Spectrally Multiplexed Single-Photon Emitter for On-Demand Frequency Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current single-photon sources are probabilistic and unreliable for producing single photons on-demand in a predefined frequency, due to their reliance on non-linear processes that result in unpredictable photon generation and low-excitation probabilities.
Innovation Solution
A system comprising a pump module, photon pair source module, detector module, and non-linear photonic element that uses spectral multiplexing to generate frequency-correlated photon pairs, allowing for the selection of a pump field based on a heralding signal to produce an output photon at a predefined frequency, thereby enhancing the reliability and rate of single-photon production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-linear processes such as SPDC or SFWM are used to generate single photons, then single-photon fidelity can be made arbitrarily high, but the probability of photon production becomes highly unpredictable and the generation rate is limited by low-excitation probability
Solution Approach 1:
The system segments the photon generation process into multiple frequency modes, where each mode can be independently controlled and heralded. By dividing the spectral bandwidth into discrete frequency bins, the system can selectively enhance photons in specific modes while maintaining overall high generation rates across all modes.
Solution Approach 2:
The system performs preliminary spectral filtering and mode selection before the final photon detection stage. By pre-characterizing the spectral modes and preparing the system to recognize specific frequency patterns, the system can rapidly identify and enhance desired photon modes without waiting for complete photon generation and detection cycles.
2Reliability
If non-linear processes are operated in the regime of low-excitation probability to maintain single-photon fidelity, then multiphoton components can be made arbitrarily small, but the time at which a single heralded photon will be produced is highly unpredictable
Solution Approach 1:
The system implements feedback mechanisms where detection of heralding photons provides real-time information about the generation status of signal photons. This feedback enables dynamic adjustment of system parameters and allows the system to predict and prepare for upcoming photon arrivals, reducing the effective uncertainty in photon production timing.
Solution Approach 2:
The system employs periodic pumping schemes where pump pulses are applied at regular intervals to the non-linear medium. This periodic action creates a predictable temporal structure to photon generation, allowing the system to anticipate photon arrival times based on the pump cycle timing while maintaining the benefits of low-excitation probability operation.
3Reliability
If a single-photon source is designed to produce photons on-demand in a particular predefined field mode, then the application requirements are met, but the constraints on the photon pair source are stringent and limit the achievable generation rate
Solution Approach 1:
The system designs the photon pair source to serve multiple frequency modes simultaneously, making it universal rather than specialized for a single mode. The non-linear medium and pump configuration are optimized to generate photon pairs across a broad spectral range, allowing the same hardware to fulfill multiple application requirements at different frequencies while maintaining high generation rates.
Solution Approach 2:
The system transitions from constraining the photon source to a single frequency mode to exploiting the spectral dimension. By allowing the source to operate across multiple frequency modes and using spectral filtering to select the desired mode, the system removes the stringent constraint on the source while maintaining the ability to produce photons in a predefined mode when needed.
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
The system enables the production of single photons at a higher rate and with greater reliability in a predefined frequency, addressing the unpredictability and low-excitation probability issues of existing technologies.
Implementation Method 1
a non-linear photonic element arranged to receive the heralded second photon and a complementary selected pump field, and to produce an output photon having the predefined frequency
Implementation Method 2
Probabilistic single-photon sources typically rely on non-linear processes such as spontaneous parametric down conversion (SPDC) or spontaneous four-wave mixing (SFWM)
Implementation Method 3
a detector module comprising one or more photon detectors, each photon detector arranged to cause the generation of a heralding signal in response to a detection of a first photon
Data Source
AI summary
A system is provided for producing an output photon having a predefined frequency. A pump module produces a plurality of pump fields at a plurality of pump frequencies. A photon pair source module generates frequency-correlated photon pairs. A detector module generates a heralding signal subsequent to detecting a first photon of a photon pair, the heralding signal indicative of a frequency of the second photon of the pair. A non-linear photonic element is arranged to (1) receive the heralded second photon and a complementary selected pump field, and (2) to produce an output photon having the predefined frequency. A pump field selector is configured to (1) receive a heralding signal and (2) select, based on the received heralding signal, a pump field of the plurality of pump fields for provision to the non-linear element. Methods, controllers and computer-readable media are also described herein.