Shared Quantum Decoder Pipeline for Scalable Logical Qubits

Solution Overview

Problem

Current quantum error correction decoders face challenges in scalability and resource efficiency, as they require multiple dedicated decoders for each logical qubit, limiting the size and scale of quantum computing devices and incurring high resource overheads.

Innovation Solution

A 3-stage pipelined micro-architecture for a hardware implementation of the Union-Find decoder is designed, allowing resource sharing across multiple logical qubits to reduce hardware costs and enable scalable fault-tolerant quantum computation, with data compression techniques to manage memory and bandwidth requirements in a cryogenic environment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If one or more dedicated decoders are provided for each logical qubit, then error correction capability is improved, but device size and scale are limited

Engineering Contradiction:

Improveerror correction capabilityVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent implements a shared decoder architecture where a single decoder block serves multiple logical qubits through time-multiplexed operation. The decoder processes syndromes from different logical qubits sequentially, with each logical qubit having its own syndrome buffer but sharing the same decoding logic and processing resources. This universal approach allows one decoder to perform error correction for L logical qubits, reducing the total decoder count from L to 1 while maintaining full error correction capability across all qubits.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent segments the decoder functionality into modular components: syndrome buffers for each logical qubit, a shared decoding engine, and a correction output stage. This segmentation allows independent buffering of syndromes from different qubits while sharing the computationally intensive decoding operations, enabling scalable architecture where the number of buffers scales with L but the decoding resources remain constant.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If multiple dedicated decoders are provided for each logical qubit, then decoding accuracy is improved, but hardware cost increases

Engineering Contradiction:

Improvedecoding accuracyVSAvoidhardware cost

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent implements a shared decoder architecture where a single decoder block serves multiple logical qubits through time-multiplexed operation. The decoder processes syndromes from different logical qubits sequentially, with each logical qubit having its own syndrome buffer but sharing the same decoding logic and processing resources. This universal approach allows one decoder to perform error correction for L logical qubits, reducing the total decoder count from L to 1 while maintaining full error correction capability across all qubits.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent segments the decoder functionality into modular components: syndrome buffers for each logical qubit, a shared decoding engine, and a correction output stage. This segmentation allows independent buffering of syndromes from different qubits while sharing the computationally intensive decoding operations, enabling scalable architecture where the number of buffers scales with L but the decoding resources remain constant.

Inventive Principle:

Principle #1Segmentation

3Reliability

If dedicated decoders are provided for each logical qubit, then error correction performance is improved, but resource overhead increases

Engineering Contradiction:

Improveerror correction performanceVSAvoidresource overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a shared decoder architecture where a single decoder block serves multiple logical qubits through time-multiplexed operation. The decoder processes syndromes from different logical qubits sequentially, with each logical qubit having its own syndrome buffer but sharing the same decoding logic and processing resources. This universal approach allows one decoder to perform error correction for L logical qubits, reducing the total decoder count from L to 1 while maintaining full error correction capability across all qubits.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent segments the decoder functionality into modular components: syndrome buffers for each logical qubit, a shared decoding engine, and a correction output stage. This segmentation allows independent buffering of syndromes from different qubits while sharing the computationally intensive decoding operations, enabling scalable architecture where the number of buffers scales with L but the decoding resources remain constant.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12073287B2Systems for coupling decoders to quantum registers

Publication Date: 2024.08.27 MICROSOFT TECHNOLOGY LICENSING LLC

AI summary

A quantum computing device comprises at least one quantum register including l logical qubits, where l is a positive integer. The quantum computing device further includes a set of d decoder blocks coupled to the at least one quantum register, where d<2*l. In this way, the decoder blocks may share decoding requests generated by the logical qubits.