Photon Generating Apparatus with Optical Switch Buffer
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Solution Overview
Problem
Existing quantum communication technologies face security threats due to low efficiency and reliability of single-photon light sources, which are essential for preventing eavesdropping, as current methods result in high frequencies of multiple photons being emitted, compromising security.
Innovation Solution
A photon generating apparatus comprising a light source, optical medium, detector, buffer with optical switches, and processor that controls optical paths to ensure high probability of generating one photon at a required time, improving quantum mechanical purity through dispersion compensation, using spontaneous parametric down conversion or spontaneous four-wave mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photon generation efficiency is increased higher than 10%, then photon generation efficiency is improved, but the frequency of two or more photons being simultaneously emitted is increased, compromising security
Solution Approach 1:
The patent segments the photon generation process by using a weak laser pulse that is divided into multiple time slots, where only one photon is expected to be generated per slot. This temporal segmentation allows the system to maintain high overall photon generation efficiency while ensuring that only one photon is present at any given measurement time, thus preserving security.
Solution Approach 2:
The patent employs preliminary action by using a detector to detect the presence of a photon in advance before the main measurement process. The detection result is used to control the optical switch, ensuring that only photons that were previously detected are processed further, thereby preventing multiple photons from compromising security while maintaining high generation efficiency.
2Reliability
If single-photon light sources based on weak laser pulses or nonlinear optics are used, then security is maintained, but photon generating efficiency is low (10% or less)
Solution Approach 1:
The patent implements feedback by using the detection result of a photon to control the optical switch in the buffer. The processor receives the detection result and generates a control signal to switch the optical path, creating a feedback loop that ensures only properly timed photons are processed. This feedback mechanism allows the system to maintain security while significantly improving photon generation efficiency.
Solution Approach 2:
The patent applies dynamics by making the optical path configurable through optical switches that can be dynamically controlled based on detection results. The buffer's optical path changes dynamically depending on the photon detection outcome, allowing the system to adapt and optimize photon generation efficiency while maintaining security protocols.
3Reliability
If single-photon light sources based on single emitters using quantum dots or single-atom are used, then security is improved, but single-photon generation efficiency cannot be obtained sufficiently due to limit of photon collecting efficiency
Solution Approach 1:
The patent introduces an intermediary system consisting of a buffer with optical switches and delay lines between the light source and the detector. This intermediary component collects and manages photons efficiently, using temporal and spatial routing to ensure that photons are delivered to the detector at the correct time. The buffer acts as a mediator that overcomes the collecting efficiency limits of direct single-emitter systems while preserving security.
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
Enhances the probability of generating single photons at a specific time, improving quantum mechanical purity and security by compensating for temporal discrepancies in photon emission, thereby addressing the limitations of existing quantum communication technologies.
Implementation Method 1
The optical medium may perform one of spontaneous parametric down conversion and spontaneous four wave mixing.
Implementation Method 2
The optical medium may perform one of spontaneous parametric down conversion and spontaneous four wave mixing.
Data Source
AI summary
According to one embodiment of the present invention, there is provided a photon generating apparatus including: a light source configured to emit light; an optical medium configured to generate a pair of photons from the light; a detector configured to detect one photon from the pair of photons and output a detection time of the photon; a buffer including an optical line and an optical switch disposed on an optical path of the photon, which is one photon except for the photon detected by the detector, of the pair of photons; and a processor configured to output a driving signal which controls the optical switch so that a delay occurs at the optical path using the detection time of the photon detected by the detector.