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  • Open Access

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

Seigo Kikura1,*, Hayato Goto2,3, Fumiya Hanamura4,5, and Takao Aoki1,2

  • *Contact author: seigokikura00@gmail.com
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Phys. Rev. Lett. 136, 190801 – Published 12 May, 2026

DOI: https://doi.org/10.1103/234l-q12q

Abstract

We propose a single-shot conditional displacement gate between a trapped atom as the control qubit and a traveling light pulse as the target oscillator, mediated by an optical cavity. Classical driving of the atom synchronized with the light reflection off the cavity realizes the single-shot implementation of the crucial gate for the universal control of hybrid systems. We further derive a concise gate model incorporating cavity loss and atomic decay, facilitating the evaluation and optimization of the gate performance. This proposal establishes a key practical tool for coherently linking stationary atoms with itinerant light, a capability essential for realizing hybrid quantum information processing.

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Phys. Rev. Lett. 136, 190801– Published 12 May, 2026
  • Received 16 October 2025
  • Revised 19 January 2026
  • Accepted 17 April 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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