InGaP ${\chi }^{(2)}$ integrated photonics platform for broadband, ultra-efficient nonlinear conversion and entangled photon generation

Abstract

Nonlinear optics plays an important role in many areas of science and technology. The advance of nonlinear optics is empowered by the discovery and utilization of materials with growing optical nonlinearity. Here we demonstrate an indium gallium phosphide (InGaP) integrated photonics platform for broadband, ultra-efficient second-order nonlinear optics. The InGaP nanophotonic waveguide enables second-harmonic generation with a normalized efficiency of $128,000\%$/W/cm${}^2$ at 1.55 $\mu$m pump wavelength, nearly two orders of magnitude higher than the state of the art in the telecommunication C band. Further, we realize an ultra-bright, broadband time-energy entangled photon source with a pair generation rate of 97 GHz/mW and a bandwidth of 115 nm centered at the telecommunication C band. The InGaP entangled photon source shows high coincidence-to-accidental counts ratio CAR $>10^4$ and two-photon interference visibility $>98\%$. The InGaP second-order nonlinear photonics platform will have wide-ranging implications for non-classical light generation, optical signal processing, and quantum networking.

References in corpus (7)

• Detection of 15 dB Squeezed States of Light and their Application for the Absolute Calibration of Photoelectric Quantum Efficiency
• Second harmonic generation in nano-structured thin-film lithium niobate waveguides
• Second harmonic generation in phase matched aluminum nitride waveguides
• Photonic Crystal Optical Parametric Oscillator
• Wavelength- and material-dependent absorption in GaAs and AlGaAs microcavities
• A source of polarization-entangled photon pairs interfacing quantum memories with telecom photons
• Efficient Type II Second Harmonic Generation in an Indium Gallium Phosphide on insulator wire waveguide aligned with a crystallographic axis

Cited by in corpus (8)

• Toward ultimate-efficiency frequency conversion in nonlinear optical microresonators
• Generation of tunable quantum entanglement via nonlinearity symmetry breaking in semiconductor metasurfaces
• Faithful quantum teleportation via a nanophotonic nonlinear Bell state analyzer
• Photon pair generation via down-conversion in III-V semiconductor microrings: modal dispersion and quasi-phase matching
• Experimental entanglement swapping through single-photon ${\chi }^{(2)}$ nonlinearity
• Perspectives on epitaxial InGaP for quantum and nonlinear optics
• Scalable quantum interference in integrated lithium niobate nanophotonics
• Fidelity and efficiency analysis for heralded entanglement swapping in lossy channels: linear and nonlinear optical approaches