Two-colour high-purity Einstein-Podolsky-Rosen photonic state

Tulio Brito Brasil (), Valeriy Novikov, Hugo Kerdoncuff, Mikael Lassen and Eugene S. Polzik ()
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Tulio Brito Brasil: Niels Bohr Institute, University of Copenhagen
Valeriy Novikov: Niels Bohr Institute, University of Copenhagen
Hugo Kerdoncuff: Danish Fundamental Metrology
Mikael Lassen: Danish Fundamental Metrology
Eugene S. Polzik: Niels Bohr Institute, University of Copenhagen

Nature Communications, 2022, vol. 13, issue 1, 1-5

Abstract: Abstract We report a high-purity Einstein-Podolsky-Rosen (EPR) state between light modes with the wavelengths separated by more than 200 nm. We demonstrate highly efficient EPR-steering between the modes with the product of conditional variances $${{{{{{{{\mathcal{E}}}}}}}}}^{2}=0.11\pm 0.01\ll 1$$ E 2 = 0.11 ± 0.01 ≪ 1 . The modes display − 7.7 ± 0.5 dB of two-mode squeezing and an overall state purity of 0.63 ± 0.16. EPR-steering is observed over five octaves of sideband frequencies from RF down to audio-band. The demonstrated combination of high state purity, strong quantum correlations, and extended frequency range enables new matter-light quantum protocols.

Date: 2022
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DOI: 10.1038/s41467-022-32495-7

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