MUMBAI, India, May 29 -- Intellectual Property India has published a patent application (202641062185 A) filed by Vellore Institute Of Technology, Vellore, Tamil Nadu, on May 15, for 'system and method for pilot-aided phase recovery in continuous variable quantum key distribution using chaotic non-gaussian modulation.'
Inventor(s) include Dr Mugelan RK; Dr Swetha NG; Sanaputur Sai Charan; K Sai Akhil; and Sunsitha Varshini Pugalaendhi.
The application for the patent was published on May 29, under issue no. 22/2026.
According to the abstract released by the Intellectual Property India: "The present invention relates to a continuous variable quantum key distribution (CV-QKD) system and method for phase recovery under phase drift conditions. Quadrature signals are generated using deterministic chaotic modulation to produce non-Gaussian quadrature states, which are used to modulate coherent optical pulses. Structured pilot signals arranged as alternating cosine-probe and sine-probe pairs are inserted into the transmitted sequence to enable phase estimation using homodyne detection. At a receiver, phase drift is estimated based on measurements of the structured pilot pairs, and phase correction is applied to compensate for channel-induced phase variations. The corrected quadrature values are used for channel parameter estimation and secure key generation. The system integrates modulation, pilot-assisted phase estimation, phase correction, and key extraction within a unified architecture for quantum communication."
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