We have demonstrated anticorrelated light switching between multiphoton transition channels in a nonresonant double-Λ system. Two-color probe transitions, using rubidium D1 (795 nm) and D2 (780 nm), were included in our double-Λ system. In anticorrelated light switching, one of two probe transitions is selected as transparent while the other is selected as opaque. In this configuration, we observed completely different behavior from that seen in a resonant double-Λ system, in which both probe transmissions are transparent or opaque simultaneously. Furthermore, we observed a noise correlation between two-color probe transmissions when the phase fluctuation of the two probe lasers was converted to the intensity fluctuation. The relative phase fluctuation between the two probe lasers induced an anticorrelation between the intensity noises of two probe lasers in a nonresonant double-Λ system, while a correlation was induced in a resonant double-Λ system. The intensity fluctuation (correlated or anticorrelated) was easily controlled by detuning the double-Λ system. The noise anticorrelation effect is clearly interpreted as arising from the anticorrelated light switching in a nonresonant double-Λ system. This system can be used for noise control as well as optical switching between incoherent two-color laser lights.We have demonstrated anticorrelated light switching between multiphoton transition channels in a nonresonant double-Λ system. Two-color probe transitions, using rubidium D1 (795 nm) and D2 (780 nm), were included in our double-Λ system. In anticorrelated light switching, one of two probe transitions is selected as transparent while the other is selected as opaque. In this configuration, we observed completely different behavior from that seen in a resonant double-Λ system, in which both probe transmissions are transparent or opaque simultaneously. Furthermore, we observed a noise correlation between two-color probe transmissions when the phase fluctuation of the two probe lasers was converted to the intensity fluctuation. The relative phase fluctuation between the two probe lasers induced an anticorrelation between the intensity noises of two probe lasers in a nonresonant double-Λ system, while a correlation was induced in a resonant double-Λ system. The intensity fluctuation (correlated or anticorrelated) was easily controlled by detuning the double-Λ system. The noise anticorrelation effect is clearly interpreted as arising from the anticorrelated light switching in a nonresonant double-Λ system. This system can be used for noise control as well as optical switching between incoherent two-color laser lights.

Journal of the Optical Society of America BJan 9, 20153 citations

Correlated intensity fluctuations in a double resonance experiment

George William Series, D. M. Warrington

Optics CommunicationsApr 1, 19691 citation

Fluctuation-Driven Nonlinear Amplification of Quantum Statistics

Yuewei Song, Zhenghe Zhou, Shuai Wan +9 more

Photon statistics have moved to the forefront of modern optics, as intensity fluctuations and correlations shape multiphoton interactions and reveal information beyond mean-intensity measurements. Developing high-quality photon sources with pronounced correlations is a fundamental necessity in these fields. Here we demonstrate fluctuation-driven nonlinear statistical amplification of quantum light in spontaneous four-wave mixing using filtered amplified spontaneous emission (ASE). Extending the coherent-pump framework to fluctuating fields, we show how nonlinear weighting of pump intensity combines with bosonic bunching to amplify quantum statistics and reshape temporal correlations. In a SiN microring, ASE pumping increases the zero-delay unconditional second-order correlation from 2.01 to 7.58 and extends the Hanbury Brown--Twiss correlation time by a factor of approximately 2.4. The super-bunched quantum source nevertheless retains heralded single-photon behaviour with $g_H^{(2)}(0)\simeq0.04$ , while the same ASE pump supports time--energy entanglement in a silicon waveguide with a raw Franson visibility of 89.84\%. These results establish driving-field statistics as a design dimension for quantum light, broadening the horizons for research into higher-order correlations and nonlinear physics.Photon statistics have moved to the forefront of modern optics, as intensity fluctuations and correlations shape multiphoton interactions and reveal information beyond mean-intensity measurements. Developing high-quality photon sources with pronounced correlations is a fundamental necessity in these fields. Here we demonstrate fluctuation-driven nonlinear statistical amplification of quantum light in spontaneous four-wave mixing using filtered amplified spontaneous emission (ASE). Extending the coherent-pump framework to fluctuating fields, we show how nonlinear weighting of pump intensity combines with bosonic bunching to amplify quantum statistics and reshape temporal correlations. In a SiN microring, ASE pumping increases the zero-delay unconditional second-order correlation from 2.01 to 7.58 and extends the Hanbury Brown--Twiss correlation time by a factor of approximately 2.4. The super-bunched quantum source nevertheless retains heralded single-photon behaviour with $g_H^{(2)}(0)\simeq0.04$, while the same ASE pump supports time--energy entanglement in a silicon waveguide with a raw Franson visibility of 89.84\%. These results establish driving-field statistics as a design dimension for quantum light, broadening the horizons for research into higher-order correlations and nonlinear physics.

quant-pharXiv:2609.26674Sep 23, 20260 citations

Innovative Uses of Stochastic Photonic Sources

Jean-Christophe Delaanes, Jérôme Lhermite, Nicolas Valero +4 more

We report on the properties and applications of intense and nonconventional stochastic photonic sources based on amplified spontaneous emission (ASE) [1]. First, we describe the principle of nonlinear intensity filtering using various nonlinear filters (e.g. a modified nonlinear Mach-Zehnder interferometer). The latter can alter the properties of an intense incident ASE source in a controlled manner. In particular, we demonstrated the possibility to tailor the probability density function (PDF) $p(I)$ ) (Fig. 1.a) as well as the second- and, in a more general sense, the $n$ -th order degree of coherence $g^{(n \geq 1)}\left(\tau\right.)$ ) associated with the likelihood and the correlation of the intensity fluctuations, respectively. Depending on the type of filter and its parameters, the resulting random intensity $I(t)$ can exhibit large overshoots or smoother fluctuations.We report on the properties and applications of intense and nonconventional stochastic photonic sources based on amplified spontaneous emission (ASE) [1]. First, we describe the principle of nonlinear intensity filtering using various nonlinear filters (e.g. a modified nonlinear Mach-Zehnder interferometer). The latter can alter the properties of an intense incident ASE source in a controlled manner. In particular, we demonstrated the possibility to tailor the probability density function (PDF)$p(I)$) (Fig. 1.a) as well as the second- and, in a more general sense, the$n$-th order degree of coherence$g^{(n \geq 1)}\left(\tau\right.)$) associated with the likelihood and the correlation of the intensity fluctuations, respectively. Depending on the type of filter and its parameters, the resulting random intensity$I(t)$can exhibit large overshoots or smoother fluctuations.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Jun 23, 20250 citations

INTENSITY CORRELATIONS IN COHERENT BACKWARD SCATTERING

Vladimir L. Kuzmin, V. P. Romanov

Optics and SpectroscopyMay 1, 19980 citations

g_H^{(2)}(0)\simeq0.04

, while the same ASE pump supports time--energy entanglement in a silicon waveguide with a raw Franson visibility of 89.84\%. These results establish driving-field statistics as a design dimension for quantum light, broadening the horizons for research into higher-order correlations and nonlinear physics.

p(I)

) (Fig. 1.a) as well as the second- and, in a more general sense, the

n

-th order degree of coherence

g^{(n \geq 1)}\left(\tau\right.)

) associated with the likelihood and the correlation of the intensity fluctuations, respectively. Depending on the type of filter and its parameters, the resulting random intensity

I(t)

can exhibit large overshoots or smoother fluctuations.