Photon pair generation from lithium niobate metasurface with tunable spatial entanglement
arXiv:2308.16439 · doi:10.3788/COL202321.010005
Abstract
Two-photon state with spatial entanglement is an essential resource for testing fundamental laws of quantum mechanics and various quantum applications. Its creation typically relies on spontaneous parametric down-conversion in bulky nonlinear crystals where the tunability of spatial entanglement is limited. Here, we predict that ultrathin nonlinear lithium niobate metasurfaces can generate and diversely tune spatially entangled photon pairs. The spatial properties of photons including the emission pattern, rate, and degree of spatial entanglement are analysed theoretically with the coupled mode theory and Schmidt decomposition method. We show that by leveraging the strong angular dispersion of the metasurface, the degree of spatial entanglement quantified by the Schmidt number can be decreased or increased by changing the pump laser wavelength and a Gaussian beam size. This flexibility can facilitate diverse quantum applications of entangled photon states generated from nonlinear metasurfaces.
References in corpus (12)
- Quantum entanglement
- Analysis and interpretation of high transverse entanglement in optical parametric down conversion
- Spatial correlations in parametric down-conversion
- Resonant Semiconductor Metasurfaces for Generating Complex Quantum States
- Spatially entangled photon-pairs from lithium niobate nonlocal metasurfaces
- Spontaneous photon-pair generation at the nanoscale
- Generation of photon-plasmon quantum states in nonlinear hyperbolic metamaterials
- Super-Resolution Quantum Imaging at the Heisenberg Limit
- Schmidt modes generated in parametric downconversion
- Direct characterization of a nonlinear photonic circuit's wave function with laser light
- Idealised EPR states from non-phase matched parametric down conversion
- The effect of scattering loss on connections between classical and quantum processes in second-order nonlinear waveguides
Cited by in corpus (5)
- Polarization engineering of entangled photons from a lithium niobate nonlinear metasurface
- Engineering Quantum Light Sources with Flat Optics
- Quantum Imaging Using Spatially Entangled Photon Pairs from a Nonlinear Metasurface
- Directionally Tunable Co- and Counter-Propagating Photon Pairs from a Nonlinear Metasurface
- Broadband bright biphotons from periodically poled triple-resonance metasurface