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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

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Photon-Interfaced Ten-Qubit Register of Trapped Ions.

M Canteri¹, Z X Koong¹, J Bate¹

¹Universität Innsbruck, Institut für Experimentalphysik, Technikerstrasse 25, 6020 Innsbruck, Austria.

Physical Review Letters

|September 10, 2025

Summary

Researchers developed a method to entangle individual ion qubits with photons, creating photonic qubits for scalable quantum networks. This breakthrough advances quantum computing and communication technologies.

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Area of Science:

Quantum Information Science
Atomic, Molecular, and Optical Physics

Background:

Scalable quantum computing necessitates efficient interfaces between quantum processors and photons.
Developing reliable methods for entangling matter qubits with photonic qubits is crucial for quantum networks.

Purpose of the Study:

To demonstrate a technique for entangling individual matter qubits within a register with separate traveling photons.
To establish an efficient interface between multiqubit registers and photonic qubits.

Main Methods:

Utilizing a string of ten co-trapped atomic ions as matter qubits.
Employing a laser-driven cavity-mediated Raman transition to couple ion qubits to an optical cavity.
Sequentially bringing ions into the optical cavity to emit entangled photons via controlled trap confinement.

Main Results:

Successfully generated a train of photonic qubits, each entangled with a distinct ion qubit.
Achieved an average ion-photon Bell state fidelity of 92%.
Obtained an average single-photon detection probability of 9%.

Conclusions:

The demonstrated technique is scalable to larger ion-qubit registers.
This method paves the way for entangling distributed networks of trapped-ion quantum processors.
Enables near-term applications in quantum sensing and synchronized atomic clocks.