2014 Fall Graduate Colloquium Series: Brian Ko/Jared Fier

DateNovember 21, 2014Time3:35 - 5:00 pm
LocationBaylor Sciences Building, Room E.125
Description
Brian Ko

Quantum Key Distribution Using Rotation-Invariant Twisted Photons

In quantum key distribution (QKD), bits can be encoded in the polarization of photons. However, the polarization of light is highly sensitive to atmospheric turbulence, limiting its usefulness in long-distance communications. By creating specific hybrid states of polarization and orbital angular momentum (OAM), the misalignment of the OAM to atmospheric turbulence can be offset by the misalignment of the polarization, creating rotation-invariant photon states that can transmit encoded information across longer distances. The experimental design and results will also be discussed.

Phys. Rev. Letters, Vol. 113, 060503, 2014

Jared Fier

Observation of Majorana Fermions on a Superconductor

In the 1930s, the existence of a fermion that acted as its own antiparticle was predicted by Ettore Majorana. These fermions are predicted to be located around the edge of a topological superconductor. In a recent study, ferromagnetic chains were synthesized and placed on a superconductive Pb substrate. Using scanning tunneling microscopy, zero-bias peaks were observed at the edges of the Fe chain. These zerobias peaks are strong evidence for the existence of Majorana fermions in the Fe chains.

For more information, please contact: Dr. Ken Park 254-710-2282

PublisherDepartment of Physics
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