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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Spectral compression of narrowband single photons with a resonant cavity

Mathias Alexander Seidler, Xi Jie Yeo, Alessandro Ceré, Christian Kurtsiefer

Published Jun 21, 2021• 0 citations
Publisher

Abstract

We present our work on a first experimental demonstration of spectral compression performed on heralded 795 nm single photons with narrow spectral bandwidths about 3 times larger than the corresponding atomic transitions [1] , generated through four-wave mixing in cold Rubidium-87 atoms [2] .
DOI
10.1109/cleo/europe-eqec52157.2021.9542702

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We report an experimental demonstration of spectral compression performed on heralded 795 nm single photons with narrow spectral bandwidths about 3 times larger than the corresponding atomic transitions, generated through four-wave mixing in cold Rubidium-87 atoms. This scheme uses an asymmetric cavity as a dispersion medium to spread out the photon temporally, and subsequently a phase modulator, to modify the spectral energy distribution of the photons. The spectral bandwidth of the photons was compressed by a factor of 2.6, from 20.6 MHz to less than 8 MHz, almost matching the corresponding atomic transition linewidth of 6 MHz. The spectral compression scheme can potentially be adapted to a wide range of wavelengths and spectral widths.
We experimentally demonstrate that the bandwidth of single photons laser pulse is compressed by a factor of 58 in a periodically poled lithium niobate (PPLN) waveguide chip. A positively chirped single photons laser pulse and a negatively chirped classical laser pulse are employed to produce a narrowband single photon pulse with new frequency through sum-frequency generation. In our experiment, the frequency and bandwidth of single photons at 1550 nm are simultaneously converted. Our results mark a critical step towards the realization of coherent photonic interface between quantum communication at 1550 nm and quantum memory in the near-visible window.