Ultra-broadband Entangled Photons on a Nanophotonic Chip

Abstract

Nanophotonic entangled-photon sources are a critical building block of chip-scale quantum photonic architecture and have seen significant development over the past two decades. These sources generate photon pairs that typically span over a narrow frequency bandwidth. Generating entanglement over a wide spectral region has proven to be useful in a wide variety of applications including quantum metrology, spectroscopy and sensing, and optical communication. However, generation of broadband photon pairs with temporal coherence approaching an optical cycle on a chip is yet to be seen. Here we demonstrate generation of ultra-broadband entangled photons using spontaneous parametric down-conversion in a periodically-poled lithium niobate nanophotonic waveguide. We employ dispersion engineering to achieve a bandwidth of 100 THz (1.2 - 2 $\mu$m), at a high efficiency of 13 GHz/mW. The photons show strong temporal correlations and purity with the coincidence-to-accidental ratio exceeding $10^5$ and $>$ 98\% two-photon interference visibility. These properties together with the piezo-electric and electro-optic control and reconfigurability, make thin-film lithium niobate an excellent platform for a controllable entanglement source for quantum communication and computing, and open a path towards femtosecond metrology and spectroscopy with non-classical light on a nanophotonic chip.

arXiv comment10 pages, 7 figures

References in corpus (31)

• Advances in Quantum Metrology
• Quantum Interferometric Optical Lithography: Exploiting Entanglement to Beat The Diffraction Limit
• Integrated Photonic Quantum Technologies
• Wavelength-Multiplexed Quantum Networks with Ultrafast Frequency Combs
• Quantum enhanced positioning and clock synchronization
• Entangled photon-pair generation in periodically-poled thin-film lithium niobate waveguides
• Chip-based photon quantum state sources using nonlinear optics
• Quantum optical coherence tomography with dispersion cancellation
• Continuous wave photon pair generation in silicon-on-insulator waveguides and ring resonators
• Chip-integrated visible-telecom photon pair sources for quantum communication
• Two photon absorption and coherent control with broadband down-converted light
• Photon Pair Generation in Silicon Micro-Ring Resonator with Reverse Bias Enhancement
• Ultra-bright Quantum Photon Sources on Chip
• Entanglement distribution over 300 km of fiber
• Distant Clock Synchronization Using Entangled Photon Pairs
• Silicon Photonic Entangled Photon-Pair and Heralded Single Photon Generation with CAR $>$ 12,000 and $g^{(2)}(0)<$ 0.006
• An Efficient Integrated Two-Color Source for Heralded Single Photons
• 0.54 μm resolution two-photon interference with dispersion cancellation for quantum optical coherence tomography
• Noncollinear parametric fluorescence by chirped quasi-phase matching for monocycle temporal entanglement
• Correlated photon-pair generation in reverse-proton-exchange PPLN waveguides with integrated mode demultiplexer at 10 GHz clock
• On-chip multiplexed multiple entanglement sources in a single silicon nanowire
• Observation of ultra-broadband, beamlike parametric downconversion
• Versatile shaper-assisted discretization of energy-time entangled photons
• Broadband bright twin beams and their up-conversion
• Correlated photon pair generation in AlGaAs nanowaveguides via spontaneous four-wave mixing
• Monolithic Semiconductor Chips as a Source for Broadband Wavelength-Multiplexed Polarization Entangled Photons
• Generation of broadband spontaneous parametric fluorescence using multiple bulk nonlinear crystals
• Broadband biphotons in a single spatial mode
• Biphoton Spectrum Control
• Ultra-Broadband Coherence-Domain Imaging Using Parametric Downconversion and Superconducting Single-Photon Detectors at 1064 nm
• Quantum correlations from dynamically modulated optical nonlinear interactions

Cited by in corpus (8)

• Few-cycle vacuum squeezing in nanophotonics
• Spectral control of nonclassical light using an integrated thin-film lithium niobate modulator
• Locally-acting mirror Hamiltonians
• Local photons
• Graphene as a source of entangled plasmons
• Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler
• Detecting the relative phase between different frequency components of a photon using a three-level $\Lambda$ atom coupled to a waveguide
• Attosecond Entangled Photons from Two-Photon Decay of Metastable Atoms: A Source for Attosecond Experiments and Beyond