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- 摘要
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- 实验方案
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Controlled-Phase Gate Using Dynamically Coupled Cavities and Optical Nonlinearities
摘要： We show that relatively simple integrated photonic circuits have the potential to realize a high fidelity deterministic controlled-phase gate between photonic qubits using bulk optical nonlinearities. The gate is enabled by converting travelling continuous-mode photons into stationary cavity modes using strong classical control fields that dynamically change the effective cavity-waveguide coupling rate. This architecture succeeds because it reduces the wave packet distortions that otherwise accompany the action of optical nonlinearities [J. Shapiro, Phys. Rev. A 73, 062305 (2006); J. Gea-Banacloche, Phys. Rev. A 81, 043823 (2010)]. We show that high-fidelity gates can be achieved with self-phase modulation in χ(3) materials as well as second-harmonic generation in χ(2) materials. The gate fidelity asymptotically approaches unity with increasing storage time for an incident photon wave packet with fixed duration. We also show that dynamically coupled cavities enable a trade-off between errors due to loss and wave packet distortion. Our proposed architecture represents a new approach to practical implementation of quantum gates that is room-temperature compatible and only relies on components that have been individually demonstrated.
关键词： optical nonlinearities,integrated photonic circuits,photonic qubits,quantum gates,controlled-phase gate
更新于2025-09-19 17:13:59
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Low Loss Suspended Silicon Waveguide and Photonic Crystal for THz Regime
摘要： Terahertz integrated photonic circuits are used in many applications. In recent years we are witnessing an unprecedented development of applications of THz waves such as identifications of pollutants, safety imaging, high data transmission, detection of organic molecules in space… The majority of these systems however still rely on voluminous, free-space implementations necessitating powerful bulky THz sources and detectors. The development of a low-loss chip-scale integrated photonic platform for THz waves and the associated increased energy confinement could bring about a performance/cost ratio for these technologies. Up till now reports of integrated mm-wave and THz integrated circuits have been few and far between, hindered by important on-chip waveguide losses, and requiring important technological fabrication efforts [1], [2]. In this work we present experimental work on a low-loss and low-cost, suspended silicon waveguide technology at millimetric scale for THz frequencies. Specifically, we present loss extractions measured on waveguides of varying length and first results on integrated cavities, obtained by etching a 1D crystal in the suspended waveguide. These results prove versatility and viability of this new technological platform for integrated THz sensing and spectroscopy applications.
关键词： photonic crystal,integrated photonic circuits,silicon waveguide,Terahertz,low-loss
更新于2025-09-16 10:30:52
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Hybrid Integrated Semiconductor Lasers with Silicon Nitride Feedback Circuits
摘要： Hybrid integrated semiconductor laser sources offering extremely narrow spectral linewidth, as well as compatibility for embedding into integrated photonic circuits, are of high importance for a wide range of applications. We present an overview on our recently developed hybrid-integrated diode lasers with feedback from low-loss silicon nitride (Si3N4 in SiO2) circuits, to provide sub-100-Hz-level intrinsic linewidths, up to 120 nm spectral coverage around a 1.55 μm wavelength, and an output power above 100 mW. We show dual-wavelength operation, dual-gain operation, laser frequency comb generation, and present work towards realizing a visible-light hybrid integrated diode laser.
关键词： low-loss Si3N4 waveguides,dual-wavelength laser,laser frequency comb,InP semiconductor optical amplifier,integrated photonic circuits,semiconductor laser,hybrid integration,narrow intrinsic linewidth
更新于2025-09-16 10:30:52