Quantum frequency conversion with ultra-broadband tuning in a Raman memory | Zendy

Philip J. Bustard | Zendy; Duncan England | Zendy; Khabat Heshami | Zendy; Connor Kupchak | Zendy; Benjamin J. Sussman | Zendy

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Quantum frequency conversion with ultra-broadband tuning in a Raman memory

Author(s) -

Philip J. Bustard,

Duncan England,

Khabat Heshami,

Connor Kupchak,

Benjamin J. Sussman

Publication year - 2017

Publication title -

physical review. a/physical review, a

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.391

H-Index - 283

eISSN - 2469-9934

pISSN - 2469-9926

DOI - 10.1103/physreva.95.053816

Subject(s) - photon , photonics , raman spectroscopy , optoelectronics , physics , materials science , quantum , quantum efficiency , spontaneous parametric down conversion , quantum network , frequency comb , optics , quantum information , laser , quantum mechanics , quantum entanglement

Quantum frequency conversion is a powerful tool for the construction of hybrid quantum photonic technologies. Raman quantum memories are a promising method of conversion due to their broad bandwidths. Here we demonstrate frequency conversion of THz-bandwidth, fs-duration photons at the single-photon level using a Raman quantum memory based on the rotational levels of hydrogen molecules. We shift photons from 765 nm to wavelengths spanning from 673 to 590 nm\u2014an absolute shift of up to 116 THz. We measure total conversion efficiencies of up to 10% and a maximum signal-to-noise ratio of 4.0(1):1, giving an expected conditional fidelity of 0.75, which exceeds the classical threshold of 2/3. Thermal noise could be eliminated by cooling with liquid nitrogen, giving noiseless conversion with wide tunability in the visible and infrared.Peer reviewed: YesNRC publication: Ye

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