Experimental results show optical decryption in quantum stream cipher systems, indicating potential for enhanced security.
We propose a coherent receiver with LO phase modulation and experimentally demonstrate penalty-less optical decryption of PSK Y-00 quantum stream ciphers. The decryption process is disaggregated from coherent DSP, facilitating seamless upgrade to secure systems.
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Tanizawa et al. (2025) studied this question.
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