Thursday, February 16, 2017
11:00am – 12:00pm
Gant Plasa, IMS-159
Dr. Travis Nicholson, MIT/Harvard Center for Ultracold Atoms
Nonlinear Quantum Optics with Symmetry Protection
Realizing robust quantum phenomena in strongly interacting systems is one of the central challenges in modern physical science. Approaches ranging from topological protection to quantum error correction are currently being explored across many different experimental platforms, including electrons in condensed-matter systems, trapped atoms, and photons. Although photon–photon interactions are negligible in conventional optical media, we have engineered a system based on electromagnetically induced transparency and Rydberg states that realizes strong photonic interactions. Recently, we have learned that if the Rydberg state coupling is primarily dipolar, our system undergoes a coherent state exchange process that is accompanied by a large, robust phase shift. The phase shift is robust because it originates from the symmetry of the interaction rather than precise experimental parameters. Since interaction-induced phase shifts are needed for photonic quantum logic, our "symmetry protected" process opens a route to realizing all-optical quantum gates.
Contact: Prof. P. Gould
Prof. P. Gould
Physics Department (primary), UConn Master Calendar
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