Speaker
Description
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 40Ca$^+$ 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\%.
| Academic level | PhD student |
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