Coherent temporal filtering with a quantum pulse gate prepares heralded single photons with purity above 0.90 from a spectrally multimode parametric down-conversion source, whereas conventional intensity filtering leaves them mixed.
Super-resolving frequency measurement with mode-selective quantum memory
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abstract
High-precision optical frequency measurement underpins modern science and technology, yet conventional spectroscopic techniques struggle to resolve sub-linewidth spectral features. Here, we introduce a platform for super-resolved frequency estimation based on a mode-selective atomic Raman quantum memory implemented in warm caesium vapour. By precisely engineering the light-matter interaction, the memory coherently stores the optimal temporal mode with high fidelity and retrieves it on demand, achieving mode crosstalk as low as 0.34%. To estimate the separation between two spectral lines, we experimentally measure the mean squared error of the frequency estimate, reaching a sensitivity of 1/20 of the linewidth and a ($34\pm4$)-fold enhancement in precision over direct intensity measurements. This enhanced frequency resolution, combined with on-demand storage, retrieval, and mode-conversion capabilities, establishes a pathway toward multifunctional memory-based time-frequency sensors and their integration within quantum networks.
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2026 1verdicts
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Coherent temporal filtering of multimode parametric down-conversion using a quantum pulse gate
Coherent temporal filtering with a quantum pulse gate prepares heralded single photons with purity above 0.90 from a spectrally multimode parametric down-conversion source, whereas conventional intensity filtering leaves them mixed.