Quantum Circuit Control Skip Optimization
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Solution Overview
Problem
Quantum circuit control in quantum computing requires reducing the number of control gates, as multiple qubit gates are harder to perform and have lower fidelities, necessitating efficient algorithms with fewer two-qubit gates.
Innovation Solution
The method involves selecting computation-uncomputation pairs to be skipped in quantum circuits based on optimization scores, utilizing commutation properties and Directed Acyclic Graphs (DAGs) to reduce the number of control gates, and applying quantum identities to simplify the circuit structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If quantum circuit control includes more control gates to implement complex algorithms, then the functionality and versatility of the quantum circuit is improved, but the number of two-qubit gates increases making the operations harder to perform and reducing fidelity
Solution Approach 1:
The patent extracts and removes redundant control gates from the quantum circuit by identifying computation-uncomputation pairs that can be eliminated. This extraction process reduces the number of two-qubit gates while preserving the essential functionality of the circuit, thereby improving fidelity without sacrificing versatility.
Solution Approach 2:
The patent changes the parameter of control gate inclusion by dynamically determining which computation-uncomputation pairs should be excluded based on optimization scores. This parameter change allows the circuit to maintain necessary functionality while reducing the harmful impact of excessive two-qubit gates on operation fidelity.
2Adaptability or versatility
If quantum circuit control includes more control gates to implement complex algorithms, then the functionality and versatility of the quantum circuit is improved, but the device complexity and number of elements increases
Solution Approach 1:
The patent extracts redundant control gates from the quantum circuit by identifying and removing computation-uncomputation pairs. This extraction reduces the total number of control gates and circuit elements while maintaining the necessary functionality, thereby simplifying the device complexity.
Solution Approach 2:
The patent segments the quantum circuit into identifiable computation-uncomputation pairs and evaluates each pair independently for potential exclusion. This segmentation allows for systematic reduction of control gates by analyzing and optimizing individual pairs rather than treating the entire circuit as a monolithic structure.
3Device complexity
If all computation-uncomputation pairs are excluded from quantum circuit control to reduce complexity, then the number of control gates is reduced, but the optimization cannot account for intersecting pairs and may remove necessary operations
Solution Approach 1:
The patent implements feedback by calculating optimization scores for each computation-uncomputation pair and using these scores to make informed exclusion decisions. The scoring mechanism provides feedback on the impact of excluding each pair, allowing the optimization process to distinguish between redundant and necessary operations, thereby maintaining correctness while reducing complexity.
Solution Approach 2:
The patent introduces dynamics by making the exclusion of computation-uncomputation pairs conditional rather than static. The optimization score dynamically determines which pairs to exclude based on their individual merits and interactions, allowing the circuit optimization to adaptively preserve necessary operations while removing redundant ones.
Data Source
AI summary
A method, a computerized apparatus, and a computer program product for automatic quantum circuit control skips. The method comprises obtaining a controlled sequence of quantum operations defining a complete order with at least two computation-uncomputation pairs of operations separated by a sub-sequence of one or more quantum operations. Computation-uncomputation pairs to be reduced are selected based on an optimization of a score of the reduced control sequence in comparison to a score of an alternative reduced control sequence in which the pairs are not reduced, in accordance with a score of each operation in a respective quantum circuit control. A reduced control sequence with a reduced number of controls is obtained by excluding a selected computation-uncomputation pairs of operations.