Procedures and systems for ensuring trustworthy communication

The method addresses data security against quantum computer attacks by using entangled and squeezed quantum states to verify data integrity, ensuring trustworthy communication with reduced encryption costs and frequent verification.

DE102024131529B4Active Publication Date: 2026-06-03DEUTSCHE TELEKOM AG
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
DEUTSCHE TELEKOM AG
Filing Date
2024-10-29
Publication Date
2026-06-03

AI Technical Summary

Technical Problem

Existing cryptographic methods are insufficient to secure data transmission against quantum computer attacks, and comprehensive encryption using quantum mechanical principles is expensive and not widely implemented.

Method used

A method using entangled and squeezed quantum states to ensure trustworthy communication by superimposing a classical optical signal with a photonic signal of an entangled squeezed quantum state, allowing verification of data integrity through homodyne measurements without encryption, using communication modules connected via an optical channel.

Benefits of technology

Ensures data trustworthiness by detecting unauthorized access attempts, reducing the need for continuous encryption and lowering the generation and exchange rates of quantum states, while maintaining data integrity and confidentiality.

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Abstract

The invention relates to a solution for ensuring trustworthy communication between two communication partners who, when exchanging user data, are connected to each other via an optical communication channel (4) by means of a communication module (1, 2) each, wherein "Bob" is enabled to verify whether the received user data has remained unchanged during its transmission. For this purpose, a classical optical carrier signal used for transmitting the user data is superimposed with the photonic signal of an entangled squeezed quantum state mediating an entanglement relationship before modulation with user data, generating a quantum-classical signal.The received modulated quantum-classical signal is subjected to a homodyne measurement in the communication module (2) after superposition with a laser beam generated by a local oscillator (10), and the result is checked by comparison with the result of a homodyne measurement on the entangled squeezed quantum state present locally at the communication module (2) to see whether a correlation originally existing between the expectation values ​​of the entangled squeezed quantum states has been preserved during data transmission.
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