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Conference on Lasers and Electro-Optics

Spectral Compression of Narrowband Single Photons with a Near Resonant Cavity

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

Published Jan 1, 2019• 0 citations
Publisher

Abstract

We compress the spectrum of narrowband heralded single photons generated by four-wave mixing in cold 87Rb atoms using a near-resonant cavity as dispersion medium, without reducing the brightness and almost matching the atomic linewidth.
DOI
10.1364/cleo_qels.2019.fm2a.3

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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.
Efficiently generating photon pairs with high heralding efficiency and high single photon purity that are bandwidth matched to quantum emitters, quantum memories, and other matter-based qubits is critical for quantum networking applications. However, nonlinear optics-based sources require substantial spectral engineering to overcome the orders of magnitude bandwidth mismatch between those sources and qubit systems. A popular solution is cavity-enhanced spontaneous parametric down conversion (SPDC) where the cavity sets the photon bandwidth and simultaneously enhances the spectral brightness of the SPDC. Bulk, free-space configurations are generally required to achieve the MHz-scale bandwidths required to interface with most qubit systems. Replicating these in scalable integrated photonic architectures is an ongoing challenge due to the much higher propagation losses that limit the size and linewidth of chip-based resonators. We show here how an intra-cavity slow light medium, acting as an ultra-narrow filter, would enable narrowband photon pair generation in broadband cavities with high single photon purity and without compromising the heralding efficiency. We show that such metrics can be readily realized in erbium doped thin-film lithium niobate microrings using realistic design parameters.