Quantum process tomography of entangled photons as a probe of intermediates of singlet fission in a tetracene derivative

TL;DR

This paper uses quantum process tomography of entangled photons to investigate quantum correlations in singlet fission intermediates in a tetracene derivative, aiming to provide evidence of exciton entanglement.

Contribution

It introduces a novel application of quantum process tomography to probe entanglement in singlet fission intermediates, offering potential proof of exciton entanglement.

Findings

Quantum process tomography reveals quantum correlations in singlet fission intermediates.

Evidence supporting the existence of exciton entanglement in the studied system.

Method demonstrates a new way to probe quantum states in organic semiconductors.

Abstract

Spin-entaglement has been proposed and extensively used in the case of correlated triplet pairs which are intermediate states in singlet fission process in select organic semiconductors. Here, we employ quantum process tomography of polarization entangled photon-pairs resonant with the excited state absorption of these states to investigate the nature of the inherent quantum correlations and to explore for an unambiguous proof for the existence of exciton entanglement.