Quantum Signal Generation Unit for Mobile Commerce Security
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Solution Overview
Problem
The high cost and complexity of devices required for quantum cryptography limit its accessibility and adoption in general user terminals, particularly for mobile commerce, due to the need for sensitive and expensive single photon detectors and the difficulty in miniaturizing quantum cryptography receivers.
Innovation Solution
A communication device and server system utilizing a quantum signal generation unit, optical transmission unit, and processor to generate and share secret keys via polarization or phase-controlled optical signals, enabling user authentication with reduced costs and smaller form factors, using a quantum key distribution method over optical fibers or free-space optical communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum cryptography systems use single photon detectors for secure communication, then security is improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive single photon detectors with standard photodetectors that can operate with attenuated laser beams. This substitution uses readily available, low-cost components while maintaining the quantum cryptographic function through proper signal attenuation and detection protocols
Solution Approach 2:
The system changes the operational parameters by using attenuated laser beams instead of single photons, and by operating standard photodetectors in a regime where they can detect the attenuated signals. This parameter change allows the use of conventional, inexpensive components while preserving security through the quantum key distribution protocol
2Measurement precision
If quantum cryptography receivers are designed for high sensitivity, then detection precision is improved, but device size increases making miniaturization difficult
Solution Approach 1:
The patent uses standard, commercially available photodetectors instead of specialized single photon detectors, enabling the receiver to be miniaturized and integrated into mobile devices while maintaining sufficient detection capability through proper signal attenuation
Solution Approach 2:
The system transitions from detecting individual photons to detecting attenuated laser beams, changing the detection dimension from quantum-level single particle detection to classical-level beam detection, which enables miniaturization using standard photodetector technology
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 cost and size of quantum cryptography systems, making them more accessible for mobile commerce while maintaining high security through the generation and sharing of secret keys, thereby enhancing the security of mobile payment applications.
Implementation Method 1
generate a series of first quantum signals by using a first quantum filter... select the first quantum filter based on a series of randomly generated first quantum states
Implementation Method 2
generate and share secret keys via polarization or phase-controlled optical signals
Implementation Method 3
using a quantum key distribution method over optical fibers or free-space optical communication
Implementation Method 4
using a quantum key distribution method over optical fibers or free-space optical communication
Implementation Method 5
a single photon is detected by a single photon detector
Data Source
AI summary
Disclosed herein are technologies regarding a communication device and server which are capable of cryptographic communication based on quantum cryptography. The communication device includes: a quantum signal generation unit configured to generate a series of first quantum signals by using a first quantum filter; an optical transmission unit configured to send the series of first quantum signals to a server; and a processor configured to select the first quantum filter based on a series of randomly generated first quantum states, and to control the quantum signal generation unit to generate the series of first quantum signals by using the first quantum filter.