VQE Quantum Circuit Depth Reduction via Layer Segmentation
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Solution Overview
Problem
The high circuit depth of quantum circuits used in variational quantum eigensolvers (VQE) for quantum chemical calculations leads to increased calculation time and error accumulation, making it difficult to complete calculations within the coherence time and obtain accurate results.
Innovation Solution
The approach involves generating a quantum circuit by integrating partial circuits from a second quantum circuit into a first quantum circuit, adjusting rotation angles, and deleting partial circuits to reduce circuit depth, thereby reducing the number of gate operations and minimizing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard quantum circuit for VQE is used to perform quantum chemical calculation, then the calculation can be executed, but the circuit depth becomes excessively large leading to increased calculation time and error accumulation
Solution Approach 1:
The quantum circuit is divided into multiple layers, with each layer containing specific quantum operations. By segmenting the circuit in this manner, the patent enables selective deletion of entire layers that contribute less to calculation accuracy, thereby reducing overall circuit depth while maintaining essential computational functionality.
Solution Approach 2:
The patent applies partial action by selectively removing certain layers from the quantum circuit rather than executing the complete standard circuit. By identifying and deleting redundant or less critical layers, the method achieves sufficient calculation accuracy with reduced circuit depth, avoiding the need to execute all original circuit components.
2Productivity
If the circuit depth is reduced by deleting quantum operations, then calculation time decreases, but calculation accuracy may be compromised
Solution Approach 1:
The circuit is segmented into layered structures where each layer's contribution to accuracy can be evaluated independently. This segmentation allows systematic removal of less critical layers while preserving those that provide the most value, achieving a balanced reduction in circuit depth without proportionally sacrificing accuracy.
Solution Approach 2:
The patent changes the parameter of circuit depth by selectively deleting layers, optimizing the balance between calculation speed and accuracy. By adjusting which layers to remove and how many to keep, the method dynamically optimizes the circuit configuration for specific calculation requirements.
Data Source
AI summary
A non-transitory computer-readable recording medium stores an information processing program for causing a computer to execute processing including: acquiring a quantum circuit to perform quantum chemical calculation by a variational quantum eigensolver, which includes a first quantum circuit to create a wave function that expresses an electron orbit of a molecule to be calculated and a second quantum circuit to transform a base of the wave function; changing a first rotation angle applied to a rotation operation in the first quantum circuit according to a second rotation angle applied to a partial circuit that indicates a rotation operation in the second quantum circuit; and deleting the partial circuit from the quantum circuit.