This technology is an entanglement assisted (EA) communications system that employs two pump lasers in order to more easily satisfy quasi-phase matching conditions. Rather than performing optical phase-conjugation (OPC) on signal photons, this technology transmits unmodulated idler photons alongside modulated signal photons without the use of OPC. This decreases the impact of atmospheric effects such as scattering, diffraction, absorption, and turbulence in free-space optical (FSO) applications. SLM-based beam steering is used to achieve the FSO link. Ultimately, this technology achieves a streamlined, low-cost, effective system for nondegenerate EA communications. Background: Nondegenerate EA communication techniques have been demonstrated to outperform classical lightwave communication techniques. EA communication is much more tolerant to the effects of atmospheric turbulence than classical communication. However, nondegenerate EA communication systems typically involve performing OPC on signal photons, which in FSO applications are highly affected by atmospheric effects. This technology bypasses the need for OPC and utilizes signal and idler photons. Applications:
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