list Iacs-events(a)seas.harvard.edu https://lists.seas.harvard.edu/mailman/listinfo/iacs-events

11 years, 1 month

[Aspuru-Guzik group list] Указом от принтера царя: An Edict from the Printer Tsar

by Joey Goodknight

Товарищи!, For the greater glory of the printer and the glorious people's research group of Aspuru-Guzik, it has been deemed in the best interest of all the people that we *recycle the rack of paper beside the big office printer every month, on the first of the month*. As a reminder, that rack of paper is for abandoned papers in the printer but it tends to pile up so to keep it from piling up too much in the future, I'll be throwing it out at the beginning of each month--starting today at the end of the day. Reprinted below in the proper people's language: Для большей наследования принтеров и благородных людей исследовательской группы Aspuru-Гузик, он был признан в интересах всех людей, которых мы перерабатываем стойки бумаги, рядом с Большой офисный принтер каждый месяц, на первом из в месяц. Напомним, что стойка бумаги отказались от нее для бумаги в принтер дома направлена на крышку идет вверх так, чтобы он не накапливается слишком много в будущем, я буду бросать его в начале каждого месяца - начиная Сегодня в конце дня. -Joey http://www.youtube.com/watch?v=9NKHJ64qRR8

11 years, 1 month

[Aspuru-Guzik group list] Wiki update

by Sawaya, Nicolas

Hey everyone, Here is an update on new additions to the wiki. Content is starting to build up, which is great. New changes from group members: * Spare Computer Parts page * Printer IP addresses and installation info * CUDA installation information * Mopac page * Open Bable & Avogadro page * Changes made to Grant Details Cheers, Nicolas

11 years, 1 month

[Aspuru-Guzik group list] Borja Peropadre

by Alan Aspuru-Guzik

Dear group members, Please send me any feedback that you might have on your conversation with Borja Peropadre. I am considering him for a postdoc position. Best, Alan Alán Aspuru-Guzik | Associate Professor Harvard University | Department of Chemistry and Chemical Biology 12 Oxford Street, Room M113 | Cambridge, MA 02138 (617)-384-8188 | http://aspuru.chem.harvard.edu | http://about.me/aspuru

11 years, 1 month

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aspuru-list April 2013