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Continuous-wave quantum light control via engineered Rydberg-induced dephasing

Iason Tsiamis1,2,*, Oleksandr Kyriienko3, and Anders S. Sørensen4

  • *Contact author: iason.tsiamis@fu-berlin.de
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Phys. Rev. A 113, 013710 – Published 5 January, 2026

DOI: https://doi.org/10.1103/c52w-zwqq

Abstract

We analyze several implementations of all-optical single-photon transistors (SPTs) operating in the continuous-wave (cw) regime, as presented in the companion paper [Phys. Rev. A 113, L011701 (2026)]. The devices rely on ensembles of Rydberg atoms interacting via van der Waals interactions. Under electromagnetically induced transparency (EIT), a weak probe field is fully transmitted through the atomic ensemble in the absence of control photons. Exciting a collective Rydberg state with a single control photon breaks the EIT condition, thereby strongly suppressing the probe transmission. We show how collective Rydberg interactions in an atomic ensemble, confined either in an optical cavity or in free space, give rise to two distinct probe-induced dephasing mechanisms. These processes localize the control excitations, extend their lifetimes, and increase the device efficiency. We characterize the SPTs in terms of control-photon absorption probability and probe gain, supported by numerical simulations of realistic one- and three-dimensional ensembles. The proposed cw devices complement previously demonstrated SPTs and broaden the toolbox of quantum light manipulation circuitry.

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Continuous-wave all-optical single-photon transistor based on a Rydberg-atom ensemble

Iason Tsiamis, Oleksandr Kyriienko, and Anders S. Sørensen
Phys. Rev. A 113, L011701 (2026)

Article Text

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Phys. Rev. A 113, 013710– Published 5 January, 2026
  • Received 5 August 2025
  • Accepted 28 October 2025
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