English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report an experiment demonstrating quantum frequency conversion of weaklight pulses compatible with atomic quantum memories to telecommunicationwavelengths. We use a PPLN nonlinear waveguide to convert weak coherent statesat the single photon level with a duration of 30ns from a wavelength of 780nmto 1552nm. We measure a maximal waveguide internal (external) conversionefficiency eta_int = 0.41 (eta_ext = 0.25), and we show that the signal tonoise ratio (SNR) is good enough to reduce the input photon number below 1. Inaddition, we show that the noise generated by the pump beam in the crystal isproportional to the spectral bandwidth of the device, suggesting that narrowerfiltering could significantly increase the SNR. Finally, we demonstrate thatthe quantum frequency converter can operate in the quantum regime by convertinga time-bin qubit and measuring the qubit fidelity after conversion.

Quantum frequency conversion of quantum memory compatible photons to telecommunication wavelengths