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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

Correlating the antisymmetrized geminal power wave function.

Thomas M Henderson¹, Gustavo E Scuseria¹

¹Department of Chemistry, Rice University, Houston, Texas 77005-1892, USA.

The Journal of Chemical Physics

|September 3, 2020

Summary

This summary is machine-generated.

The antisymmetrized geminal power (AGP) offers a simple model for superconductivity correlations. This study explores using AGP as a reference for advanced quantum correlation methods.

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Area of Science:

Quantum chemistry
Condensed matter physics

Background:

Superconductivity arises from strong pairing correlations, leading to off-diagonal long-range order in the two-particle density matrix.
The antisymmetrized geminal power (AGP) wave function is a foundational model for qualitatively describing these correlations while preserving number symmetry.

Purpose of the Study:

To investigate the utility of the AGP wave function as a reference state.
To explore advanced quantum correlation techniques building upon the AGP.

Main Methods:

Utilizing the antisymmetrized geminal power (AGP) as a reference state.
Considering advanced correlation techniques: configuration interaction, coupled cluster theory, and random phase approximation.

Main Results:

The AGP wave function, while simple, has limitations in quantitative accuracy across all correlation regimes.
The AGP can serve as a valuable starting point for more sophisticated theoretical treatments of electron correlation.

Conclusions:

The AGP wave function provides a qualitative yet limited description of pairing correlations.
Employing the AGP as a reference state enables the application of advanced methods for quantitatively accurate correlation descriptions.