We experimentally demonstrate efficient reduction of heralded telecom single-photon spectral bandwidth by a factor exceeding 220, from 130 GHz to below 550 MHz. The transformation is achieved in an all-fiber setup using dispersive stretching and complex electro-optic phase modulation. The approach is deterministic and results in a 27-fold increase in photon detection probability at the target wavelength. Combined with system transmission of 40% the interface enables increasing the single-photon flux into a spectrally narrowband absorber by a factor of 11. Our approach may enable efficient interfacing matter-based quantum systems with high-rate quantum communication channels and pulsed entangled photon pair sources.
We experimentally demonstrate spectral manipulation of heralded single photons by electro-optic temporal phase modulation employing complex, Fresnel-like wide-band electronic waveforms. We show spectral compression of classical telecom light enhancing its maximal intensity by over 80, by compressing its full-width at half maximum (FWHM) bandwidth from 0.856 nm down to 3.1 pm (383 MHz), thus achieving a compression factor of over 270. We show a compression gain by increasing the aperture of a Fresnel time lens (temporal waveform duration). We demonstrate a similar compression on a single-photon level from ~1.5 nm (~190 GHz) down to the sub-2GHz regime. Our findings should significantly improve the performance of future quantum information processors based on hybrid quantum networks.
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