MUMBAI, India, June 30 -- Intellectual Property India has published a patent application (202541057794 A) filed by Indian Institute Of Technology Madras Iit Madras on June 16, 2025, for Quantum Money Using Differential Phase Encoding.
Inventors include Anil Prabhakar; Ashutosh Kumar Singh; Nilesh Sharma; and Vaibhav Pratap Singh.
The application for the patent was published on June 26, 2026, under issue no. 26/2026.
Abstract: ABSTRACT QUANTUM MONEY USING DIFFERENTIAL PHASE ENCODING The present invention discloses a secure quantum money transaction system utilizing differential phase encoding of photons, ensuring inherent unforgeability and unclonability based on quantum mechanics principles. It involves three key parties: a trusted Bank, Clients, and Merchants, interconnected via quantum channels. The Bank generates quantum currency encoded with a secret phase sequence, which the Client and Merchant further encode using their own secret keys before returning it to the Bank for verification. Verification employs a delay line interferometer and single-photon detectors to confirm transaction authenticity without revealing secret keys. This private quantum money scheme mitigates risks like double spending and malicious activity, while supporting scalable deployment across multiple Banks, Clients, and Merchants. Utilizing existing photonic technologies, the invention offers a practical, information-theoretically secure alternative to classical and public quantum money systems vulnerable to quantum computer attacks. Figure. 1
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