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Komunikasi Fisika Indonesia

MULTI-PHOTONS TRAPPING STABILITY WITHIN A FIBER BRAGG GRATING FOR QUANTUM SENSOR USE

Saktioto Saktioto

Published Jun 20, 2014• 0 citations
OpenAlex

Abstract

We propose an interesting result of the trapped multi photons distribution within a fiber Bragg grating. Thetrapped photons are confined by the potential well, which introduce the motion of photons in a fiber Bragg gratingaffected by multi perturbations. The external perturbations are defined as series of nonlinear parametric in terms ofpotential energy. This investigation is developed by using the nonlinear couple mode equations and under Braggresonance condition where the initial frequency of the light,  0 is the same value as the Bragg frequency,  B . Theresults show that the higher perturbation series represents the potential well is much indifferent of equilibrium. Inapplications, the perturbation can cause the trapped photons instability which introduces the escape photons from thepotential well. The applications such as entangled photon source and quantum sensors can be performed.

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We propose an interesting result of the trapped multi photons distribution within a fiber Bragg grating. Thetrapped photons are confined by the potential well, which introduce the motion of photons in a fiber Bragg gratingaffected by multi perturbations. The external perturbations are defined as series of nonlinear parametric in terms ofpotential energy. This investigation is developed by using the nonlinear couple mode equations and under Braggresonance condition where the initial frequency of the light,  0 is the same value as the Bragg frequency,  B . Theresults show that the higher perturbation series represents the potential well is much indifferent of equilibrium. Inapplications, the perturbation can cause the trapped photons instability which introduces the escape photons from thepotential well. The applications such as entangled photon source and quantum sensors can be performed.
We propose an interesting result of the trapped multi photons distribution within a fiber Bragg grating. The trapped photons are con?ned by the potential well, which introduce the motion of photons in a ?ber Bragg grating a?ected by multi perturbations. The external perturbations are de?ned as series of nonlinear parametric in terms of potential energy. This in- vestigation is developed by using the nonlinear couple mode equations and under Bragg resonance condition where the initial frequency of the light, ?0 is the same value as the Bragg frequency, ?B . The results show that the higher perturbation series represents the potential well is much indi?erent of equilibrium. In applications, the perturbation can cause the trapped photons in- stability which introduces the escape photons from the potential well. The applications such as entangled photon source and quantum sensors can be performed.
Quantum sensing has now become one of the most advanced, rapidly growing areas of research, which permits precise scale of measurement. We have experimentally demonstrated a novel method of probing quantum phenomena of lightmatter interaction especially the fluorescence by utilizing matured fiber Bragg grating (FBG) technology. In response to the incident excitation, quantum electrodynamic response of fluorophores coated on the FBG causes a shift in the Bragg wavelength. The Bragg wavelength shift is dependent on excitation wavelength and intensity, where the increased lightmatter interaction leads to a higher shift in the Bragg wavelength. Our sensor could probe the fluorescence at microscopic scale showing Bragg wavelength shift of 10 pm per 400 μW of incident excitation power. Capturing fluorescence at this small scale with microwatt of excitation power can be potentially helpful for biosensing applications where the photodamage limit of excitation power is crucial for the dynamic measurement of biological specimens.
Abstract In the realm of quantum information processing and precision measurements, a range of non-classical effects based on entangled photon pairs are employed. Non-local dispersion cancellation is one of these properties, in which the second photon (idler) can be manipulated to cancel the effects of dispersion on the first photon (signal). In the present study, a thorough investigation is conducted into non-local dispersion cancellation by using excitation modes within a Bragg grating slab waveguide. We present a complete theoretical analysis of non-local dispersion cancellation for frequency-limited entangled photon pairs. For the analysis of the effect of dispersion cancellation, we use a spontaneous parametric down-conversion (SPDC) photon pair source with frequency correlation and anti-correlation as the entangled source. To evaluate the dispersion cancellation effect for information processing applications, the second correlation function is used and calculated as a practical and tangible metric. Considering different cases for Bragg Grating waveguide the results on both photons are extracted and discussed. Moreover, we will show that the physical parameters of the waveguide that the second photon is propagated inside will be effective in minimizing the width of the temporal correlation function. Hence, this study underscores the feasibility of achieving non-local dispersion cancellation through strategic optimization of optical and geometric parameters in the Bragg Grating waveguide, with potential implications for quantum information processing and high-resolution sensing endeavors.
Fiber optical parametric oscillators are being busily investigated as sources of classical light, but are comparatively neglected as potential quantum light sources. Squeezed light is a crucial resource for emerging quantum technologies for computing, communications, and measurement. The direct generation of squeezed light inside optical fiber is of particular interest due to minimal material loss, desirable mode properties and compatibility with long-distance optical networks. Here, we describe a novel all-fiber continuous-wave optical parametric oscillator developed with the aim of generating squeezed light. Our device is based on a 10 cm Fabry-Perot cavity formed by two high-reflectivity fiber Bragg gratings written directly into a single section of photonic crystal fiber. This enables low-loss optical feedback and strongly resonance-enhanced four-wave mixing, with a cavity finesse of up to 400. We observe resonance-enhanced four-wave mixing in these devices, demonstrating a step towards their application as quantum light sources.
Deterministic sources of quantum light are becoming increasingly relevant in the development of quantum communication, particularly in deployed fiber networks. Therefore, efficient fiber-coupled sources at telecom wavelength are highly sought after. With this goal in mind, we systematically investigate the fiber coupling performance of quantum dots in optical resonators under three experimental configurations. We quantify coupling efficiency and sensitivity to spatial displacement for single-mode fibers with 3D printed optics on their tip, and benchmark their behavior over a commercial cleaved-cut fiber and a standard optical setup. The reduction of the required optical elements when operating with a lensed or a bare fiber allows for an increased end-to-end efficiency by a factor of up to 3.0 +/- 0.2 over a standard setup. For the perspective of realizing a mechanically stable fiber-coupled source, we precisely quantify the spatial tolerance to fiber-cavity misalignment, observing less than 50 % count rate drop for several micrometers displacement. These results will play a key role in the future development of fiber-coupled sources of quantum light.