Generation of Fully Phase-Controlled Two-Photon Entangled States.

Authors

Ian Ford, Adrien Amour, Matthias Keller

Published in

Physical review letters. Volume 137. Issue 10. Pages 103604. Sep 04, 2026.

Abstract

Control over the internal states of trapped ions makes them the ideal system to generate single and two-photon states. Coupling a single ion to an optical cavity enables efficient emission of single photons into a single spatial mode and grants control over their temporal shape, phase, and frequency. Using the long coherence time of the ion's internal states and employing a scheme to protect the coherence of the ion-cavity interaction, we demonstrate the generation of a two-photon entangled state with full control over the phase. Initially, ion-photon entanglement is generated. A second photon is subsequently generated, mapping the ion's state onto the second photon. By adjusting the drive field the phase of the entangled state can be fully controlled. We implement this scheme in the most resource efficient way by utilizing a single ^{40}Ca^{+} ion coupled to an optical cavity and demonstrate the generation of a two-photon entangled stated with full phase control with a fidelity of up to 82%.

PMID:
42759003
Bibliographic data and abstract were imported from PubMed on 19 Sep 2026.

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