aspuru-list January 2019

aspuru-list@lists.fas.harvard.edu

14 participants
41 discussions

[Aspuru-Guzik Group List] Post-doc lunch with Peter Lodahl - Wednesday Nov 28

by Tijs Karman

Dear postdocs, Peter Lodahl is visiting later this week and will be speaking at the joint quantum seminar. This Wednesday (28th) we'll take him to lunch at 12 noon most likely at Russel House (unconfirmed). If you'd like to join, please sign up though the following spreadsheet: https://docs.google.com/spreadsheets/d/163JPLGgsfs3ukrB9p_LzJr7hOc-v6u6n7A9… Best, Tijs Karman

5 years, 2 months

[Aspuru-Guzik Group List] Group Meeting Jan 31

by Riley Hickman

Hello all, Tomorrow, Alejandro Perdomo-Ortiz will speak at the group meeting. See below for title, abstract, and short biography. The Toronto side will meet in SS571 at 2:30pm. Those in Boston or elsewhere, please send me your Skype information prior to the meeting. See you all there, Riley ------------------------------------------------- Title: Quantum-assisted Machine Learning in Near-Term Quantum Devices. Abstract: With quantum computing technologies nearing the era of commercialization and quantum advantage, machine learning (ML) has been proposed as one of the promising killer applications. Despite significant effort, there has been a disconnect between most quantum ML proposals, the needs of ML practitioners, and the capabilities of near-term quantum devices towards a conclusive demonstration of a meaningful quantum advantage in the near future. In this talk, we provide concrete examples of intractable ML tasks that could be enhanced with near-term devices. We argue that to reach this target, the focus should be on areas where ML researchers are struggling, such as generative models in unsupervised and semi-supervised learning, instead of the popular and more tractable supervised learning tasks. We focus on hybrid quantum-classical approaches and illustrate some of the key challenges we foresee for near-term implementations. Short Bio: Alejandro did his graduate studies, M.A and Ph.D. in Chemical Physics, at Harvard University. Over the past 10+ years, he has worked on the implementation of quantum computing algorithms, enhancing their performance with physics-based approaches while maintaining a practical, application-relevant perspective. Before joining Rigetti as a Senior Research Scientist, Alejandro was the lead scientist of the Quantum Machine Learning effort at NASA's Quantum Artificial Intelligence Laboratory (NASA QuAIL). He also holds an Honorary Senior Research Associate position at University College London. His latest research involves the design of hybrid quantum-classical algorithms to solve hard optimization problems and intractable machine learning subroutines.

5 years, 2 months

[Aspuru-Guzik Group List] Reminder TODAY: Joint Quantum Seminar - Wednesday, January 30 @ 4:00 - Prof. Jelena Vuckovic (Stanford)

by Dakoulas, Samantha R

Joint Quantum Seminar Wednesday, January 30, 2019 4:00 PM, Jefferson 250 Prof. Jelena Vuckovic, Stanford University “Optimized Quantum Photonics” At the core of most quantum technologies, including quantum networks and quantum simulators, is the development of homogeneous, long lived qubits with excellent optical interfaces, and the development of high efficiency and robust optical interconnects for such qubits. To achieve this goal, we have been studying color centers in diamond (SiV, SnV) and silicon carbide (VSi in 4H SiC), in combination with novel fabrication techniques, and relying on the powerful and fast photonics inverse design approach that we have developed. Our inverse design approach offers a powerful tool to implement classical and quantum photonic circuits with superior properties, including robustness to errors in fabrication and temperature, compact footprints, novel functionalities, and high efficiencies. We illustrate this with a number of demonstrated devices in silicon, diamond, and silicon carbide, including wavelength and polarization splitters and converters, power splitters, couplers, nonlinear optical isolators, on chip laser driven particle accelerators, and efficient quantum emitter-photon interfaces for color centers in diamond and in SiC. We are also employing this approach to implement a quantum simulator based on color centers in semiconductors. Student Presentation by Bart Machielse (Electromechanical control of quantum emitters in nanophotonic devices) will begin at 4:00. Guest Presentation will begin at 4:30 PM. Refreshments will be provided. Samantha Dakoulas Faculty Assistant to Professors Lukin & Greiner & their groups Department of Physics 17 Oxford St., Lyman 324A Cambridge, MA 02138 P. (617) 496-2544

5 years, 2 months

[Aspuru-Guzik Group List] TODAY - 10AM - Special Seminar: Nathan Schine

by Ploucha, Clare

Harvard Quantum Initiative Special Seminar Wednesday, January 30 10:00 AM Jefferson 356 Nathan Schine (University of Chicago) Quantum Hall physics with photons Topological materials have recently become a distinct focus in condensed matter physics, appearing famously in the quantum Hall effect and topological insulators. In these materials, certain essential properties are governed by ‘topological invariants,’ quantities insensitive to local perturbation or manipulation. As such, understanding and measuring topological invariants play a central role in investigations of topological materials. Synthetic materials in which the constituent particles are photons trapped in an optical resonator offer an exciting platform on which to study topological materials. Recent efforts have realized broad control over the single-photon Hamiltonian, including a strong synthetic magnetic field for photons, and strong photon-photon interactions. In this talk, I will present how a nonplanar resonator can harbor a quantum Hall system on the surface of a cone. I will then discuss measurements of three distinct topological indices, offering insight onto their physical meaning and application. We measure the Chern number via local real-space projectors and access two additional topological invariants, the mean orbital spin and chiral central charge, via the variation of the local density of states near a singularity of spatial curvature. I will then transition to the creation of strong interactions between individual photons by hybridizing cavity photons with Rydberg excitations of a cold atomic gas. Combining these technologies enables our ongoing work towards the creation of a fractional quantum Hall system of photons and the corresponding exploration of correlated states and topological phases of matter. Clare Ploucha Administrative Program Manager Max Planck/Harvard Research Center for Quantum Optics Department of Physics 17 Oxford Street, Jefferson 357 Cambridge, MA 02138 P: 617-495-3388

5 years, 2 months

[Aspuru-Guzik Group List] [qip] UROP for undergrads

by Ramis Movassagh

Hi all, There are 2 undergraduate UROP opportunities for Spring if you are interested (see under my name). http://uaap.mit.edu/research-exploration/urop/apply/urop -advertised-opportunities You can get credits or $ depending on you preference. Gotta be an undergraduate though. Supervisors are me and Peter Shor. The two topics are listed there: (1) Short depth circuits and quantum AI (2) Mathematics of AI, why does AI work so well? Let me know if you are interested ASAP. Ideally I like to have a discussion on Monday. Feel free to forward. Best, -- Ramis _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

5 years, 2 months

[Aspuru-Guzik Group List] urgent - title of your project/a sentence describing your project in the group

by Mukesh Dodain

Hello All, Thank you for sending me the HQP consent form at such a short notice. Could you please send me the title of your project/ thesis/ a sentence describing your project work with research group by return email. This is a bit urgent, so I would appreciate a prompt reply. My apologies for the short notice again. Best regards, Mukesh

5 years, 2 months

[Aspuru-Guzik Group List] ITAMP lunch seminar - Wen Wei Ho, Harvard (January 31th)

by Zolfaghari Jooya, Hossein

*Speaker: *Wen Wei Ho (Harvard) *Date:* Thursday, January 31th *Time:* 12:00-1:00 pm Includes Pizza. *Title: *Quantum many-body scarring: a weak ergodicity-breaking phenomenon *Abstract: *A central postulate of statistical mechanics is that of ergodicity -- a generic state prepared out of equilibrium is believed to explore its allowed phase phase and eventually thermalize. In interacting quantum systems, known exceptions to this behavior include strongly disordered, many-body localized (MBL) systems, and finely-tuned, integrable systems. Recently, quench experiments with Rydberg atom arrays [Nature 551, 579 (2017)] demonstrated non-thermalizing dynamics of a new kind: surprisingly long-lived, periodic revivals from certain simple initial states, while quick relaxation and equilibriation from others as expected in a quantum chaotic system. In this talk, I will show that these observations are attributed to the presence of a small number of exceptional, nonthermal many-body eigenstates dubbed "quantum many-body scars" that violate the eigenstate thermalization hypothesis (ETH) [1]. I will furthermore demonstrate that underlying the long-lived many-body revivals is an unstable, periodic orbit, captured in a suitable variational "semiclassical" description of the dynamics using matrix-product-states, which suggests a possible connection to the similarly named phenomenon of quantum scarring in single-particle quantum chaos [2]. Lastly, I will discuss recent work on how a weak, quasilocal deformation can stabilize revivals, leading to virtually perfect oscillations with emergent SU(2) dynamics, and which suggests an underlying Hamiltonian with exact quantum many-body scarring [3]. Quantum many-body scarring represents a new class of quantum dynamics in strongly interacting systems resulting from a weak form of ergodicity breaking, with direct experimental signatures. Refs: [1] Nat. Phys. *14*, 745–749 (2018) [2] arXiv:1807.01815, https://arxiv.org/abs/1807.01815 [3] arXiv:1812.05561, https://arxiv.org/abs/1812.05561 *Location: *B-106 @ Center for Astrophysics (60 Garden Street <https://maps.google.com/?q=60+Garden+Street&entry=gmail&source=g>) *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.

5 years, 2 months

[Aspuru-Guzik Group List] JANUARY 30 - 10AM - Special Seminar: Nathan Schine

by Ploucha, Clare

5 years, 2 months

[Aspuru-Guzik Group List] Joint Quantum Seminar - Wednesday, January 30 @ 4:00 - Prof. Jelena Vuckovic (Stanford)

by Dakoulas, Samantha R

5 years, 2 months

Re: [Aspuru-Guzik Group List] NSERC - HQP consent form

by Alan Aspuru-Guzik

EVERBODY in the group should send this form. Please do it today, Alan Alán Aspuru-Guzik Professor of Chemistry and Computer Science | Vector Institute Canada 150 Research Chair in Quantum Chemistry | CIFAR Senior Fellow University of Toronto | 80 St George St | Toronto, ON M5S 3H6, Canada http://matter.toronto.edu <https://mailtrack.io/trace/link/52ba0e6dd5e3133fd8f46592f415b7c7153bc7f6?ur…> Twitter @A_Aspuru_Guzik aspuru(a)utoronto.ca On Mon, Jan 28, 2019 at 9:29 AM Mukesh Dodain <mukesh.dodain(a)utoronto.ca> wrote: > SaneAttachments has copied these files to *Dropbox* > [image: SaneBox] > <https://mailtrack.io/trace/link/174f54a35d9c69ebbf7e0882eb8e2faf3296428f?ur…> > > F100D_e.pdf > <https://mailtrack.io/trace/link/8210090fb65c97db3165341ea2c5992166369f5f?ur…> > Dropbox/SaneBox/Mukesh Dodain/_Aspuru-Guzik Group List_ NSERC - HQP con_, > 2019-01-26 06.34.32 PM/ > > Hello, > > As you may know, I am assisting Alan with his NSERC application, where we > are required to provide details of highly qualified professional (HQP) of > his group. Could you please provide your consent by signing the attached > form and send it to me at your earliest. > > Best regards, > > Mukesh > > > > > > *Mukesh Dodain* > > Research Group Coordinator > > Alán Aspuru-Guzik Research Group > > University of Toronto > > 80 St. George Street | Toronto, ON | M5S 3H6 > > mukesh.dodain(a)utoronto.ca; aspuru.admin(a)utoronto.ca > > > > > _____________________________________________ > Aspuru-List mailing list > Aspuru-List(a)lists.fas.harvard.edu > https://lists.fas.harvard.edu/mailman/listinfo/aspuru-list > <https://mailtrack.io/trace/link/9a7ddeb087cc7801b511358e640fb744536c73c4?ur…> >

5 years, 2 months

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aspuru-list January 2019