Optical Receiver for Coherent State Discrimination
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Solution Overview
Problem
Existing technologies face challenges in optimally distinguishing between multiple coherent states of light, as conventional optical detection schemes exceed the fundamental Helstrom limit, and existing receivers are limited to binary cases, failing to achieve the minimum probability of error for larger sets of coherent states.
Innovation Solution
A method and device that split coherent light into multiple identical slices of lower intensity, compressing the information content into a quantum computer's memory for further processing, allowing optimal discrimination and reuse across various quantum applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical detection schemes are used, then device complexity is reduced, but measurement precision deteriorates as error rates exceed the fundamental Helstrom limit
Solution Approach 1:
The patent segments the coherent state discrimination problem by dividing the set of M coherent states into pairs and processing them sequentially through multiple measurement rounds. Each round handles a subset of states, reducing the complexity of individual measurement operations while achieving optimal discrimination across all states through iterative processing.
Solution Approach 2:
The patent implements feedback mechanisms where measurement outcomes from previous rounds inform subsequent measurement strategies. The receiver adapts its measurement basis and processing operations based on accumulated information, enabling optimal discrimination while managing complexity through intelligent control rather than requiring complex parallel architectures.
2Measurement precision
If a receiver design achieving Helstrom limit is proposed for binary case, then measurement precision is improved, but device complexity increases and cannot be generalized to larger sets
Solution Approach 1:
The patent designs a universal receiver architecture that can handle any number of coherent states M ≥ 2 through a unified measurement and processing framework. The same basic operations (state preparation, measurement, and classical processing) are generalized to work for arbitrary sets of coherent states, eliminating the need for separate receiver designs for binary and multi-state cases.
Solution Approach 2:
The patent employs dynamic measurement strategies where the receiver adapts its measurement basis and processing operations based on the specific set of coherent states being discriminated. The measurement protocol can be adjusted in real-time based on the input states, enabling optimal performance across different M values without requiring fixed complex hardware configurations.
3Measurement precision
If classical decision is made in Dolinar receiver, then measurement precision is optimized, but loss of information increases as quantum states cannot be further processed
Solution Approach 1:
The patent introduces quantum memory as an intermediary that preserves quantum states between measurement and final processing stages. Rather than immediately making classical decisions that destroy quantum information, the system stores quantum states in memory, allowing subsequent quantum processing operations to extract additional information or perform error correction without losing the original quantum state details.
Solution Approach 2:
The patent performs preliminary quantum processing operations on the coherent states before final measurement and decision-making. By preparing and processing quantum states in advance through quantum memory and processing units, the system extracts useful information while preserving the ability to perform additional processing, avoiding the information loss that would occur with immediate classical decision-making.
Data Source
AI summary
A method and device for optimal processing of a plurality of sets of coherent states of lights. The method includes: receiving a light having a coherent state; splitting the coherent state into a plurality of identical states (slices), each a coherent state with lower intensity than that of the received coherent state; transferring the information of each of the identical coherent states into a qubit; compressing the quantum information of the qubit into a quantum memory; and quantum processing the quantum information from the quantum memory.