Reply to “Comment on ‘Dynamics of slow light and light storage in a Doppler-broadened electromagnetically-induced-transparency medium: A numerical approach’ ”

We report the generation of biphotons, with a temporal full width at the half maximum (FWHM) of 13.4{plus minus}0.3 μs and a spectral FWHM of 50{plus minus}1 kHz, via the process of spontaneous four-wave mixing. The temporal width is the longest, and the spectral linewidth is the narrowest up to date. This is also the first biphoton result that obtains a linewidth below 100 kHz, reaching a new milestone. The very long biphoton wave packet has a signal-to-background ratio of 3.4, which violates the Cauchy-Schwarz inequality for classical light by 4.8 folds. Furthermore, we demonstrated a highly-tunable-linewidth biphoton source and showed that while the biphoton source's temporal and spectral width were controllably varied by about 24 folds, its generation rate only changed by less than 15%. A spectral brightness or generation rate per pump power per linewidth of 1.2×106 pairs/(s·mW·MHz) was achieved at the temporal width of 13.4 µs. The above results were made possible by the low decoherence rate and high optical depth of the experimental system, as well as a novel scheme of classical fields' and biphotons' propagation directions in the experiment. This work has demonstrated a high-efficiency ultranarrow-linewidth biphoton source, and has made a substantial advancement in the quantum technology utilizing heralded single photons.

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Temporally ultralong biphotons with a linewidth of 50 kHz

Wang

Chang

Lin

et al. 2022

APL Photonics

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Effect of laser-frequency fluctuation on the decay rate of Rydberg coherence

et al. 2019

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The effect of electromagnetically induced transparency (EIT) combined with Rydberg-state atoms provides high optical nonlinearity to efficiently mediate the photon-photon interaction. However, the decay rate of Rydberg coherence, i.e., the decoherence rate, plays an important role in optical nonlinear efficiency, and can be largely influenced by laser frequency fluctuation. In this work, we carried out a systematic study of the effect of laser frequency fluctuation on the decoherence rate. We derived an analytical formula that quantitatively describes the relationship between the decoherence rate and laser frequency fluctuation. The formula was experimentally verified by using the Λ-type EIT system of laser-cooled 87 Rb atoms, in which one can either completely eliminate or controllably introduce the effect of laser frequency fluctuation. We also included the effect of Doppler shift caused by the atomic thermal motion in the formula, which can be negligible in the Λ-type EIT experiment but significant in the Rydberg-EIT experiment. Utilizing the atoms of 350 µK, we studied the decoherence rate in the Rydberg-EIT system involving with the state of |32D 5/2 . The experimental data are consistent with the predictions from the formula. We were able to achieve a rather low decoherence rate of 2π×48 kHz at a moderate coupling Rabi frequency of 2π×4.3 MHz.

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Reply to “Comment on ‘Dynamics of slow light and light storage in a Doppler-broadened electromagnetically-induced-transparency medium: A numerical approach’ ”

Cited by 2 publications

References 19 publications

Temporally ultralong biphotons with a linewidth of 50 kHz

Temporally ultralong biphotons with a linewidth of 50 kHz

Effect of laser-frequency fluctuation on the decay rate of Rydberg coherence

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