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Scholars Day 2006, Wednesday, April 12

Stabilization of a Single-Photon Interferometer for One-Way Quantum Key Distribution Systems

The two major implementation schemes for Quantum Cryptography are Plug-and-Play and One-Way. The main weaknesses of the Plug-and-Play approach are relatively low key-generation rates due to Rayleigh scattering and increased vulnerability to Quantum attacks due to the geometry of the transmitting station, both of which can be eliminated in One-Way systems. One of the most practical implementations of the One-Way method when used with optical fiber is the Mach-Zehnder interferometer scheme. The greatest difficulty related to a robust implementation of such a system is the necessity for a continuous active control of the interferometer. To guarantee reliable operation, the phase of the interference curve must be stabilized with respect to various disturbances. Without stabilization, random phase drifts cause detections to lose any correlation with encodings. Presented here are the methodology of a developed solution, results from testing, and a preliminary simulation of QKD on a stabilized interferometer.

Presenter: Vasil Denchev (Undergraduate Student)
Topic: Computer Science
Location: 107 Holmes
Time: 9 am (Session I)