Enabling Technologies for Free Space Quantum Cryptography

We propose to demonstrate the feasibility of two novel optical subsystems within a new optical embodiment for quantum key distribution. The configuration is potentially scalable for space-based implementations of quantum key distribution. The proposed technology utilizes optical control systems that substantially improve the practicality of quantum key distribution. If proven feasible, the technology can also lead to potential improvements in speed and link-budget with reduced transceiver size, weight and power for future free-space laser communication systems, which will also benefit the application of QKD to satellite communications. The proposed technology is a modification of proven multiplexing techniques recently developed by the principle investigator to achieve ultra-long-distance and ultra-high-bit rate communications for commercial fiber optic systems.