Suppression of Parasitic Nonlinear Processes in Spontaneous Four-Wave Mixing with Linearly Uncoupled Resonators

Sabattoli, Federico Andrea; Dirani, Houssein El; Youssef, Laurène; Garrisi, Francesco; Grassani, Davide; Zatti, Luca; Petit-Etienne, C.; Pargon, E.; Sipe, J. E.; Liscidini, Marco; Sciancalepore, Corrado; Bajoni, Daniele; Galli, Mattéo

doi:10.1103/physrevlett.127.033901

Cited by 13 publications

(10 citation statements)

References 22 publications

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“…Different routes have been explored in this regard, for example the emission of defects in diamonds or semiconductors [8][9][10] , artificial solid state quantum emitters such as quantum dots [11][12][13] , and parametric processes exploiting intrinsic material nonlinearity. Correlated photon pairs spontaneously generated via parametric processes can be used to build heralded SPSs [14][15][16][17][18] , in which the detection of one photon in one input channel heralds the presence of its twin photon in the other. Such processes can provide highly coherent entangled states but, relying on spontaneous processes, the pair emission is random and the source is probabilistic, making it crucial to achieve the highest generation efficiency.…”

mentioning

confidence: 99%

Ultra-efficient generation of time-energy entangled photon pairs in a InGaP Photonic Crystal Cavity

Chopin

Barone²,

Ghorbel

et al. 2022

Preprint

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Time-energy entangled photon pairs and heralded single photons are generated in a 25 μm-long, In0.5Ga0.5P Photonic Crystal cavity via degenerate Spontaneous Four-Wave-Mixing with a very large efficiency (16 GHz/mW2), owing to the very small confinement volume. Maximal efficiency is reached via thermal tuning, which compensates for the frequency mismatch of the cavity modes. A large off-chip coincidence rate (70 kHz) is measured with pump power ≈ 36 μW. Time-energy entanglement is measured with raw visibility up to 93.88 % using 1 second integration time constant. This qualifies photonic crystal cavities as sources for quantum photonics.

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confidence: 99%

Ultra-efficient generation of time-energy entangled photon pairs in a InGaP Photonic Crystal Cavity

Chopin

Barone²,

Ghorbel

et al. 2022

Preprint

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“…We considered two strategies to uncouple the racetracks: via the use of a directional coupler and via the use of a Mach-Zehnder interferometer. The DC approach is simple and can be realized in compact structures [23], but it has two main drawbacks: first, its properties can be considered frequency independent only over a limited bandwidth of typically a few tens of nanometers at telecom wavelengths; second, the fields inside the coupler oscillate, reducing the nonlinear interaction efficiency. On the other hand, the MZI approach guarantees linear uncoupling isolation over a much larger bandwidth (hundreds of nanometers [28], thanks to the much lower frequency-sensitivity of the interference mechanism, and offers a higher conversion efficiency, given that the slowlyvarying envelope functions of the fields do not oscillate.…”

Section: Discussionmentioning

confidence: 99%

“…We can estimate the pair-production rate for each structure once the expression of the overlap integral is evaluated. Again, in general the integral in (23) needs to be evaluated numerically, but with the approximation of the Lorentzian shape of the intensity enhancement, described by eq. ( 3), we can write an analytic expression for the pair generation rate.…”

Section: Comparing Sfwm Generation Ratesmentioning

confidence: 99%

“…phase-matching) to those needed to suppress unwanted parasitic processes. To date, the experimental realization of this approach has made use of racetrack resonators placed side-by-side forming a directional coupler (DC), with stimulated and spontaneous four-wave mixing demonstrated in silicon nitride [21] and silicon [22,23] resonators, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Generation of photon pairs by spontaneous four-wave mixing in linearly uncoupled resonators

2023

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We present a detailed study of the generation of photon pairs by spontaneous four-wave mixing in a structure composed of two linearly uncoupled resonators, where energy can be transferred from one resonator to another only through a nonlinear interaction. Specifically, we consider the case of two racetrack-shaped resonators connected by a coupler designed to guarantee that the resonance comb of each resonator can be tuned independently, and to allow the nonlinear interaction between modes that belong to different combs. We show that such a coupler can be realized in at least two ways: a directional coupler or a Mach-Zehnder interferometer. For these two scenarios, we derive analytic expressions for the pair generation rate via single-pump spontaneous four-wave mixing, and compare these results with that achievable in a single ring resonator.

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“…The peculiar transmission spectrum of the nonliear microresonator results into unprecedented efficiency in hyperparametric oscillation, and the generation of signal and idler waves with high optical power. The possibility to engineer the spectral response of the intrinsic quality factor of high-Q microresonators facilitates the generation and manipulation of squeezed or entangled states of light [7,[63][64][65][66].…”

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confidence: 99%

Hyperparametric oscillation via bound states in the continuum

Lei¹,

Ye²,

Twayana³

et al. 2022

Preprint

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Optical hyperparametric oscillation based on third-order nonlinearity is one of the most significant mechanisms to generate coherent electromagnetic radiation and produce quantum states of light. Advances in dispersion-engineered high-Q microresonators allow for generating signal waves far from the pump and decrease the oscillation power threshold to sub-milliwatt levels. However, the pumpto-signal conversion efficiency and absolute signal power are low, fundamentally limited by parasitic mode competition. Here, we show that Friedrich-Wintgen bound states in the continuum provide a means to coherently suppress the decay channels for certain degenerate resonant frequencies. This effect results in a quasi-periodic frequency response in the intrinsic quality factor that suppresses undesired mode competition and non-degenerate four-wave mixing, and results into pure hyperparametric oscillation with unprecedented conversion efficiency and absolute signal power. This work not only opens a path to generate high-power and efficient continuous-wave electromagnetic radiation in Kerr nonlinear media but also enhances the understanding of microresonator-waveguide system -an elementary unit of modern photonics.

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Suppression of Parasitic Nonlinear Processes in Spontaneous Four-Wave Mixing with Linearly Uncoupled Resonators

Cited by 13 publications

References 22 publications

Ultra-efficient generation of time-energy entangled photon pairs in a InGaP Photonic Crystal Cavity

Ultra-efficient generation of time-energy entangled photon pairs in a InGaP Photonic Crystal Cavity

Generation of photon pairs by spontaneous four-wave mixing in linearly uncoupled resonators

Hyperparametric oscillation via bound states in the continuum

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