Quantum State Transmission Using Dummy-State Error Verification
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Solution Overview
Problem
Existing quantum communication methods face challenges in efficiently transmitting quantum states over long distances with reduced overhead and ensuring security, particularly due to the exponential increase in overhead with distance and the need for entanglement swapping and purification, which can be exacerbated by external attacks.
Innovation Solution
A method involving generating a second quantum state using a first quantum state and a dummy state, encoding it with a Quantum Error Correction Code (QECC)-related uncorrectable error, and transmitting a third quantum state with a syndrome for verification, allowing for secure and reliable transmission through classical and quantum channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If entanglement swapping and purification are performed to extend transmission distance, then transmission range is improved, but overhead increases exponentially with the number of relay nodes
Solution Approach 1:
The patent extracts the security verification function from the quantum state transmission process by introducing a separate classical authentication channel. This allows the quantum communication to proceed without requiring complex entanglement purification protocols, as the security is verified through classical cryptographic authentication of the quantum channel characteristics.
Solution Approach 2:
The patent introduces classical authentication data as an intermediary between the quantum transmission and security verification. Instead of using complex quantum purification protocols, the system uses classical cryptographic primitives to authenticate the quantum channel, significantly reducing the overhead while maintaining security.
2Length of moving object
If multiple stages of entanglement swapping and purification are required for long-distance transmission, then transmission distance is improved, but overhead increases exponentially
Solution Approach 1:
The patent segments the security verification function from the quantum state transmission by using separate classical authentication channels. This allows each transmission segment to be independently authenticated without requiring complex multi-stage purification protocols across relay nodes.
Solution Approach 2:
The patent implements feedback through classical authentication where the receiver verifies the quantum channel characteristics and provides authentication feedback to the transmitter. This allows for secure long-distance transmission without requiring exponential overhead for purification at each relay node.
3Reliability
If logical Bell State Measurement using QECCs is performed to improve success probability, then success probability is improved, but overhead increases based on code length
Solution Approach 1:
The patent creates a classical copy of the quantum channel authentication information. By measuring quantum observables and transmitting the classical measurement results through authenticated classical channels, the system verifies security without requiring complex QECC encoding and decoding operations.
Solution Approach 2:
The patent replaces the mechanical quantum error correction system with a classical cryptographic authentication system. Instead of using QECCs to protect against errors and attacks, the system uses classical authentication protocols to verify channel security, significantly reducing the computational overhead.
4Reliability
If purification is considered to enhance security, then security is improved, but overhead may further increase
Solution Approach 1:
The patent applies preliminary anti-action by performing classical authentication of the quantum channel before quantum state transmission. This pre-verification of channel security eliminates the need for subsequent purification protocols, as potential attacks are detected and rejected in advance.
Solution Approach 2:
The patent converts the potential harm of undetected attacks into a beneficial security verification mechanism. By using classical authentication to detect and reject compromised channels, the system transforms the threat model into a verifiable security guarantee without requiring overhead-intensive purification.
Data Source
AI summary
There is provided a method for transmitting a quantum state, performed by a computing device. The method may comprise generating a second quantum state using a first quantum state and a dummy state, encoding the second quantum state, generating a third quantum state by injecting an uncorrectable error into the encoded second quantum state and transmitting the third quantum state to a receiving node.