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Entanglement Distribution Over Atmospheric Turbulence Channels Enabled by Adaptive Optics
This innovation is a system and method for using free-space optical (FSO) links to distribute entanglement and use adaptive optics to deal with the effects of atmospheric turbulence. To generate entangled photons, the system uses mature telecommunications devices like a C-band tunable laser, periodically poled Lithium Niobate (PPLN) waveguides, and...
Published: 11/4/2025
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Inventor(s): Ivan Djordjevic, Vijay Nafria
Keywords(s):
Category(s): Technology Classifications > Engineering & Physical Sciences > Communications & Networking, Technology Classifications > Engineering & Physical Sciences > Photonics, Technology Classifications > Imaging & Optics > Sensors and Detection
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Low Probability to Intercept and Covert Communications over Atmospheric Turbulent Channels
This technology uses applied digital modulation and a thermal source signal to communicate though turbulent free-space optical. It also adds noise in select signal ranges to enable covert communication with lower probability of interception.
Background:
This technology increases the security in free-space optical transmission and reduces the probability...
Published: 11/4/2025
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Inventor(s): Ivan Djordjevic, Vijay Nafria
Keywords(s):
Category(s): Technology Classifications > Engineering & Physical Sciences > Communications & Networking, Technology Classifications > Imaging & Optics > Lasers & Other Sources
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Entanglement Assisted LPI and Covert Communications with SLM-based Beam Steering over Turbulent Optical Channels
This invention enables high-speed covert optical communication using entanglement-assisted transmission and spatial light modulators (SLM) for beam steering. This technology achieves better performance over turbulence than classical systems without requiring phase conjugation.
Background:
Covert optical communication technologies are becoming more...
Published: 10/21/2025
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Inventor(s): Ivan Djordjevic, Ignacio Rojas
Keywords(s):
Category(s): Technology Classifications > Engineering & Physical Sciences > Communications & Networking, Technology Classifications > Engineering & Physical Sciences > Quantum
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Two-Pumps-Based Degenerate Entanglement Assisted Communication with SLM-Based Beam Pointing
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...
Published: 9/22/2025
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Inventor(s): Ivan Djordjevic, Ignacio Rojas
Keywords(s):
Category(s): Technology Classifications > Engineering & Physical Sciences > Communications & Networking, Technology Classifications > Engineering & Physical Sciences > Quantum
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Covert Free-Space Optical Communications with SLM-Based Beam Steering
This is a system for secure low probability of detection communications across a free-space optical (FSO) channel. The system utilizes an LED-based source which transmits signals with distributions that match the distribution of the background solar radiation, which hides the signals. The transmitted signals are modulated according to a phase-shift...
Published: 9/22/2025
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Inventor(s): Ivan Djordjevic, Ignacio Rojas
Keywords(s):
Category(s): Technology Classifications > Engineering & Physical Sciences > Communications & Networking, Technology Classifications > Imaging & Optics > Materials & Fabrication
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High Secret-Key Rate Atmospheric Turbulence-Based Cryptosystems
This technology is a cryptosystem that utilizes atmospheric turbulence over a communication channel as a source of randomness. The cryptosystem utilizes bidirectional modulators at both ends of the communication to remodulate received signals. This method enables key generation and the generation of random sequences to occur independent of the long...
Published: 8/13/2025
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Inventor(s): Ivan Djordjevic
Keywords(s):
Category(s): Technology Classifications > Engineering & Physical Sciences > Quantum, Technology Classifications > Engineering & Physical Sciences > Communications & Networking, Technology Classifications > Software & Information Technology > Security
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Secret Key Distillation over Realistic Satellite-to-Satellite Free-Space Channel Defense Strategy: Exclusion Zone Analysis
Quantum Key Distribution (QKD) is a system made possible by the advances in quantum computing and entanglement-assisted communication. QKD is currently in use for some companies trying to encrypt and secure their information in a way that makes it practically impossible to “crack” the encryption. The question then becomes: what is the limit...
Published: 6/17/2025
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Inventor(s): Ziwen Pan, Ivan Djordjevic
Keywords(s):
Category(s): Technology Classifications > Engineering & Physical Sciences > Communications & Networking > Networking, Technology Classifications > Engineering & Physical Sciences > Communications & Networking > Wireless
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Degenerate Entanglement Assisted Communications
Degenerate Entanglement Assisted Communications is a cutting-edge quantum communication technology designed to significantly enhance data transmission efficiency while maintaining high security. This innovation eliminates the need for optical phase conjugation (OPC), a common limitation in traditional quantum communication systems, by leveraging degenerate...
Published: 2/17/2025
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Inventor(s): Ivan Djordjevic, Vijay Nafria
Keywords(s):
Category(s): Technology Classifications > Engineering & Physical Sciences > Quantum, Technology Classifications > Engineering & Physical Sciences > Communications & Networking, Technology Classifications > Software & Information Technology > Communications & Networking
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A Method for Encoding, Encrypting and Decrypting Information using Phi-Bits (Acoustic Analogues of Qubits)
This invention addresses the need for robust data security in the face of emerging quantum computing risks and presents logical phi-bits as a promising solution for encryption in the digital age. This cryptography method uses logical phi-bits, which are classical analogues of quantum bits (qubits) and are supported by driven acoustic metamaterials....
Published: 11/25/2024
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Inventor(s): Pierre Deymier, Keith Runge, Akinsanmi Ige, David Cavalluzzi, Ivan Djordjevic
Keywords(s):
Category(s): Technology Classifications > Engineering & Physical Sciences > Quantum, Technology Classifications > Software & Information Technology > Security, Technology Classifications > Engineering & Physical Sciences > Communications & Networking
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Amplified Entanglement Assisted Communication Outperforming Classical Laser Communication in Strong Atmospheric Turbulence Regime
Contrary to the common belief that quantum entanglement is destroyed by amplification, in entanglement-assisted communication systems dominated by attenuation effects rather than noise, the signal photons can be amplified by the erbium-doped fiber amplifier (EDFA) without destroying the entanglement. The inventors developed a terrestrial free-space...
Published: 3/19/2025
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Inventor(s): Ivan Djordjevic, Vijay Nafria
Keywords(s):
Category(s): Technology Classifications > Engineering & Physical Sciences > Quantum, Technology Classifications > Engineering & Physical Sciences > Communications & Networking
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