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Demonstration of a Single-Photon Router in the Microwave Regime

Io-Chun Hoi (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Christopher Wilson (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; Göran Johansson (Institutionen för mikroteknologi och nanovetenskap, Tillämpad kvantfysik) ; T. Palomaki ; B. Peropadre ; Per Delsing (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik)
Physical Review Letters (0031-9007). Vol. 107 (2011), 7,
[Artikel, refereegranskad vetenskaplig]

We have embedded an artificial atom, a superconducting transmon qubit, in an open transmission line and investigated the strong scattering of incident microwave photons (similar to 6 GHz). 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.

Nyckelord: resonance fluorescence, transistor, molecule, circuit, optics, cavity, light, atom



Denna post skapades 2011-09-01. Senast ändrad 2017-10-03.
CPL Pubid: 145694

 

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