OAM Photon Source Multiplexing for High-Dimensional Quantum Communication
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Solution Overview
Problem
Existing quantum communication systems face challenges in transmitting high-dimensional information efficiently, particularly in achieving higher data rates and secure communication using orbital angular momentum encoding.
Innovation Solution
A photon source with multiple optical channels, each equipped with a light emitter and a phase mask to encode orthogonal orbital angular momentum, combined using combining optics to form a single encoded optical signal, allowing high-dimensional encoding and multiplexing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple optical channels with orthogonal orbital angular momentum encoding are used, then information transmission capacity increases, but device complexity increases
Solution Approach 1:
The system divides the optical communication channel into multiple independent optical channels (102, 104, 106, 108), each handling a specific orbital angular momentum mode. This segmentation allows parallel transmission of multiple encoded signals while maintaining manageable complexity through modular architecture with dedicated phase masks and combining optics for each channel.
Solution Approach 2:
The patent utilizes orbital angular momentum as an additional encoding dimension beyond traditional polarization encoding. By encoding information in the spatial mode structure of light (LG modes with different azimuthal indices l), the system achieves high-dimensional encoding where each photon can carry multiple bits of information, dramatically increasing information capacity without proportionally increasing device complexity.
2Productivity
If high-dimensional encoding using orbital angular momentum is implemented, then data rate increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs identical phase mask structures (103, 105, 107, 109) for each optical channel, which are copies of the same design optimized for specific orbital angular momentum modes. This standardized copying approach simplifies manufacturing by using repeated proven designs rather than custom components for each channel, reducing precision requirements while maintaining high-dimensional encoding capabilities.
Solution Approach 2:
The system achieves different orbital angular momentum encodings by varying the azimuthal index parameter (l) of the Laguerre-Gaussian modes rather than changing the physical structure of the phase masks. This parameter-based differentiation allows high-dimensional encoding with standardized hardware, reducing manufacturing precision requirements while maintaining high data rates through multiplexing multiple l values.
3Productivity
If simultaneous activation of multiple optical channels is used, then signal multiplexing efficiency increases, but control complexity increases
Solution Approach 1:
The patent merges multiple independently encoded optical channels into a single multiplexed output beam using combining optics (120). This merging approach allows simultaneous transmission of multiple orthogonal orbital angular momentum modes in one beam, achieving high multiplexing efficiency while the modular combining structure keeps control complexity manageable through standardized integration of channel outputs.
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 high-dimensional quantum information encoding with increased data rates and secure communication, utilizing compact and fast light sources like laser diodes and VCSELs, capable of producing on-demand optical pulses and entangled photons for enhanced security.
Implementation Method 1
a phase mask optically connected to the respective light emitter and configured to encode an orbital angular momentum into incident light
Data Source
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AI summary
The present invention provides a photon source for quantum communication. The photon source comprises a plurality of optical channels, each comprising: a light emitter configured to emit optical pulses, and a phase mask optically connected to the respective light emitter and configured to encode an orbital angular momentum into incident light, wherein each of the phase masks of each optical channel is configured to encode a mutually orthogonal orbital angular momentum to the optical pulses emitted by the light emitter of each optical channel to provide an encoded optical output; a controller electrically coupled to each light emitter in each optical channel and configured to control parameters of the optical pulses; and combining optics configured to combine the encoded optical output of each of the optical channels to form a single encoded optical signal. Furthermore, the present invention provides an optical quantum communication system comprising the inventive photon source. Furthermore, the present invention provides a method for quantum communication.