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Physics Conference Room, SB B326
Coffee starts at 12:00 PM and talk starts at 12:15 PM
Aug '20
Flaviano Morone  -  Monday, August 31, 2020
Symmetry in biological networks
Memorial Sloan Kettering Cancer Center
PDFDownload PDF locationzoom.us talk time12:15 pm
ABSTRACT: Azriel Genack is inviting you to a scheduled Zoom meeting.

Topic: Colloquium: Flaviano Morone 
Time: Aug 31, 2020 12:00 PM Eastern Time (US and Canada)

Meeting ID: 960 7283 3023
Passcode: 4935283638

NOTES: Online event
Sep '20
Christopher Wilson  -  Monday, September 21, 2020
Quantum Simulation and Computation with Microwave Photons
Institute for Quantum Computing, University of Waterloo
PDFDownload PDF locationOnline at zoom.us talk time12:15 pm
ABSTRACT: Optical quantum computing (OQC) is a major paradigm of quantum information. In standard OQC, quantum information is processed by laser light traveling on a large table top. Over the last several years, we have worked to develop an alternative approach using microwave photons traveling on-chip in a superconducting circuit. Using superconducting parametric cavities, we have already demonstrated much of the toolbox of linear quantum optics, but also extended it by taking advantage of the strong nonlinearities of superconducting circuits. In this talk, we present a series of experiments demonstrating the capability of this system. In a first, we show that we can create genuine tripartite entanglement of propagating microwave photons. The approach used is easily scalable to more modes. In a second set of experiments, we use the parametric cavities as a platform for analog quantum simulation of lattice field theories.  Preliminary results already show the promise of the platform for this application.  For instance, a single device can simulate a number of different models, including topological and chiral models, in a flexible and programmable way. Finally, we look at experimental progress towards generating a type of “magic state” for OQC called the cubic-phase state, which has remained elusive to experimenters in traditional quantum optics.  The cubic-phase state and its relatives would allow universal quantum computation using linear quantum optics. We have successfully generated non-Gaussian generalized squeezed states across one, two and three modes, which are an important experimental step towards these magic states.

About the Presenter
Christopher Wilson received his B.S. in Physics from MIT in 1996. There he performed undergraduate research on the role of nonlinear dynamics in the nervous system using analog circuit simulators. He received his Ph.D. in Physics from Yale University in 2002. His dissertation focused on the development of single-photon optical spectrometers using superconducting tunnel junctions.  He then worked at Yale as the W.M. Keck postdoctoral fellow where he started work on quantum computation and information processing using superconducting single-electronics. In 2004, he moved to Chalmers University of Technology in Sweden, later becoming an assistant professor in 2007 and an associate professor in 2011. In 2011/2012, he spent a sabbatical year working at a biomedical startup company in Pasadena, where we worked on signal processing and machine learning for medical diagnostics.  Starting in 2012, he became an associate professor at the University of Waterloo, where he holds appointments in the Department of Electrical & Computer Engineering and the Institute for Quantum Computing.  He was appointed professor in 2017 and has served as the Director of the Graduate Program at IQC since 2018. His research focuses on applications of superconducting quantum electronics to quantum information, computing and sensing and the foundations of quantum mechanics. His work has been recognized internationally, receiving the 2012 Wallmark prize from the Royal Swedish Academy and being named one of the top 5 breakthroughs of 2011 by Physics World magazine.

Attending this Meeting
Mohammad Miri is inviting you to a scheduled Zoom meeting.

Topic: Colloquium : Christopher Wilson
Time: Sep 21, 2020 12:15 PM Eastern Time (US and Canada)

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Meeting ID: 996 1744 6833
Passcode: 545570
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Oct '20
Can-Ming Hu  -  Monday, October 5, 2020
Unidirectional Invisibility in Cavity Magnonics
University of Manitoba, Canada
ABSTRACT: Cavity Magnonics (also known as Cavity Spintronics [1] and Spin Cavitronics) is an emerging field that studies the strong coupling between cavity photons and collective spin excitations such as magnons. It connects some of the most exciting modern physics, such as quantum information and quantum optics, with one of the oldest science on the earth, the magnetism. 
So far, most studies in this new field have been focused on coherent magnon-photon coupling, which enables diverse transducing functions in quantum and spintronics systems [2]. In this talk I will introduce an intriguing dissipative magnon-photon coupling governed by a non-Hermitian Hamiltonian [3], which describes the physics of open quantum systems. It leads to level attraction [3], exceptional points [4], and nonreciprocal photon transmission [5]. This stream of research may open the avenue for developing open cavity magnonics that enables directional control of quantum and spintronics systems.
[1] C.-M. Hu, Phys. in Canada, 72, No. 2, 76 (2016); Y.P. Wang and C.-M. Hu, J. Appl. Phys. 127, 130901 (2020).
[2] D. Lachance-Quirion, et al., Appl. Phys. Express 12, 070101 (2019).
[3] M. Harder, et al., Phys. Rev. Lett., 121, 137203 (2018).
[4] D. Zhang, et al., Nat. Commun. 8, 1368 (2017).
[5] Yi-Pu Wang, et al., Phys. Rev. Lett., 123, 127202 (2019).
Oct '20
Demitry Farfurnik  -  Monday, October 19, 2020
Spin control of quantum dots toward quantum photonic applications
The Quantum Photonics lab, University of Maryland
PDFDownload PDF iCaliCal file GoogleAdd to Google Calendar locationOnline at zoom.us talk time12:15 pm
ABSTRACT: The remarkable photonic properties of self-assembled quantum dots position them as promising platforms for quantum computation, communication, and the realization of quantum networks. In particular, the strong coupling between quantum dot spins to photonic structures enables the generation of spin-photon and photon-photon entanglement. In this talk, I will present recent developments in the implementation of arbitrary sequenced control of the quantum dot spin, which incorporate optimized microwave waveform generation and electro-optical modulation. Such a versatile control leads to prolonged quantum dot coherence times essential for quantum information storage, and enhances spin and photon entanglement manipulation capabilities utilizing photonic crystal cavities.  Finally, by introducing the system of quantum dot “molecules” that feature a decoherence-free subspace, I will emphasize the potential of such spin control techniques toward the realization of hybrid photonic interfaces.
Nov '20
Ricardo Herbonnet  -  Monday, November 2, 2020
ABSTRACT: In the last few decades astronomical observations have revealed the strange nature of the Universe. Observations of phenomena at vastly different ages of the Universe consistently require more than baryonic matter and baryonic physics to be explained. Both dark energy, the cause of the accelerated expansion of the Universe, and dark matter, mostly responsible for the gravitational build-up of large scale structure in the Universe, have, to date, no clear physical explanation. By putting strong limits on the energy density of these dark components with astronomical observations, theoretical models of dark matter and dark energy can be tested and refined.

A promising tool is to study the growth of structure through cosmic time. Higher density of dark matter in the Universe leads to more clustered matter distributions at the present time, whereas dark energy pulls these structures apart. Therefore, by measuring the number and mass of large objects in the Universe, we can determine the energy density of the dark components. The largest objects in the Universe are galaxy clusters and their rarity makes them a very powerful probe of cosmology. Approximately 85% of the mass of clusters is in the form of dark matter and and requires a probe of gravitating mass to be weighed. Mass estimates based on the baryonic content of the cluster are known to be biased from simulations, but gravitational lensing provides the tool to measure an unbiased total mass of dark matter and light-emitting matter. The combination of gravitational lensing with baryonic mass proxies is the key to galaxy cluster cosmology.

I will review how galaxy clusters are found and discuss the latest gravitational lensing measurements of galaxy clusters and their impact on cosmology.​

Nov '20
Danniel Brunner  -  Monday, November 9, 2020
FEMTO-ST Institute, France
Nov '20
Olivier Bournez  -  Monday, November 16, 2020
A Survey on Continuous Time Computations
Department of Computer Science of Ecole Polytechnique, Frnace
Nov '20
Diego Porras  -  Monday, November 23, 2020
Topological Amplification in Photonic Lattices
Institute of Fundamental Physics CSIC, Madrid
ABSTRACT: Directional amplification of light in non-reciprocal photonic systems is an exciting effect with applications in measurements of weak signals and quantum information processing. Here we examine this effect from the point of view of topology. We show that there is a correspondence between directional amplification and the existence of a topological non-trivial phase that is the photonic analogous of a topological insulator. This surprising connection will allow us to use topological band theory to predict the performance of quantum amplifiers and sensors based on the symmetries of the underlying photonic lattice.