Spatio-Temporal Optical Interferometer for Scalable Quantum Processing
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Solution Overview
Problem
Implementing programmable linear optical interferometers on thousands of modes is not feasible using bulk free-space optical components due to stability constraints, and spatially-encoded universal multi-port interferometers become difficult to control as the number of modes increases, hindering the scaling of boson sampling applications towards quantum supremacy.
Innovation Solution
A spatio-temporal implementation of arbitrary unitary transformations is achieved through a combination of smaller optical circuits using a triangular architecture with interconnected reconfigurable beam splitters and phase shifters, along with optical delay lines, allowing for the performance of universal transformations on multiple input optical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bulk free-space optical components are used to implement programmable linear optical interferometers on thousands of modes, then the transformation capability is improved, but stability deteriorates due to stability constraints
Solution Approach 1:
The patent transitions from purely spatial encoding to spatio-temporal encoding by introducing the temporal dimension through optical delay lines. This allows the system to implement large N-mode unitary transformations by combining smaller M-mode optical circuits across multiple time steps, achieving the transformation capability of thousands of modes without requiring all components to be stable simultaneously in space.
Solution Approach 2:
The patent decomposes a large N-mode unitary transformation into a sequence of smaller M-mode transformations applied at different time steps. Each optical circuit processes a subset of modes, and the results are combined through temporal multiplexing. This segmentation reduces the stability requirements for each individual circuit while achieving the overall large-scale transformation capability.
2Adaptability or versatility
If spatially-encoded universal multi-port interferometers are used to increase the number of modes, then the transformation scope is improved, but control complexity increases and becomes increasingly difficult to manage
Solution Approach 1:
The patent divides the control of large N-mode transformations into multiple simpler control steps, where each step controls a smaller M-mode transformation. The temporal separation allows each control operation to be simpler and more manageable, while the sequence of operations achieves the overall complex transformation. This reduces the instantaneous control complexity compared to managing all N modes simultaneously in space.
Solution Approach 2:
By introducing temporal dimension through delay lines, the patent moves control complexity from the spatial domain to the temporal domain. Instead of controlling all N spatial modes simultaneously with high complexity, the system controls M modes at a time across T time steps, where the temporal sequencing simplifies the control architecture.
3Productivity
If the number of optical modes is scaled up for boson sampling applications, then quantum supremacy capability is improved, but resource requirements and control complexity increase
Solution Approach 1:
The patent implements large N-mode boson sampling by segmenting the optical circuit into multiple smaller M-mode units that operate sequentially in time. Each unit requires fewer resources, and the temporal multiplexing allows the system to achieve equivalent functionality to a large simultaneous spatial arrangement with reduced resource requirements at any given moment.
Solution Approach 2:
The patent uses temporal multiplexing to achieve large-scale boson sampling with reduced spatial resources. By processing photons through smaller optical circuits at different time steps and using delay lines to manage temporal modes, the system achieves the computational capability of large N-mode systems without requiring proportionally large spatial footprints or simultaneous resource allocation.
Data Source
AI summary
An apparatus includes a plurality of interconnected reconfigurable beam splitters and a plurality of phase shifters collectively configured to define a network of optical devices. The network of optical devices is configured to perform a universal transformation on a plurality of input optical signals via a triangular architecture. The apparatus also includes a first delay line optically coupled to the network of optical devices and configured to send at least one output optical signal from a plurality of output optical signals of the network of optical devices to interact with at least one input optical signal in the plurality of input optical signals within the network of optical devices.