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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

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Single-Shot Conditional Displacement Gate between a Trapped Atom and Traveling Light.

Seigo Kikura¹, Hayato Goto^2,3, Fumiya Hanamura^4,5

¹Waseda University, Faculty of Science and Engineering, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.

Physical Review Letters

|May 29, 2026

Summary

This summary is machine-generated.

We demonstrate a single-shot conditional displacement gate using a trapped atom and a light pulse. This advances quantum information processing by linking stationary atoms with traveling light.

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Area of Science:

Quantum Information Science
Atomic Physics
Quantum Optics

Background:

Hybrid quantum systems require robust methods for interfacing stationary qubits (like trapped atoms) with itinerant qubits (like photons).
Implementing universal quantum control necessitates efficient and reliable quantum gates.

Purpose of the Study:

To propose and theoretically analyze a single-shot conditional displacement gate.
To enable coherent linking between trapped atoms and traveling light pulses for quantum information processing.

Main Methods:

Utilizing a trapped atom as a control qubit and a traveling light pulse as a target oscillator.
Employing an optical cavity to mediate the interaction.
Implementing synchronized classical driving of the atom with light reflection for single-shot operation.

Main Results:

A single-shot conditional displacement gate is proposed.
A concise gate model is derived, accounting for cavity loss and atomic decay.
The model facilitates gate performance evaluation and optimization.

Conclusions:

The proposed gate provides a practical tool for coherently connecting stationary atoms and itinerant light.
This is a crucial capability for advancing hybrid quantum information processing architectures.