Binary Iterative Clock Synchronization via Polarization Entanglement
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Solution Overview
Problem
Current clock synchronization techniques, such as the Einstein protocol and Eddington slow clock transmission, face limitations in accuracy and efficiency due to shot noise limits and requirements for bidirectional signal transmission, making them impractical for high-precision applications.
Innovation Solution
A binary iterative clock synchronization system based on polarization entanglement GHZ states, which uses unidirectional transmission and a quantum mechanical approach to adjust optical paths for precise clock synchronization, allowing for higher precision and adjustable accuracy without the need for equal signal transmission speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bidirectional signal transmission is used for clock synchronization, then synchronization can be achieved, but the accuracy is limited by shot noise and requires equal signal transmission speeds in both directions
Solution Approach 1:
The patent introduces a quantum entangled photon pair as an intermediary medium for clock synchronization. One photon is sent to Alice and the other to Bob, and their correlated detection times provide synchronization information without requiring bidirectional classical signal exchange. This eliminates the need to control equal transmission speeds in both directions while achieving high precision synchronization beyond the shot noise limit.
2Measurement precision
If Eddington slow clock transmission is used, then clock synchronization accuracy can be improved, but hardware transmission cost increases and transmission time becomes problematic
Solution Approach 1:
The patent replaces the mechanical/slow physical clock transmission method with a quantum optical method. Instead of slowly transporting a physical clock, the invention uses entangled photon pairs transmitted through optical channels, achieving high-precision synchronization instantaneously without the time loss associated with slow clock transmission.
3Ease of manufacture
If classical clock synchronization methods are used, then implementation is simple, but accuracy is limited to 10^-9 s compared to clock accuracy of 10^-18 s
Solution Approach 1:
The patent changes the fundamental parameter of signal type from classical optical/electrical signals to quantum entangled photon pairs. This parameter change enables the system to achieve synchronization accuracy at the quantum level (approaching 10^-18 s or better) while maintaining relative implementation simplicity through the use of standard quantum optical components.
4Measurement precision
If quantum clock synchronization algorithms are used, then exponential improvement in precision is achieved, but quantum computation maturity is required which is not yet available
Solution Approach 1:
The patent extracts the essential quantum resource (entangled photon pairs) from complex quantum computation protocols and uses it directly for clock synchronization without requiring full quantum computing infrastructure. This simplifies the requirements to only what is necessary for generating and detecting entangled photons, making the system compatible with current technological capabilities.
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 method achieves high-precision clock synchronization with reduced limitations from optical fiber instability and allows for iterative adjustments to meet specific precision requirements, optimizing precision and efficiency.
Implementation Method 1
an emitting party C, configured to prepare a three-photon polarization entangled GHZ state and to measure one-photon polarization state among the three-photon polarization entangled GHZ states
Implementation Method 2
an optical delay line (ODL), configured to adjust an optical delay of the L1 so as to balance two arms of the L1 and the L2
Implementation Method 3
a first polaroid, configured to distinguish a Z-based polarization state of photons; a second polaroid, configured to distinguish an X-based polarization state of photons
Data Source
AI summary
The disclosure provides a binary iterative clock synchronization system based on polarization entanglement GHZ state comprising a first synchronization party, a second synchronization party and an emitting party; the first synchronization party is connected with the second synchronization party through a classical channel, the emitting party is connected with the first synchronization party through a quantum channel, and the emitting party is connected with the second synchronization party through a quantum channel and a classical channel; the emitting party realizes the preparation of three-photon polarization entangled GHZ states and measures one of the photon polarization states; the first synchronization party and the second synchronization party perform measurement on the polarization states of the other two photons, and the second synchronization party and the emitting party compare the measurement results to obtain the measurement sequence information between the first synchronization party and the second synchronization party.