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7234 discussions

[Aspuru-Guzik Group List] [qip] group meeting tomorrow and job ads

by Aram Harrow

Dear quanta, Let's meet tomorrow at 11am. We don't have a speaker lined up but will go around the room and give updates and possibly eat donuts. While I'm writing, here are a few job announcements for faculty positions. 1. Virgina Tech CS: http://careers.pageuppeople.com/968/cw/en-us/job/510994 2. CU Boulder is hiring too: https://jobs.colorado.edu/jobs/JobDetail/?jobId=20915 3. more of a meta job announcement. If you want to know about jobs, I get a lot of random announcements and I forward them sporadically to this list, but of course most of you aren't looking most of the time. But here is a list of list of job announcements. https://twitter.com/quantum_aram/status/1182301671394701318 -aram _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

4 years, 7 months

[Aspuru-Guzik Group List] [qip] postdoc opportunity

by Aram Harrow

Dear Colleagues we would like to draw your attention to several postdoctoral openings in the Simons Collaboration on Ultra Quantum Matter (UQM) with a . Fall 2020 start date. We would appreciate your bringing this to the notice of interested individuals. Simons collaboration postdocs will be selected though a common application process. Although they will be associated with a single institution, they are free to work with all collaboration members and attend all meetings. The collaboration brings together condensed matter, high-energy, quantum information and atomic theorists with the goal of classifying and characterizing topological and fracton matter, developing dualities and other approaches to strongly coupled gapless phases, as well as finding novel platforms to realize and probe highly entangled quantum states in the laboratory. Applications can be submitted here <https://academicjobsonline.org/ajo/jobs/14972>. Applicants must indicate their preferred UQM institutions in their cover letter. The deadline is November 15 and more information can be found here <https://projects.iq.harvard.edu/ultra-qm/opportunities>. *California Institute of Technology* (Xie Chen) *Harvard University *(Subir Sachdev and Ashvin Vishwanath) *Stanford University* (Shamit Kachru) *University of California San Diego *(John McGreevy) *University of Colorado Boulder* (Victor Gurarie and Michael Hermele) *University of Maryland and Joint Quantum Institute* (Victor Galitski) *University of Texas Austin *(Andreas Karch) Other institutions and faculty participating in the collaboration are: *Institute for Advanced Study *(Nathan Seiberg) *Massachusetts Institute of Technology* (Senthil Todadri and Xiao-Gang Wen) *University of California Santa Barbara *(Leon Balents and Matthew Fisher) *University of Chicago* (Michael Levin and Dam Thanh Son) *University of Innsbruck *(Peter Zoller) _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

4 years, 7 months

[Aspuru-Guzik Group List] Joint Quantum Seminar - TODAY @ 4:30 - Prof. Arno Rauschenbeutel

by Ploucha, Clare

Joint Quantum Seminar Wednesday, October 9th 4:00 PM, Jefferson 250 Arno Rauschenbeutel (Humboldt-Universität zu Berlin) “Generation of correlated photons using non-interacting atoms weakly coupled to a guided optical mode” Typical schemes for generating correlated states of light require a highly nonlinear medium that is strongly coupled to an optical mode. However, unavoidable dissipative processes, which cause photon loss and blur nonlinear quantum effects, often impede such methods. In this seminar, I will report on a recent experimental demonstration of the opposite approach [1]. Using a strongly dissipative, weakly coupled medium, we generate and study strongly correlated states of light [2]. Specifically, we study the transmission of resonant light through an ensemble of non-interacting atoms that weakly couple to a guided optical mode. Dissipation removes uncorrelated photons while preferentially transmitting highly correlated photons created through collectively enhanced nonlinear interactions. As a result, the transmitted light constitutes a strongly correlated many-body state of light, revealed in the second-order correlation function. The latter exhibits strong antibunching or bunching, depending on the optical depth of the atomic ensemble. The demonstrated mechanism opens a new avenue for generating nonclassical states of light and for exploring correlations of photons in non-equilibrium systems using a mix of nonlinear and dissipative processes. Furthermore, our scheme may turn out useful in quantum information science. For example, it offers a fundamentally new approach to realizing single photon sources, which may outperform sources based on single quantum emitters with comparable coupling strength [3]. References [1] S. Mahmoodian, M. Čepulkovskis, S. Das, P. Lodahl, K. Hammerer, and A. S. Sørensen, Phys. Rev. Lett. 121, 143601 (2018). [2] A. Prasad, J. Hinney, S. Mahmoodian, K. Hammerer, S. Rind, P. Schneeweiss, A. S. Sørensen, J. Volz, and A. Rauschenbeutel, submitted (2019). [3] European patent pending (PCT/EP2019/075386) No ten-minute talk 4:00 pm: Refreshments 4:30 pm: Prof. Rauschenbeutel -- Clare Ploucha Director of Programs Harvard Quantum Initiative 17 Oxford Street, Jefferson 357 Cambridge, MA 02138 P: 617-495-3388

4 years, 7 months

[Aspuru-Guzik Group List] FW: CUA Seminar: Mark Saffman 10/8 @ Harvard

by Ploucha, Clare

Please see below for a talk that may be of interest to the HQI community. On 10/8/19, 7:23 AM, "Joanna K Welch" <j_k(a)mit.edu> wrote: Tuesday, October 8th Mark Saffman (University of Wisconsin) Harvard Jefferson 250 4pm - 10 Minute Talk by Pai Peng: “Probing Floquet prethermalization using quasi-conserved quantities” 4:15pm - Refreshments 4:30pm - Seminar start time Quantum gates in a 2D array of atomic qubits – towards quantum computational advantage I will present recent progress on demonstrating quantum gates with improved fidelity in a scalable 2D array of Cs atom qubits. Our roadmap for closing the remaining gap up to established theoretical limits for the fidelity of Rydberg entangling gates will be described, as well as perspectives on achieving a quantum computational advantage with atomic qubits in the next few years. Joanna Welch CUA Administrator MIT 26-237 j_k(a)mit.edu

4 years, 7 months

[Aspuru-Guzik Group List] Joint Quantum Seminar - Wednesday, October 9 @ 4:30 - Prof. Arno Rauschenbeutel

by Ploucha, Clare

Joint Quantum Seminar Wednesday, October 9th 4:00 PM, Jefferson 250 Arno Rauschenbeutel (Humboldt-Universität zu Berlin) “Generation of correlated photons using non-interacting atoms weakly coupled to a guided optical mode” Typical schemes for generating correlated states of light require a highly nonlinear medium that is strongly coupled to an optical mode. However, unavoidable dissipative processes, which cause photon loss and blur nonlinear quantum effects, often impede such methods. In this seminar, I will report on a recent experimental demonstration of the opposite approach [1]. Using a strongly dissipative, weakly coupled medium, we generate and study strongly correlated states of light [2]. Specifically, we study the transmission of resonant light through an ensemble of non-interacting atoms that weakly couple to a guided optical mode. Dissipation removes uncorrelated photons while preferentially transmitting highly correlated photons created through collectively enhanced nonlinear interactions. As a result, the transmitted light constitutes a strongly correlated many-body state of light, revealed in the second-order correlation function. The latter exhibits strong antibunching or bunching, depending on the optical depth of the atomic ensemble. The demonstrated mechanism opens a new avenue for generating nonclassical states of light and for exploring correlations of photons in non-equilibrium systems using a mix of nonlinear and dissipative processes. Furthermore, our scheme may turn out useful in quantum information science. For example, it offers a fundamentally new approach to realizing single photon sources, which may outperform sources based on single quantum emitters with comparable coupling strength [3]. References [1] S. Mahmoodian, M. Čepulkovskis, S. Das, P. Lodahl, K. Hammerer, and A. S. Sørensen, Phys. Rev. Lett. 121, 143601 (2018). [2] A. Prasad, J. Hinney, S. Mahmoodian, K. Hammerer, S. Rind, P. Schneeweiss, A. S. Sørensen, J. Volz, and A. Rauschenbeutel, submitted (2019). [3] European patent pending (PCT/EP2019/075386) No ten-minute talk 4:00 pm: Refreshments 4:30 pm: Prof. Rauschebeutel -- Clare Ploucha Director of Programs Harvard Quantum Initiative 17 Oxford Street, Jefferson 357 Cambridge, MA 02138 P: 617-495-3388

4 years, 7 months

[Aspuru-Guzik Group List] [qip] group meeting tomorrow and two CMT talks: Oct 4 and 22

by Aram Harrow

Dear quanta, Tomorrow we will have a group meeting at the usual time and place (11am, 6-310). Ramis will tell us about his work on quantum supremacy. There are also two talks in the CMT seminar series that may be of interest, one also tomorrow and the other in a few weeks. Friday, October 4, 2:00 PM. Zhicheng Yang, Joint Quantum Institute Path to building quantum spin liquids and topological qubits within existing quantum hardware Tuesday, October 22, 12:00 PM. Yichen Huang, Massachusetts Institute of Technology Renyi entanglement entropy in quantum many-body systems Abstracts for both talks are here: http://web.mit.edu/physics/cmt/informalseminar.html -aram _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

4 years, 8 months

[Aspuru-Guzik Group List] [qip] talk at 10am in 6-310: simulating field theories on a quantum computer

by Aram Harrow

This talk is starting in 35 minutes! ‘Simulation of field theories on a quantum computer’ Scott Lawrence (UMD) based on https://arxiv.org/abs/1908.10439 _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

4 years, 8 months

[Aspuru-Guzik Group List] Joint Quantum Seminar - TODAY @ 4:00 - Prof. Marcello Dalmonte

by Ploucha, Clare

Joint Quantum Seminar Wednesday, October 2nd 4:00 PM, Jefferson 250 Prof. Marcello Dalmonte, ICTP “Quantum simulating lattice gauge theories: ‘particle physics’ with Rydberg atom arrays” Gauge theories are the back-bone of our understanding of nature at the most fundamental level as captured by the standard model. Despite their elegance and conceptual simplicity, gauge theories have historically represented a major computational challenge in many-body theory - including, for instance, the real-time dynamics describing heavy-ion collisions at colliders, which is inaccessible to classical simulations based on Monte Carlo sampling. These challenges have motivated a flurry of theoretical activity over the last ten years, devoted at developing strategies for the quantum simulation of their discretized version - lattice gauge theories. In this first part of the talk, I will review the status of the field, highlighting potential applications as well as roadblocks, and discussing the first realization of gauge theory dynamics in a trapped ion quantum computer. In the second part of the talk, I will show how Rydberg atoms trapped in optical tweezers offer unprecedented opportunities for the realization of lattice gauge theories in AMO systems. In particular, I will describe how recent experiments have already realized the real-time dynamics of the lattice Schwinger model (the one-dimensional version of quantum electrodynamics) in the presence of a topological angle. Beyond demonstrating that quantum simulation of gauge theory is an experimental reality at large scales, the analogy between Rydberg atom arrays and gauge theories provides a powerful field theoretical tool to understand the slow-dynamics describing such systems - that immediately opens the door for its generalization to other models sharing the same field theoretical description. Finally, I will describe how other archetypical physical phenomena of lattice gauge theories - such as the effect of confinement on the dynamics, and the evolution of mesons - can be observed within the same platform. Matthias Zens (Vienna/ITAMP) “Variational Renormalization Group for Dissipative Spin-Cavity Systems: Periodic Pulses of Nonclassical Light from Mesoscopic Spin Ensembles” 4:00 pm: 10-minute Talk by Matthias Zens 4:10 pm: Refreshments 4:30 pm: Prof. Dalmonte -- Clare Ploucha Director of Programs Harvard Quantum Initiative 17 Oxford Street, Jefferson 357 Cambridge, MA 02138 P: 617-495-3388

4 years, 8 months

[Aspuru-Guzik Group List] Joint Quantum Seminar - Wednesday, October 2 @ 4:00 - Prof. Marcello Dalmonte

by Ploucha, Clare

Joint Quantum Seminar Wednesday, October 2nd 4:00 PM, Jefferson 250 Prof. Marcello Dalmonte, ICTP “Quantum simulating lattice gauge theories: ‘particle physics’ with Rydberg atom arrays” Gauge theories are the back-bone of our understanding of nature at the most fundamental level as captured by the standard model. Despite their elegance and conceptual simplicity, gauge theories have historically represented a major computational challenge in many-body theory - including, for instance, the real-time dynamics describing heavy-ion collisions at colliders, which is inaccessible to classical simulations based on Monte Carlo sampling. These challenges have motivated a flurry of theoretical activity over the last ten years, devoted at developing strategies for the quantum simulation of their discretized version - lattice gauge theories. In this first part of the talk, I will review the status of the field, highlighting potential applications as well as roadblocks, and discussing the first realization of gauge theory dynamics in a trapped ion quantum computer. In the second part of the talk, I will show how Rydberg atoms trapped in optical tweezers offer unprecedented opportunities for the realization of lattice gauge theories in AMO systems. In particular, I will describe how recent experiments have already realized the real-time dynamics of the lattice Schwinger model (the one-dimensional version of quantum electrodynamics) in the presence of a topological angle. Beyond demonstrating that quantum simulation of gauge theory is an experimental reality at large scales, the analogy between Rydberg atom arrays and gauge theories provides a powerful field theoretical tool to understand the slow-dynamics describing such systems - that immediately opens the door for its generalization to other models sharing the same field theoretical description. Finally, I will describe how other archetypical physical phenomena of lattice gauge theories - such as the effect of confinement on the dynamics, and the evolution of mesons - can be observed within the same platform. 4:00 pm: 10-minute Talk 4:10 pm: Refreshments 4:30 pm: Prof. Dalmonte -- Clare Ploucha Director of Programs Harvard Quantum Initiative 17 Oxford Street, Jefferson 357 Cambridge, MA 02138 P: 617-495-3388

4 years, 8 months

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

by Aram Harrow

Dear quanta, Let's meet tomorrow at 11am in 6-310. We'll plan to go around the room and have each person talk for 2-3 minutes about what they have been thinking about lately. aram _______________________________________________ qip mailing list qip(a)mit.edu http://mailman.mit.edu/mailman/listinfo/qip

4 years, 8 months

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