Work

Intradyne coherent receiver with optical decryption for disaggregated PSK Y-00 cipher transceiver architecture

Year: 2026

Type: article

Abstract: The Y-00 quantum stream cipher utilizes the effect of quantum noise on optical signals and realizes signal-level symmetric-key encryption to protect interception in optical communication. A transceiver architecture that disaggregates encryption/decryption and modulation/demodulation in the optical domain facilitates the migration of Y-00 cipher to current digital-coherent communication systems. This paper presents a polarization-diversity intradyne Y-00 coherent receiver where local oscillator light is modulated for decryption. Polarization-diversity optical decryption and detection are simultaneously achieved using a typical optical 90-degree hybrid circuit and a conventional polarization-sensitive electro-optic modulator. Penalty-less detection with the decryption is demonstrated in 5-Gbit/s PSK Y-00 cipher transmission over fiber and free-space links, facilitating the disaggregation of decryption and demodulation.

Source: Optics Express

DOI: 10.1364/oe.586652

Authors: Ken Tanizawa, Fumio Futami

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: Japan Society for the Promotion of Science

Award: Truly record-proof physical layer encryption based on quantum uncertainty principle for optical communications