Clock Transitions Guard Against Spin Decoherence in Singlet Fission

TL;DR

This paper demonstrates how clock transitions in molecules can significantly enhance coherence times by mitigating quantum noise, with potential applications in quantum computing and sensing.

Contribution

It introduces the concept of clock transitions in molecular systems, showing their ability to reduce decoherence in singlet fission molecules through conical intersections.

Findings

Identification of clock transitions in a two-chromophore molecule.

Analysis of how Zeeman field and molecular orientation affect CTs.

Potential for improved quantum coherence in molecular systems.

Abstract

Short coherence times present a primary obstacle in quantum computing and sensing applications. In atomic systems, clock transitions (CTs), formed from avoided crossings in an applied Zeeman field, can substantially increase coherence times. We show how CTs can dampen intrinsic and extrinsic sources of quantum noise in molecules. Conical intersections between two periodic potentials form CTs in electron paramagnetic resonance experiments of the spin-polarized singlet fission photoproduct. We report on a pair of CTs for a two-chromophore molecule in terms of the Zeeman field strength, molecular orientation relative to the field, and molecular geometry.