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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Enhancing Initial State Overlap through Orbital Optimization for Faster Molecular Electronic Ground-State Energy

Pauline J Ollitrault¹, Cristian L Cortes¹, Jérôme F Gonthier¹

¹QC Ware Corporation, Palo Alto, California 94301, USA.

Physical Review Letters

|January 3, 2025

Summary

This summary is machine-generated.

Quantum computing phase estimation for molecular ground-state energy is improved by an orbital optimization scheme. This method significantly enhances state overlap, crucial for accurate quantum chemical calculations.

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Area of Science:

Quantum computing
Quantum chemistry
Computational physics

Background:

The phase estimation algorithm is vital for determining molecular ground-state energies on quantum computers.
Algorithm efficiency is limited by the overlap between the initial state and the system's ground state, which degrades with increasing system size.

Purpose of the Study:

To introduce a practical orbital optimization scheme to enhance the overlap for quantum phase estimation.
To improve the efficiency and accuracy of quantum algorithms for molecular electronic structure calculations.

Main Methods:

Developed and applied a novel orbital optimization strategy.
Tested the method on four iron-sulfur molecules and cytochrome P450 enzyme models.

Main Results:

Achieved up to a 2-order-of-magnitude enhancement in overlap compared to traditional localized orbitals.
Demonstrated significant overlap improvements in complex molecular systems like cytochrome P450.

Conclusions:

The proposed orbital optimization scheme effectively mitigates the overlap decay problem in quantum phase estimation.
This advancement is critical for enabling accurate and efficient quantum computation of molecular energies and properties.