Supercontrolled Two-Qubit Gate Decomposition for Circuit Fidelity
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Solution Overview
Problem
Conventional quantum circuit design approaches face challenges in accurately simplifying two-qubit operations due to their reliance on discrete single-qubit basis sets, leading to inaccuracies and inefficient performance.
Innovation Solution
A computer-implemented method that uses zero to multiple applications of a super controlled basis gate to expand and rewrite target two-qubit operations, analyzing instances for fidelity and rewriting the source quantum circuit into a deployed quantum circuit, allowing for efficient determination of approximate or exact expansions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional approaches use discrete single-qubit basis sets for expanding two-qubit operations, then the expansion process is simplified, but accuracy and fidelity deteriorate
Solution Approach 1:
The patent changes the basis set parameters from discrete single-qubit gates to continuous two-qubit operations. By representing two-qubit operations in a continuous parameter space rather than discrete basis sets, the method achieves both accurate representation and simplified expansion processes, resolving the contradiction between ease of manufacture and measurement precision.
2Adaptability or versatility
If universal quantum computing circuits are used for all algorithms, then versatility is improved, but performance and efficiency deteriorate due to resource limits and design constraints
Solution Approach 1:
Instead of applying a single universal circuit design to all algorithms, the patent applies local optimization by tailoring the two-qubit operation expansions to the specific requirements of each algorithm. This allows each circuit instance to be optimized for its particular task, improving performance while maintaining versatility through the general expansion framework.
3Device complexity
If two-qubit gates are simplified using conventional expansion methods, then circuit complexity is reduced, but fidelity and accuracy deteriorate due to inaccuracies in the expansion process
Solution Approach 1:
The patent incorporates fidelity analysis as a feedback mechanism in the circuit simplification process. By evaluating the fidelity of expanded circuits and using this information to guide further optimization, the method maintains high accuracy while achieving circuit simplification, resolving the contradiction between reducing complexity and preserving reliability.
Data Source
AI summary
Techniques are provided for improving quantum circuits. The technology includes approximately expanding, by a system operatively coupled to a processor, using zero to a number of applications of a super controlled basis gate, a target two-qubit operation, with the approximately expanding resulting in instances of the target two-qubit operation corresponding to the zero to the number of applications, and the target two-qubit operation is part of a source quantum circuit associated with a quantum computer. The system analyzes the instances and the super controlled basis gate, and automatically rewrites the source quantum circuit into a deployed quantum circuit based on the analyzing.