This technology proposes a new receiver design employing 2x2 optical hybrid receiver to optimize entanglement-assisted communication specifically using Binary Phase-Shift Keying (BPSK). This new method leverages prior work that discovered that pre-shared entanglement allowed for higher communications rates and optimizing the receiver now allows for significantly higher communication rates compared to conventionally (Holevo and Homodyne) capacities. This technology increases the security in free-space optical transmission and reduces the probability of interception of the technology. This technology is applicable to various defense applications including radars, communication in contested environment, hypersonic communications, to mention few. Background: Quantum Information Processing (QIP) has seen tremendous progress in recent decades, with multiple research directions exploring quantum sensing, covert communication, quantum cryptography, and more. Quantum channels are used to transfer quantum and/or classical information securely from one party to another, but if the channel is noisy, the quantum information undergoes some changes. Entanglement, or the strong correlation between particles, in quantum information science can be leveraged to provide a better communication rate over quantum channels. However, challenges remain in the practical realization of entanglement: transmitting entanglement over long distances is challenging, and the optimum quantum receiver to achieve entanglement-assisted channel capacity has not yet been derived. Applications:
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