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arXiv · 2602.09968

Cavity Quantum Electrodynamics Ring Coupled Cluster and the Random Phase Approximation

A. Eugene DePrince III·Stephen H. Yuwono·Henk Eshuis
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Abstract

It is well known that the ground-state correlation energy from the particle-hole channel of the random phase approximation (RPA) is formally equivalent to that from a simplified coupled cluster doubles (CCD) model that includes only ring diagram contraction contributions in the residual equations [{\em J. Chem. Phys.} {\bf 129}, 231101 (2008)]. We generalize this analytic result to the cavity quantum electrodynamics (QED) case and demonstrate the numerical equivalence of QED-RPA and a QED ring-CCD model that accounts for double electron excitations, coupled single electron excitations / single photon creation, and double photon creation.

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A. Eugene DePrince III, Stephen H. Yuwono, Henk Eshuis. 2026-02-10. Cavity Quantum Electrodynamics Ring Coupled Cluster and the Random Phase Approximation. https://arxiv.org/abs/2602.09968

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