Spatially entangled photon-pairs from lithium niobate nonlocal metasurfaces
arXiv:2204.01890 · doi:10.1126/sciadv.abq4240
Abstract
Metasurfaces consisting of nano-scale structures are underpinning new physical principles for the creation and shaping of quantum states of light. Multi-photon states that are entangled in spatial or angular domains are an essential resource for quantum imaging and sensing applications, however their production traditionally relies on bulky nonlinear crystals. We predict and demonstrate experimentally the generation of spatially entangled photon pairs through spontaneous parametric down-conversion from a metasurface incorporating a nonlinear thin film of lithium niobate. This is achieved through nonlocal resonances with tailored angular dispersion mediated by an integrated silica meta-grating, enabling control of the emission pattern and associated quantum states of photon pairs by designing the grating profile and tuning the pump frequency. We measure the correlations of photon positions and identify their spatial anti-bunching through violation of the classical Cauchy-Schwartz inequality, witnessing the presence of multi-mode entanglement. Simultaneously, the photon-pair rate is strongly enhanced by 450 times as compared to unpatterned films due to high-quality-factor metasurface resonances, and the coincidence to accidental ratio reaches 5000. These results pave the way to miniaturization of various quantum devices by incorporating ultra-thin metasurfaces functioning as room-temperature sources of quantum-entangled photons.
References in corpus (10)
- Integrated photonics on thin-film lithium niobate
- Full-field quantum correlations of spatially entangled photons
- Transverse Entanglement Migration in Hilbert Space
- Enhanced generation of non-degenerate photon-pairs in nonlinear metasurfaces
- Violation of the Cauchy-Schwarz inequality with matter waves
- Efficient single-photon pair generation by spontaneous parametric down-conversion in nonlinear plasmonic metasurfaces
- One-dimensional quasi bound states in the continuum in the ω~k space for nonlinear optical applications
- Quantum nonlinear metasurfaces
- Broadband photon pair generation from a single lithium niobate microcube
- Infrared full-Stokes polarimetry by parametric up-conversion
Cited by in corpus (30)
- Resonant Semiconductor Metasurfaces for Generating Complex Quantum States
- Minireview on Disordered Optical Metasurfaces
- High-efficiency optical frequency mixing in an all-dielectric metasurface enabled by multiple bound states in the continuum
- Enhanced third-harmonic generation empowered by doubly degenerate quasi-bound states in the continuum
- Enhanced sum-frequency generation from etchless lithium niobate empowered by dual quasi-bound states in the continuum
- Barium Titanate and Lithium Niobate Permittivity and Pockels Coefficients from MHz to Sub-THz Frequencies
- Polarization engineering of entangled photons from a lithium niobate nonlinear metasurface
- Enhanced infrared vision by nonlinear up-conversion in nonlocal metasurfaces
- Engineering Quantum Light Sources with Flat Optics
- Efficient photon-pair generation empowered by dual quasi-bound states in the continuum
- Quantum Imaging Using Spatially Entangled Photon Pairs from a Nonlinear Metasurface
- Nonlocal phase-change metaoptics for reconfigurable nonvolatile image processing
- Directionally Tunable Co- and Counter-Propagating Photon Pairs from a Nonlinear Metasurface
- Nonlinear Nanoresonators for Bell State Generation
- Generation of tunable quantum entanglement via nonlinearity symmetry breaking in semiconductor metasurfaces
- Quantum Pair Generation in Nonlinear Metasurfaces with Mixed and Pure Photon Polarizations
- Enhanced second harmonic generation in high- all-dielectric metasurfaces with backward frequency conversion
- Enhanced photon-pair generation from a van der Waals metasurface
- Photon pair generation from lithium niobate metasurface with tunable spatial entanglement
- Time-resolved purification of photon pairs from ultrasmall sources
- Electro-optically tunable second-harmonic generation in lithium niobate metasurfaces boosted by Brillouin zone folding induced bound states in the continuum
- Non-perturbative theory of spontaneous parametric down-conversion in open and dispersive optical systems
- High-efficiency infrared upconversion imaging with nonlinear silicon metasurfaces empowered by quasi-bound states in the continuum
- Third-Order Spontaneous Parametric Down Conversion in Dielectric Nonlinear Resonant Metasurfaces
- Spatially resolved photon statistics of general nanophotonic systems
- Nonlinear Quantum Electrodynamics of Epsilon-Near-Zero Nanocavities
- Enhanced Tunable Photon Pair Generation from Nonlinear Metasurface with Guided-Mode Cavity
- Broadband bright biphotons from periodically poled triple-resonance metasurface
- Chiral Spontaneous Photon-Pair Generation with Plasmonic Bound States in the Continuum
- Light-cone-proximal quasi-BICs for chiral lasing at grazing angles