Demonstration of a single-photon router in the microwave regime.
Phys Rev Lett
; 107(7): 073601, 2011 Aug 12.
Article
en En
| MEDLINE
| ID: mdl-21902392
ABSTRACT
We have embedded an artificial atom, a superconducting transmon qubit, in an open transmission line and investigated the strong scattering of incident microwave photons (â¼6 GHz). When an input coherent state, with an average photon number Nâª1 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.
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Phys Rev Lett
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2011
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Article
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