Quantum Secure Direct Communication Receiver Complexity Reduction
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Solution Overview
Problem
Existing quantum secure direct communication (QSDC) protocols have high complexity due to the use of quantum memory and Bell state measurement methods, which increase the configuration complexity of the receiver and lead to information loss and reduced transmission distance.
Innovation Solution
A method and device for performing two-step quantum secure direct communication (QSDC) without measuring a quantum memory and a Bell state of a receiver, using a low-complexity individual single-photon detection scheme to detect entanglement signals and classical message information by comparing measurement values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If quantum memory and Bell state measurement methods are used to detect entanglement state signals, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the quantum memory component from the receiver configuration, replacing it with a simplified single-photon detection scheme. This removes the complex quantum memory subsystem while maintaining the ability to detect entanglement state signals through individual photon detection and classical communication protocols.
Solution Approach 2:
The patent replaces the mechanical quantum memory system with a classical communication-based detection method. Instead of storing quantum states in a quantum memory device, the system uses classical channels to transmit and compare measurement results, substituting a complex quantum mechanical storage system with a simpler classical information processing approach.
2Measurement precision
If quantum memory and Bell state measurement methods are used, then measurement precision is improved, but transmission distance decreases due to information loss
Solution Approach 1:
By removing the quantum memory component that causes information loss, the patent enables longer transmission distances. The simplified single-photon detection scheme without quantum memory storage eliminates the source of information degradation, allowing quantum information to be transmitted and detected over extended distances with minimal loss.
3Measurement precision
If quantum memory and Bell state measurement methods are used, then measurement precision is improved, but ease of manufacture decreases
Solution Approach 1:
The patent extracts and removes the quantum memory subsystem, significantly simplifying the receiver configuration and improving ease of manufacture. The reduced system requires only standard single-photon detectors and classical communication components, eliminating the need for complex quantum memory devices and their associated calibration and control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the complexity of the receiver configuration, minimizes information loss, and extends the transmission distance of quantum information, while maintaining the security of the quantum communication system.
Implementation Method 1
the checking sequence and a message coding sequence constitute entangled photon pairs (Einstein-Podolsky-Rosen pairs (EPR-pairs))
Implementation Method 2
performing single photon detection on the basis of first basis information with respect to a part corresponding to a randomly selected first position in the checking sequence
Data Source
AI summary
The present disclosure relates to a quantum communication system. Particularly, the present disclosure relates to a device and a method for performing two-step quantum secure direct communication (QSDC) with a reduced complexity without measuring a quantum memory and a bell state of a receiver in a quantum communication system.