Demonstration of a single-photon router in the microwave regime

Io Chun Hoi*, C. M. Wilson, Göran Johansson, Tauno Palomaki, Borja Peropadre, Per Delsing

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We have embedded an artificial atom, a superconducting transmon qubit, in an open transmission line and investigated the strong scattering of incident microwave photons (∼6GHz). When an input coherent state, with an average photon number N 1 is on resonance with the artificial atom, we observe extinction of up to 99.6% in the forward propagating field. We use two-tone spectroscopy to study scattering from excited states and we observe electromagnetically induced transparency (EIT). We then use EIT to make a single-photon router, where we can control to what output port an incoming signal is delivered. The maximum on-off ratio is around 99% with a rise and fall time on the order of nanoseconds, consistent with theoretical expectations. The router can easily be extended to have multiple output ports and it can be viewed as a rudimentary quantum node, an important step towards building quantum information networks.

Original languageEnglish
Article number073601
JournalPhysical Review Letters
Issue number7
StatePublished - 9 Aug 2011
Externally publishedYes


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