Hybrid Classical-Quantum Communication Link
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Solution Overview
Problem
Current communication systems separate classical and quantum data transfer, limiting the efficiency and security of information exchange, as they do not utilize a common link for both high-speed classical and secure quantum data transmission.
Innovation Solution
A hybrid classical-quantum communication method and system that transmits both classical and quantum data over the same communication medium using non-separable modes, where the classical and quantum mode sets share common degrees of freedom such as spatial mode and polarization, enabling simultaneous data transfer and real-time error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate communication links are used for classical and quantum data transfer, then each link can be optimized for its specific function, but the overall system complexity increases and resource utilization decreases
Solution Approach 1:
The patent merges classical and quantum communication into a single hybrid communication link, allowing both types of data to be transmitted simultaneously over the same optical fiber. This is achieved by using different modulation schemes and detection methods for classical and quantum signals, thereby reducing system complexity while maintaining reliability
Solution Approach 2:
The communication system is designed to perform multiple functions through a single link: it can transmit both classical data signals and quantum key distribution signals simultaneously. The system uses universal optical components that support both classical modulation/demodulation and quantum state preparation/detection, making the system more versatile and efficient
2Speed
If high-speed classical transmission is implemented using temporal encoding, then data transfer speed increases to gigabits range, but security against eavesdroppers cannot be ensured
Solution Approach 1:
The patent combines high-speed classical transmission capabilities with quantum security by implementing a hybrid system where classical data can be transmitted at gigabit speeds using temporal encoding, while quantum key distribution provides unconditional security through the same link. The quantum channel detects eavesdropping attempts while the classical channel maintains high data transfer rates
3Reliability
If quantum key distribution is used to ensure unconditional security, then security is improved, but the key generation rate becomes very low
Solution Approach 1:
The hybrid communication link serves dual purposes: it enables quantum key distribution for secure key generation and simultaneously supports classical high-speed data transmission. This multi-functionality allows the system to achieve both high security and improved key generation rates by utilizing the same infrastructure for both quantum and classical operations
4Productivity
If spatial modes of light are used for spatial multiplexing, then data transfer capacity increases, but the system becomes more complex requiring precise mode control
Solution Approach 1:
The patent combines spatial multiplexing capabilities with hybrid classical-quantum communication by using the same spatial modes for both classical data transmission and quantum key distribution. This approach increases overall data transfer capacity while avoiding the need for separate mode control systems, as the spatial mode management is unified across both communication types
Data Source
AI summary
This invention relates generally to a method and system for hybrid classical-quantum communication. The method comprises transmitting a single photon having a particular quantum state over a communication medium using a quantum mode set; and transmitting a classical light beam over the same communication medium using a classical mode set, wherein the classical and quantum mode sets comprise non-separable modes in common. The non-separable modes in common may be two degrees of freedom of a single photon or classical light and may thus be spatial modes in one or more indexes, and polarisation. The invention relates also to a system to implement the method accordingly.