Events at Physics

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Events on Friday, October 2nd, 2015

Atomic Physics Seminar
Advanced quantum communication using hyperentangled photons
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Trent Graham , Urbana-Champaign
Abstract: Photons are the perfect "flying qubits" for quantum communication: they travel at the speed of light and have only weak nonlinear interactions with their environment. While these features make photons ideal carriers of quantum information, many quantum communication protocols require qubits to interact in quantum logic gates. Although interactions between individual photons are too weak for reliable multi-qubit gates, it is relatively easy to implement efficient gates between different degrees of freedom encoded on the same photon. By using photons that are simultaneously entangled in multiple degrees of freedom ("hyperentangled") we can perform operations that are impossible for single-qubit states, as well as gain access to higher dimensional entanglement. We demonstrate that hyperentangled states can be used for efficient quantum state communication, increased classical channel capacity, and more efficient quantum channel characterization.
Host: Saffman
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Physics Department Colloquium
Taming Turbulence in Magnetized Plasmas: From Plasmas for Fusion Energy to Black Hole Accretion Disks
Time: 3:30 pm - 4:30 pm
Place: Chamberlin 2241 (coffee & Cookies at 3:15pm)
Speaker: Troy Carter, UCLA
Abstract: Plasmas in the laboratory and in astrophysical settings vary widely in parameters (e.g. temperature and density) but have one thing in common: they are plagued by instability. Instabilities and associated turbulence are detrimental in laboratory plasmas for fusion energy research, causing heat, particles and momentum to "leak" across the confining magnetic field. In astrophysical plasmas like accretion disks, turbulence is often essential to explain observed rates of momentum transport and accretion. I will talk about instabilities and turbulence in magnetized plasmas and their relevance to achieving magnetic confinement fusion in the laboratory and understanding processes in astrophysical plasmas.
Host: Forest
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