All-optical routing of single photons by a one-atom switch controlled by a single photon

Itay Shomroni, Serge Rosenblum, Yulia Lovsky, Orel Bechler, Gabriel Guendelman, Barak Dayan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

358 Scopus citations


The prospect of quantum networks, in which quantum information is carried by single photons in photonic circuits, has long been the driving force behind the effort to achieve all-optical routing of single photons.We realized a single-photon-activated switch capable of routing a photon from any of its two inputs to any of its two outputs. Our device is based on a single atom coupled to a fiber-coupled, chip-based microresonator. A single reflected control photon toggles the switch from high reflection (R ∼ 65%) to high transmission (T ∼ 90%), with an average of ∼1.5 control photons per switching event (∼3, including linear losses). No additional control fields are required.The control and target photons are both in-fiber and practically identical, making this scheme compatible with scalable architectures for quantum information processing.

Original languageAmerican English
Pages (from-to)903-906
Number of pages4
Issue number6199
StatePublished - 22 Aug 2014
Externally publishedYes


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