Quantum Direct Communication Using Single Qubits
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Solution Overview
Problem
Existing quantum direct communication techniques face challenges in practical implementation due to low generation efficiency of quantum entanglement states and lack of entity authentication, making secure communication difficult without pre-shared keys.
Innovation Solution
A method and apparatus for quantum direct communication using single qubits that integrate entity authentication by preparing and transmitting quantum states including message, authentication, and verification states, allowing secure communication between legitimate users without pre-shared keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum entanglement states are used as quantum sources, then secure communication can be achieved, but generation efficiency is very low and states are maintained for a short period of time
Solution Approach 1:
The patent replaces quantum entanglement states with single qubits that are easier to generate and maintain. Single qubits can be prepared independently and do not require the complex entanglement generation process, thus improving generation efficiency while maintaining security through quantum state preparation and measurement protocols.
Solution Approach 2:
The patent changes the quantum state parameter from entangled multi-qubit states to single qubit states. This parameter change simplifies the generation process and extends the maintenance time of quantum states, as single qubits are more stable and easier to control in practical communication environments.
2Reliability
If quantum entanglement states are used as quantum sources, then secure communication can be achieved, but states are maintained for a short period of time
Solution Approach 1:
The patent uses single qubits that can be continuously prepared and transmitted without the need for maintaining complex entangled states over time. Each single qubit can be independently prepared and transmitted, extending the effective communication window without relying on long-lived entangled states.
3Reliability
If existing quantum direct communication techniques are used, then secure communication can be achieved, but entity authentication for a communication partner is not performed in advance
Solution Approach 1:
The patent incorporates entity authentication as a preliminary step before quantum direct communication. The authentication unit verifies the identity of communication partners using pre-shared authentication keys before message transmission begins, ensuring that only authorized parties can participate in the quantum communication protocol.
Solution Approach 2:
The patent separates the authentication function from the message transmission function. The authentication unit and message transmission unit operate independently, with authentication performed first using classical or quantum key distribution, followed by secure message transmission using quantum states. This segmentation simplifies the overall system design.
4Ease of manufacture
If single qubits are used instead of quantum entanglement states, then ease of implementation is improved, but additional authentication mechanisms are required
Solution Approach 1:
The patent merges the authentication and message transmission processes into a unified quantum direct communication protocol. The authentication unit and message transmission unit work together in sequence, with the authentication results directly enabling or disabling message transmission. This integration reduces overall system complexity compared to separate authentication and communication systems.
Data Source
AI summary
An apparatus and method for quantum direct communication using single qubits. The apparatus includes a quantum state preparation unit for preparing quantum states including a message state prepared using pairs of single qubits based on a bit of a message to be sent to a communication partner, an authentication state prepared using random qubit pairs, and a verification state prepared using random qubit pairs, a quantum state communication unit for transmitting the quantum states to the communication partner and measuring a quantum state of a message received from the communication partner, an authentication unit for authenticating, using the authentication state, the communication partner depending on whether an authentication key previously shared with the communication partner is possessed, a verification unit for verifying security of a quantum channel using the verification state, and a message restoration unit for restoring the received message using the message state.