aspuru-list February 2018

aspuru-list@lists.fas.harvard.edu

14 participants
32 discussions

[Aspuru-Guzik Group List] [qip] group meeting Friday, IBM visit

by Aram Harrow

Dear quanta, 1. We will meet this Friday at the usual time and place. Anand will speak about verification. 2. If you'd like to come to IBM for our kick-off meeting on Mar 2, please let me know in the next day or two. I'd encourage all MIT students interested in q algorithms or simulation of quantum systems to attend. Because this is on a Friday, we won't have a group meeting on that day. -aram _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

6 years, 2 months

[Aspuru-Guzik Group List] Away

by Felixander Negron

Good afternoon, Just a heads up that I will be away from the office for a few days starting this Friday. If there is anything urgent that you need from me, please be sure to see me before EOD Thursday. Best, Felix *Felixander Negron* *Laboratory Administrator * *Aspuru-Guzik Group* *Harvard University * *Department of Chemistry and Chemical Biology* *12 Oxford St. M 136* *Cambridge, MA 02138* *P:** (617) 496-9964** F: **617-496-9411*

6 years, 2 months

[Aspuru-Guzik Group List] ITAMP lunch seminar - You Zhou, Harvard University (Feb. 22nd)

by Bekenstein, Rivka

*ITAMP Lunch Seminar* *Speaker:* You Zhou (Harvard University) *Date:* Thursday, February 22nd *Time:* 12:00-1:00 pm Includes Pizza. *Title: Exploring the bright and the dark side of excitons in atomically-thin semiconductors* *Abstract: **Atomically thin transition metal dichalcogenides (TMDs) have recently emerged as a new class of semiconductors which exhibit direct band gaps, strong spin-orbit coupling and excitonic effects. In this talk, we will explore the fundamental properties of the bright and dark excitons in TMDs. On the bright side, we will discuss how we improve the optoelectronic properties of TMDs and how these improvements lead to realization of novel optoelectronic devices, such as an atomically-thin electrically-tunable resonant mirror. On the dark side, we introduce a technique to probe the orientation of luminescent excitons in TMDs via near-field coupling to surface plasmon polaritons. This method allows us to directly observe nominally spin-forbidden dark excitons in certain TMDs.* *Location: *B-106 @ Center for Astrophysics (60 Garden Street) *Directions: *After entering the lobby of the CfA, turn right to enter the hallway of the B building. In the hallway, turn right again, B-106 will be at the end of the hallway on the left side.

6 years, 2 months

[Aspuru-Guzik Group List] FW: Special Chez Pierre Seminar_Thursday, February 22, 2018 @ 10:30am in 4-331

by Catherine M Bourgeois

---------- Forwarded message ---------- From: Lesley Keaney <lkeaney(a)mit.edu<mailto:lkeaney@mit.edu>> Date: Thu, Feb 15, 2018 at 12:16 PM Subject: Special Chez Pierre Seminar_Thursday, February 22, 2018 @ 10:30am in 4-331 To: chezpierre <chezpierre(a)mit.edu<mailto:chezpierre@mit.edu>>, cmt_seminar <cmt_seminar(a)mit.edu<mailto:cmt_seminar@mit.edu>> Hello everyone, Please note there will not be a Chez Pierre seminar on Monday, February 19, 2018 due to the Presidents Day Holiday. A Special Chez Pierre Seminar will be held on Thursday, February 22, 2018 at 10:30am in the MIT Duboc room 4-331. Coffee and pastries will be available prior to the talk at 10:15am Marco Polini1, 1 Istituto Italiano di Tecnologia "Topological and quantum plasmonics." When electromagnetic fields are confined through the use of e.g. noble-metal plasmons, losses tend to be high and greatly limit the propagation distance of these collective modes. Substantial efforts have been recently made to increase the lifetime of these modes at room temperature [1,2], without decreasing the associated confining power. A possible pathway is to use plasmons in topologically-non-trivial materials [3-6]. In this talk, I will present a fully quantum-mechanical theory of Weyl semimetal (WSM) Fermi Arc (FA) plasmons [6]. Our theory focuses on the simplest microscopic model Hamiltonian [7] of a type-I WSM with broken time-reversal symmetry and is based on linear response theory [8] and the random phase approximation [8]. I will first highlight how quantum non-local effects are crucial to understand WSM FA plasmon physics and, if time allows, discuss recent progress in understanding quantum non-local effects in graphene plasmonics [9]. Work supported by the European Union's Horizon 2020 research and innovation programme under grant agreement No. 696656 "Graphene Core1". [cid:image001.png@01D3A656.CC7C41D0] References [1] For a recent review see, e.g., D.N. Basov, M.M. Fogler, and F.J. García de Abajo, Science 354, 6309 (2016). [2] A. Woessner et al., Nature Mater. 14, 421 (2015). [3] J.C.W. Song and M.S. Rudner, Proc. Natl. Acad. Sci. (USA) 113, 4658 (2016). [4] D. Jin, L. Lu, Z. Wang, C. Fang, J.D. Joannopoulos, M. Soljačić, L. Fu, and N.X. Fang, Nature Commun. 7, 13486 (2016). [5] J.C.W. Song and M.S. Rudner, Phys. Rev. B 96, 205443 (2017). [6] G.M. Andolina et al., arXiv:1706.06200. [7] R. Okugawa and S. Murakami, Phys. Rev. B 89, 235315 (2014). [8] D. Pines and P. Noziéres, The Theory of Quantum Liquids (W.A. Benjamin, Inc., New York, 1966). [9] M.B. Lundeberg et al., Science 357, 187 (2017). Talk: 10:30am Room: 4-331, Duboc Room Coffee: 10:15am *(As always please remember to dispose of your plates and cups in the large trash containers when you leave the Duboc Room, thank you). Host: Leonid Levitov Chez Pierre seminars are usually scheduled for Mondays at noon in the MIT Duboc Room, 4-331. Seminar speakers, titles and abstracts will be posted on the Chez Pierre website at: http://web.mit.edu/physics/cmt/chezp.html. Thank you, Lesley Lesley Keaney Administrative Assistant Condensed Matter Theory Group MIT Department of Physics Room 6C-339 Cambridge, MA 02139 617.253.4878<tel:(617)%20253-4878> (phone); 617.253.2562<tel:(617)%20253-2562> (fax)

6 years, 2 months

[Aspuru-Guzik Group List] Theochem Visit - Prof. Ryan Steele

by Romero Fontalvo, Jhonathan

Hi everyone, Prof. Ryan Steele from the University of Utah ( http://www2.chem.utah.edu/steele/research.html) will be visiting Harvard next Thursday (February 22nd) for THEOCHEM. The work of his group focuses on studying the coupling between electronic and nuclear motion, which involves developing methods to treat both nuclei and electrons quantum mechanically, with numerous applications to catalysis and biology ( https://chem.utah.edu/directory/steele.php). If you want to meet Prof. Steele and/or have lunch or dinner with him, please let me know. I will send the abstract of his talk soon (His talk is next Wednesday at MIT, 4:15pm, as usual). Cheers, Jhonathan. -- Jonathan Romero Fontalvo *Ph.D. Student in Chemical Physics* *Harvard University* Website: https://sites.google.com/site/jonathanromeroswebsite/

6 years, 2 months

[Aspuru-Guzik Group List] [qip] group meeting tomorrow

by Aram Harrow

Dear quanta, We will meet at the usual time and place tomorrow (6-310, 11am). Xiaodi Wu is visiting from Maryland and will speak. -aram _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

6 years, 2 months

[Aspuru-Guzik Group List] Group meeting, Thu Feb 15, 3:30 PM, Div Room

by Ian Kivlichan

Hi all, Tim will talk at our Valentine's Day group meeting special tomorrow. See below for his title and abstract. All the best, Ian ----------------- Title: Superconducting circuit design augmented with Bayesian optimization Abstract: Superconducting qubits are electrical circuits comprising inductors, capacitors, and Josephson junctions. Although circuit parameters may in principle assume a wide range of values, existing architectures generally span only a small subset of the available design space, and design variations are often based largely on experience and engineering intuition. However, future circuit architectures – such as radically new qubit designs or many-body couplers for adiabatic quantum computing – will likely extend beyond an intuitive regime. Towards this end, we have developed a numerical search engine that screens the parameter design space to achieve circuits with desired spectral properties. The engine performs Bayesian optimization on a graphical model of arbitrary circuits with several nodes. In the first part of the talk, I will give a brief introduction to superconducting circuits. I will then move on to describe our algorithm and present first search results for a many-body coupler. At the end, I would like to pose some challenges of the optimization problem in our approach and ask for feedback from the group.

6 years, 2 months

[Aspuru-Guzik Group List] Happy Valentine's Day!

by Felixander Negron

Treats available in the office by my desk. Swing by and grab some before they are gone! [image: Inline image 1] *Felixander Negron* *Laboratory Administrator * *Aspuru-Guzik Group* *Harvard University * *Department of Chemistry and Chemical Biology* *12 Oxford St. M 136* *Cambridge, MA 02138* *P:** (617) 496-9964** F: **617-496-9411*

6 years, 2 months

[Aspuru-Guzik Group List] Theochem lecture today - Yuji Sugita

by Matthias Degroote

Hi group, Today's Theochem meeting will be about combining machine learning with MD for protein folding. 4:15pm at MIT building 4 room 163. Matthias

6 years, 2 months

[Aspuru-Guzik Group List] ITAMP lunch seminar - Uri Vool, Harvard University (Feb. 15th)

by Bekenstein, Rivka

*ITAMP Lunch Seminar* *Speaker:* Uri Vool (Harvard University) *Date:* Thursday, February 15th *Time:* 12:00-1:00 pm Includes Pizza. *Title: *Artificial atoms in driven superconducting circuits *Abstract:* Superconducting circuits are assembled from a quantum electrodynamic construction set in which the building blocks are linear capacitors and inductors, as well Josephson tunnel junctions which play the role of non-linear inductors. The effective quantum system spanned by the lowest excitations of a superconducting circuit is often called an “artificial atom”. With the increasing variety and complexity of our circuits, and the addition of drives and dissipative elements, it may eventually be possible to “write” an arbitrary Hamiltonian into a circuit. In this talk I will give a very brief review of the construction and measurement of artificial atoms using superconducting circuits. I will then discuss a particular example - a driven-dissipative scheme to engineer an effective Jaynes-Cummings Hamiltonian between a displaced cavity and a superconducting qubit in the transverse (\sigma_x) basis, where both energies and coupling are tunable by drive parameters. Using this scheme, I will present the first quantum-nondemolition measurement of the qubit in the transverse basis. *Location: *B-106 @ Center for Astrophysics (60 Garden Street) *Directions: *After entering the lobby of the CfA, turn right to enter the hallway of the B building. In the hallway, turn right again, B-106 will be at the end of the hallway on the left side.

6 years, 2 months

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aspuru-list February 2018