Quantum Signal Transmission via Time-Slot Multiplexing
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Solution Overview
Problem
Existing quantum key distribution (QKD) systems face challenges in transmitting quantum keys and public data over the same optical fiber due to differing power requirements, leading to interference and reduced security, as classical encryption techniques are vulnerable to interception and decryption.
Innovation Solution
A system and method that utilize a single optical fiber for transmitting quantum signals, timing signals, and public data by implementing a controller to manage a predefined timing sequence, allowing for concurrent transmission of quantum signals and timing signals while public data is transmitted during separate timing slots, using wavelength division multiplexing to combine these channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single optical fiber is used for both quantum key distribution and public data transmission, then device complexity and fiber usage are reduced, but interference occurs due to differing power requirements causing Raman and Rayleigh scattering
Solution Approach 1:
The optical fiber transmission is segmented into distinct time slots: quantum key distribution occurs during first time slots with reduced power, while public data transmission occurs during second time slots with higher power. This temporal segmentation allows both functions to share the same fiber without mutual interference from scattering effects.
Solution Approach 2:
The system implements periodic alternation between quantum key distribution mode and public data transmission mode. The controller periodically switches the optical fiber between low-power quantum signal transmission and high-power classical data transmission, creating a rhythmic pattern that prevents continuous interference while maximizing fiber utilization.
2Reliability
If power is reduced for quantum signal transmission, then single photon pulse transmission is enabled, but public data transmission requires large amounts of power causing scattering
Solution Approach 1:
The optical fiber power level is dynamically adjusted based on the transmission mode. The controller actively switches between high power for public data transmission and low power for quantum key distribution, making the power consumption adaptive rather than static. This dynamic control allows the system to optimize power usage for each specific transmission requirement.
Solution Approach 2:
Power is applied periodically in alternating cycles: high power during public data transmission intervals, then reduced to low power during quantum key distribution intervals. This periodic power modulation enables both high-power and low-power operations using the same fiber infrastructure without continuous scattering interference.
3Ease of operation
If classical encryption is used for secure transmission, then data can be transmitted over public networks, but security is vulnerable to interception and decryption by third parties
Solution Approach 1:
The system merges quantum key distribution with classical public data transmission over the same optical fiber infrastructure. By combining both functions in a unified system with temporal multiplexing, the invention enables secure quantum-encrypted communication while maintaining ease of operation through shared hardware resources.
Solution Approach 2:
The system changes the power parameter of the optical fiber to enable different transmission modes. By adjusting power levels, the same fiber can support both quantum-level low-power secure key distribution and high-power classical data transmission, with security enforced through quantum mechanical principles during the appropriate time slots.
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
Enables secure, efficient transmission of quantum keys and public data over a single optical fiber, reducing power requirements for public data transmission during quantum signal transmission, thereby minimizing interference and enhancing security.
Implementation Method 1
transmitting quantum signals, timing signals, and public data over a single optical fiber
Implementation Method 2
using wavelength division multiplexing to combine these channels
Data Source
AI summary
A system and method for providing two-way communication of quantum signals, timing signals, and public data is provided. Generally, the system contains a first public data transceiver capable of transmitting and receiving public data in accordance with a predefined timing sequence, a first optical modulator/demodulator capable of transmitting and receiving timing signals in accordance with the predefined timing sequence, a first quantum transceiver capable of transmitting and receiving quantum signals in accordance with the predefined timing sequence, and a first controller connected to the first public data transceiver, the first optical modulator/demodulator, and the first quantum transceiver. The first controller is capable of controlling the transmission of the public data, the timing signals, and the quantum signals in accordance with the predefined timing sequence.