Single-Wavelength Quantum State and Time Information Transmission
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Solution Overview
Problem
Current methods for transporting time information and quantum states over optical mediums require multiple optical channels, leading to high operational costs and inefficiencies, particularly in applications like quantum key distribution systems.
Innovation Solution
A system and method that utilize a single optical channel for transmitting time information and quantum states by synchronizing phase and frequency using a first and second time-synchronization unit, which compares timing information and determines time drift to minimize errors and optimize transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple optical channels are used to transmit time information and quantum states, then transmission reliability is improved, but operational cost and system complexity increase
Solution Approach 1:
The patent combines time information and quantum state transmission into a single optical channel by multiplexing them in the time domain. Time information is transmitted during specific time slots while quantum states are transmitted during other time slots, allowing both types of information to share the same physical medium without interference, thus reducing system complexity while maintaining transmission reliability
Solution Approach 2:
The single optical channel is designed to perform multiple functions: transmitting both time synchronization information and quantum states. This multi-functional approach eliminates the need for separate dedicated channels for each type of information, reducing operational costs and system complexity while maintaining the reliability required for quantum key distribution applications
2Reliability
If multiple optical channels are used to transmit time information and quantum states, then transmission reliability is improved, but operational cost increases
Solution Approach 1:
The patent merges time information and quantum state transmission into a single optical channel using time-division multiplexing. This consolidation reduces the number of required optical channels from multiple to one, directly lowering operational costs associated with maintaining and managing multiple separate transmission media while preserving the reliability needed for secure quantum communication
3Loss of energy
If a single optical channel is used to transmit time information and quantum states, then operational cost is reduced, but transmission accuracy deteriorates due to time drift
Solution Approach 1:
The patent implements a feedback mechanism where the receiver detects time drift between transmitted time information and received quantum states, then sends correction signals back to the transmitter. This feedback loop enables real-time compensation for timing inaccuracies, maintaining transmission accuracy despite using a single optical channel and reducing operational costs
Solution Approach 2:
The patent incorporates preliminary time synchronization before quantum state transmission begins. Time information is transmitted and synchronized in advance, establishing a reference timing framework that enables accurate interpretation of subsequent quantum state transmissions, thereby maintaining transmission accuracy while using cost-effective single channel operation
4Loss of energy
If a single optical channel is used to transmit time information and quantum states, then operational cost is reduced, but device complexity increases due to synchronization requirements
Solution Approach 1:
The patent uses periodic time slot allocation where time information and quantum states are transmitted in alternating, regular intervals. This periodic structure simplifies the synchronization process by creating predictable, repeating patterns that are easier to track and manage compared to asynchronous or irregular transmission schemes, thereby reducing synchronization complexity while maintaining cost-effectiveness
Data Source
AI summary
A method for transmitting time information and quantum states on an optical medium is disclosed. The method includes transmitting information comprising a timing information and quantum states over a single wavelength on an optical medium. The method also includes receiving each transmitted information sequentially in the corresponding plurality of time slots at a receiver. The method also includes comparing each timing information received in the corresponding plurality of timeslots with timing information of a preceding hold over time slot of the plurality of time slots. The method also includes determining a time drift encountered at the receiver based on a compared result. The method also includes synchronising phase and frequency of the plurality of transmitted packets of the information based on minimization of determined time drift.