One-Way Quantum Secure Direct Communication to Reduce State Loss
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Solution Overview
Problem
Quantum secure direct communication methods face challenges with high quantum state loss and limited transmission distance due to two-way transmission methods.
Innovation Solution
A quantum secure direct communication method utilizing one-way transmission, involving error-correction anti-loss encoding, encryption with negotiated keys, and encoding ciphertext messages onto quantum states, along with eavesdropping detection and key generation techniques, to enhance security and distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-way transmission method is used in quantum secure direct communication, then eavesdropping detection can be performed, but quantum state loss increases and transmission distance is limited
Solution Approach 1:
The patent inverts the conventional two-way transmission approach by implementing a one-way transmission method where only the sender (Alice) prepares and transmits quantum states, while the receiver (Bob) performs measurements and eavesdropping detection. This inversion eliminates the need for Bob to prepare and send quantum states back, thereby reducing quantum state loss and extending transmission distance while maintaining eavesdropping detection capability through Alice's transmitted states.
2Reliability
If two-way transmission method is used, then communication security can be verified, but transmission distance is shortened
Solution Approach 1:
The patent applies inversion by making Alice the sole preparer of quantum states that travel from her end to Bob's end, eliminating the return trip of quantum states. This one-way approach reduces the total transmission distance required for security verification while maintaining the ability to detect eavesdropping through the quantum states Alice transmits to Bob.
3Reliability
If conventional quantum communication methods are used, then encryption can be implemented, but system complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex two-way quantum state preparation and transmission processes by implementing a simplified one-way transmission model. Only Alice prepares and transmits quantum states, while Bob performs local measurements and eavesdropping detection. This extraction of unnecessary components reduces system complexity while maintaining encryption capability through the quantum key distribution protocol.
Data Source
AI summary
The present application relates to a quantum secure direct communication method and apparatus based on a one-way transmission, a device and a system. The transmitting terminal performs the error-correction anti-loss encoding on the to-be-transmitted message to obtain the code word corresponding to the to-be-transmitted message. The encryption key negotiated with the receiving terminal is adopted to encrypt the code word and the ciphertext message corresponding to the code word is obtained. Further, the ciphertext message is encoded onto the quantum state, and the obtained quantum state information is transmitted to the receiving terminal through the quantum channel.