Quantum State Transmission with QECC Tamper 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 against tampering, particularly when multiple relay nodes are involved, as they incur exponential overhead due to entanglement swapping and purification.
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), injecting an uncorrectable error, and transmitting a third quantum state to a receiving node, along with a syndrome for verification, using both quantum and classical channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If entanglement swapping and purification are performed multiple times over long distances, then transmission reliability is improved, but overhead increases exponentially
Solution Approach 1:
The patent extracts the verification function from the transmission process by introducing a separate verification qubit that independently checks for tampering. This allows reliability verification without requiring multiple rounds of entanglement swapping and purification, thereby reducing the exponential overhead while maintaining transmission reliability.
Solution Approach 2:
The verification qubit acts as an intermediary between the transmitted quantum state and the receiver. It mediates the security verification process by entangling with the transmitted state and allowing the receiver to detect tampering through measurement, eliminating the need for repeated purification protocols.
2Length of stationary object
If quantum states are transmitted over long distances via multiple relay nodes, then transmission range is extended, but security against tampering deteriorates
Solution Approach 1:
The patent applies preliminary action by preparing verification qubits in advance and entangling them with the transmitted quantum state before transmission. This pre-established entanglement allows the receiver to verify security at the end of the transmission chain, ensuring security against tampering even over long distances with multiple relay nodes.
Solution Approach 2:
The verification mechanism provides feedback about tampering through the correlation between the verification qubit and the transmitted state. The receiver can detect any tampering that occurred during transmission through multiple relay nodes by measuring the verification qubit and comparing results with the transmitted state, thus maintaining security awareness throughout the extended transmission range.
Data Source
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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.