Photon Source with OAM Multiplexing for High-Dimensional Quantum Links
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Solution Overview
Problem
Existing quantum communication systems face limitations in transmitting high-dimensional information efficiently, particularly in encoding schemes that rely on polarization, which hinders data rate improvements.
Innovation Solution
A photon source utilizing multiple optical channels with phase masks to encode orthogonal orbital angular momentum, enabling high-dimensional encoding and multiplexing, combined with a controller for precise control of optical pulses and emission probabilities, using emitters like laser diodes and quantum dots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polarization encoding is used in quantum communication systems, then the system can encode information into single photons, but the data rate is limited and cannot achieve high-dimensional encoding
Solution Approach 1:
The patent transitions from polarization encoding (2D) to orbital angular momentum encoding (infinite dimensions). Each optical channel uses a phase mask to encode photons with different orbital angular momentum values, enabling high-dimensional encoding. Multiple optical channels with orthogonal orbital angular momentum states further expand the encoding capacity, allowing simultaneous transmission of multiple high-dimensional quantum states.
2Adaptability or versatility
If multiple optical channels with orthogonal orbital angular momentum are used, then high-dimensional encoding is achieved, but the device complexity increases
Solution Approach 1:
The system divides the encoding task into multiple independent optical channels, each handling a specific orbital angular momentum state. Each channel contains a light emitter and a dedicated phase mask configured for that specific state. This segmentation allows parallel processing of multiple quantum states while maintaining independence and control over each channel.
Solution Approach 2:
The patent employs a universal phase mask design that can encode different orbital angular momentum states by adjusting the mask configuration. The same basic structure (light emitter + phase mask + combining optics) serves multiple functions across different optical channels, reducing the need for entirely separate systems for each encoding dimension.
3Productivity
If simultaneous activation of multiple optical channels is used for multiplexing, then data rate increases, but the difficulty of detecting and measuring encoded photons increases
Solution Approach 1:
The patent uses orthogonal orbital angular momentum states as distinguishing dimensions for multiplexed channels. Each channel's photons carry a unique orbital angular momentum signature that allows receivers to differentiate and detect photons from specific channels even when multiple channels are activated simultaneously. This orthogonal encoding in angular momentum space enables clear separation and measurement without interference.
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-speed, high-dimensional quantum communication with improved security and data rates, supporting qudits encoding and multiplexing, while being compact and resistant to eavesdropping attacks.
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
AI summary
A photon source for quantum communication including 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.