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Events for March 09, 2011
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Decoherence of Polarization Entanglement in Optical Fibers With Polarization Mode Dispersion
Wed, Mar 09, 2011 @ 10:00 AM - 11:00 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Misha Brodsky, AT&T Labs
Talk Title: Decoherence of Polarization Entanglement in Optical Fibers With Polarization Mode Dispersion
Abstract: Quantum mechanics permits the existence of unique correlations, or entanglement, between individual particles. For a pair of entangled photons, this means that performing a measurement on one photon appears to affect the state of the other. The ability of entangled particles to act in concert is preserved even when they are separated by large distances and serves as a resource for numerous applications. For example, distributing entangled photon pairs over fiber-optic cables enables secure communication between two remote parties or could offer the possibility of interconnecting quantum computers. The vast transparency band of the installed global fiber-optic network, consisting of over a Gigameter of optical fiber cables, presents a particularly attractive opportunity for this task. The bond between entangled photons is, however, very fragile and could be lost.
Several physical phenomena set limitations on transmission of classical light pulses through optical fibers. An intriguing and crucial question is how some of these well-studied phenomena, for instance Polarization Mode Dispersion (PMD), affect a polarization entangled photon pair. How far could one send entangled photons while still maintaining the connection between them?
We investigate, theoretically and experimentally, how inherent defects and miniscule imperfections in fiber-optic cables degrade entanglement between two photons transmitted over fibers. We show that the loss of entanglement could be either gradual or surprisingly abrupt. In addition, we suggest a novel way to compensate for adverse effects that occur during propagation in fibers. Finally, we define the range of fiber parameters over which entanglement remains sufficient for secure communication. The richness of the observed phenomena suggests that fiber-based entanglement distribution systems could serve as natural laboratories for studying entanglement decoherence.
A brief introduction to the topic of the talk is available on the front page of AT&T Labs website: www.research.att.com
Biography: Dr. Misha Brodsky joined AT&T Labs in 2000. His contributions to fiber optic communications focused on optical transmission systems and physics of fiber propagation, most notably through his work on polarization effects in fiber-optic networks. More recently Misha has been working on quantum communications; single photon detection; where his prime research interest is in photon entanglement and entanglement decoherence mechanisms in optical fibers.
Dr. Brodsky has authored or co-authored over 70 journal and conference papers, a book chapter and about two dozen patent applications. He is a topical editor for Optics Letters and has been active on numerous program committees for IEEE Photonics Society and OSA conferences. Dr. Brodsky holds a PhD in Physics from MIT.
Host: Daniel Lidar
Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248
Audiences: Everyone Is Invited
Contact: Gerrielyn Ramos
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Technology Developments and R&D Challenges for Smart Grid Applications in Homes, Buildings, and Industry
Wed, Mar 09, 2011 @ 10:30 AM - 11:30 AM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Tariq Samad, Honeywell Automation and Control Solutions
Talk Title: Technology Developments and R&D Challenges for Smart Grid Applications in Homes, Buildings, and Industry
Series: CEI Distinguished Lecture Series in Energy Informatics
Abstract: The smart grid does not stop at the meter. Over 90% of the electricity generated in developed economies is consumed in homes, buildings and industrial plants. Greater attention must be paid to end-use sectors if the promised benefits of smart grids â such as reduction of electricity consumption, load shifting, better use of renewable generation and storage, reduced use of fossil fuels, and improved grid reliability â are to be achieved.
Dr. Samad will discuss current solutions that are already realizing such benefits, R&D activities under way, and outstanding challenges. The talk will cover automated demand response, remote energy diagnostics, home energy management systems, thermal storage, demand-management ancillary services, and micro-grid optimization. Current and proposed system architectures for such solutions will be presented, with examples from residential, commercial, and industrial sectors. Challenges for research as well as standards development will be discussed.
Biography: Tariq Samad is a Corporate Fellow with Honeywell Automation and Control Solutions, based in Minneapolis. His career with Honeywell has spanned 25 years, during which time he contributed to automation and control technology R&D with applications to electric power systems, the process industries, building management, automotive engines, unmanned aircraft, and clean energy. His research interests relate to automation, intelligence, and autonomy for complex engineering systems.
Dr. Samad is a Fellow of the IEEE, and served as the President of IEEE Control Systems Society in 2009 and the Editor-in-chief of IEEE Control Systems Magazine. He is General Chair for the 2012 American Control Conference and is on the editorial board of IEEE Press. He holds 17 patents and has (co)authored over 100 publications. He represents Honeywell on the Global Carbon Capture and Storage Institute, and is a member of the Governing Board of the U.S. Smart Grid Interoperability Panel. He holds a B.S. in Engineering and Applied Science from Yale University and M.S. and Ph.D. in Electrical and Computer Engineering from Carnegie Mellon University.
Host: Prof. S. Joe Qin and Prof. Viktor Prasanna
More Info: http://cei.usc.edu/news/lecturesLocation: Seeley G. Mudd Building (SGM) - 101
Audiences: Everyone Is Invited
Contact: Yogesh Simmhan
Event Link: http://cei.usc.edu/news/lectures
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EE-Electrophysics Seminar
Wed, Mar 09, 2011 @ 02:30 PM - 03:30 PM
Ming Hsieh Department of Electrical and Computer Engineering
Conferences, Lectures, & Seminars
Speaker: Faxian Xiu, Electrical Engineering Department at UCLA
Talk Title: Magnetic Nanomaterials and Nanodevices - Emerging Strategies for Beating Mooreâs Law
Abstract: Magnetic nanomaterials have potentials for developing new-generation electric devices to resolve power consumptions and variability issues in todayâs microelectronics industry. In this talk, I will present my recent research on the development of high-Curie-temperature Mn0.05Ge0.95 quantum dots with a ferromagnetic order above room temperature. I will describe an approach to probe the electric-field control of ferromagnetism in this material and demonstrate the operation temperature up to 300 K. I will also briefly discuss some of recent advance in voltage-controlled surface states in topological insulator Bi2Te3 nanoribbons. The surface states of the topological nanoribbon can be significantly enhanced up to 51 % by applying an external gate voltage. These novel magnetic and electronic materials could be potentially used for the long-sought power dissipationless applications.
Biography: Dr. Faxian Xiu is currently a staff research associate with the Electrical Engineering department at UCLA. He is associated with two research centers in California: the Functional Engineered Nano Architectonics Center and the Western Institute of Nanoelectronics. He received his Masters degree in Materials Science and Engineering from the same university in 2002, and his Ph. D. degree from the Electrical Engineering at UC Riverside in 2007. After his Ph.D., he worked for ZN technology Incorporation for two years before he joined UCLA as a staff research associate.
Dr. Xiu has interdisciplinary background involving both materials science and electrical engineering. He has over 40 peer-reviewed publications and received numerous media attention on his work of dilute magnetic semiconductors. His current research interest includes spintronic and nanoelectronic devices based on the Mn-doped Ge quantum dots and topological insulator nanoribbons.
Host: EE-Electrophysics
More Info: http://ee.usc.edu/news/seminars/eepLocation: Hedco Neurosciences Building (HNB) - 100
Audiences: Everyone Is Invited
Contact: Marilyn Poplawski
Event Link: http://ee.usc.edu/news/seminars/eep
