This proposal develops a robust low size weight and power quantum entangled light source based on time-frequency encoded states. This configuration mitigates the phase stabilization requirements inherent in more conventional coherent quantum systems. An important aspect of the source is nonlinear optic conversion from a relatively short wavelength single photon source to a longer wavelength for low loss transmission over fibers or through a free space optical link. These elements typically require tight temperature control and can account for a substantial portion of the size weight and power budget for the source. This proposal integrates highly efficient and temperature tolerant nonlinear conversion components within the light source. Temperature tolerant design has the potential to minimize or even eliminate temperature control requirements, greatly reducing the size weight and power normally associated with tight temperature control. Potential NASA Applications (Limit 1500 characters, approximately 150 words): The Spontaneous Parametric Down Converter addresses a current NASA need for low size weight and power production of entangled photons for encrypted communications systems. The proposed device offers the best solution for low loss, high efficiency, compact and thermally stable packaging. Several companies have developed crucial technologies for quantum cryptography. Development of a temperature-tolerant low size weight and power device, such as that proposed here, will enable transition of these technologies to NASA space programs. Potential Non-NASA Applications (Limit 1500 characters, approximately 150 words): The proposed technology will provide increased information security at critical US infrastructure sites including power generation and distribution stations, government labs, and defense installations. Other uses include quantum optics research and computing. It also supports improved data security for prevention or reduction of cyber-crime, benefiting industry and the general public. Duration: 13
