Qubit Pair Prioritization for Low-Error Ancilla State Generation
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Solution Overview
Problem
The STAR architecture, which uses phase rotation gates to reduce the number of physical qubits, suffers from incomplete error correction, necessitating a reduction in the occurrence of errors in these gates to ensure accurate computation.
Innovation Solution
A computer program determines the order of priority for qubit pairs based on error rates and generates arrangement candidates for parallel execution of ancilla state generation circuits, optimizing the placement of qubit groups to minimize errors in phase rotation gates using gate teleportation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If phase rotation gates are used in STAR architecture to reduce physical qubit count, then the number of physical qubits is reduced, but error correction becomes incomplete and error rates increase
Solution Approach 1:
The patent applies local quality by determining priority orders for different qubit pairs based on their individual accuracy information and error rates. Instead of treating all qubit pairs uniformly, the system identifies specific qubit pairs with lower error rates and prioritizes their use in gate operations, thereby locally optimizing reliability in critical positions while maintaining the reduced physical qubit count of the STAR architecture
Solution Approach 2:
The patent changes the parameter of qubit pair selection from random or uniform selection to priority-based selection according to accuracy information. By dynamically adjusting which qubit pairs are used based on their error rates and priority orders, the system improves gate operation reliability without increasing the total number of physical qubits required
2Reliability
If qubit pairs with lower error rates are prioritized for gate operations, then gate operation reliability is improved, but the complexity of determining and managing priority orders increases
Solution Approach 1:
The patent applies preliminary action by determining priority orders for all qubit pairs in advance based on their accuracy information before actual gate operations commence. The classical computer pre-calculates and stores these priority orders, allowing the quantum computer to efficiently select qubit pairs during gate operations without real-time complexity, thus improving reliability while managing computational overhead
3Productivity
If ancilla state generation circuits are executed in parallel using multiple qubit groups, then computation efficiency is improved, but the number of qubit groups required increases
Solution Approach 1:
The patent applies universality by enabling multiple qubit groups to execute the same ancilla state generation circuit simultaneously in parallel. Each qubit group is configured to perform the identical generation circuit, allowing the system to produce multiple ancilla states concurrently without requiring different circuit designs, thereby improving computation efficiency while managing qubit group requirements
Data Source
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AI summary
An information processing apparatus determines an order of priority for each of a plurality of qubit pairs, which are used in a gate operation of a two-qubit rotation gate in an ancilla state generation circuit. The information processing apparatus generates a plurality of arrangement candidates each indicating a candidate of positions of a plurality of qubit groups in a qubit device, the qubit groups being used in parallel execution of the ancilla state generation circuit. The information processing apparatus selects one arrangement candidate, based on the orders determined for first qubit pairs to be used in the gate operation of the two-qubit rotation gate in the qubit groups at the position indicated by each arrangement candidate. The information processing apparatus determines to cause the ancilla state generation circuit to execute in parallel using a first plurality of qubit groups at the positions indicated by the selected arrangement candidate.