Neutral-Atom Wavelength-Compatible 780 nm Single Photons from a Trapped Ion via Quantum Frequency Conversion
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-01-23 |
| Journal | Physical Review Applied |
| Authors | James Siverns, John Hannegan, Qudsia Quraishi |
| Institutions | DEVCOM Army Research Laboratory, Joint Quantum Institute |
| Citations | 25 |
Abstract
Section titled āAbstractāQuantum networks consisting of quantum memories and photonic interconnects\ncan be used for entanglement distribution (L.-M.Duan and H. J. Kimble, PRL 90,\n253601 (2003), H. J. Kimble, Nat. 453, 1023 EP (2008)), quantum teleportation\n(S.Pirandola et.al, Nat. Photon. 9, 641 (2015)), and distributed quantum\ncomputing (T.Spiller, et.al., New J. Phys. 8, 30 (2006). Remotely connected\ntwo-node networks have been demonstrated using memories of the same type:\ntrapped ion systems (D.Hucul, et.al, Nat. Phys. 11, 37 (2014)), quantum dots\n(W. B. Gao et. al, Nat. Photon. 9, 363 (2015)), and nitrogen vacancy centers\n(W. B. Gao et. al, Nat. Photon. 9, 363 (2015), B. Hensen, et. al., Nat. 526,\n682 (2015)). Hybrid systems constrained by the need to use photons with the\nnative emission wavelength of the memory, have been demonstrated between a\ntrapped ion and quantum dot (H.Meyer et.al PRL 114, 123001 (2015)) and between\na single neutral atom and a Bose-Einstein Condensate (M.Lettner et. al, PRL\n106, 210503 (2011)). Most quantum systems operate at disparate and incompatible\nwavelengths to each other so such two-node systems have never been\ndemonstrated. Here, we use a trapped 138Ba$^{+}$ ion and a periodically poled\nlithium niobate (PPLN) waveguide, with a fiber coupled output, to demonstrate\n19% end-to-end efficient quantum frequency conversion (QFC) of single photons\nfrom 493 nm to 780 nm. At the optimal signal-to-noise operational parameter, we\nuse fluorescence of the ion to produce light resonant with the $^{87}$Rb $D_2$\ntransition. To demonstrate the quantum nature of both the unconverted 493 nm\nphotons and the converted photons near 780 nm, we observe strong quantum\nstatics in their respective second order intensity correlations. This work\nextends the range of intra-lab networking between ions and networking and\ncommunication between disparate quantum memories. A\n