Tunable Generation of Spatial Entanglement in Nonlinear Waveguide Arrays
arXiv:2405.08176 · doi:10.1103/PhysRevLett.133.233602
Abstract
Harnessing high-dimensional entangled states of light presents a frontier for advancing quantum information technologies, from fundamental tests of quantum mechanics to enhanced computation and communication protocols. In this context, the spatial degree of freedom stands out as particularly suited for on-chip integration. But while traditional demonstrations produce and manipulate path-entangled states sequentially with discrete optical elements, continuously-coupled nonlinear waveguide systems offer a promising alternative where photons can be generated and interfere along the entire propagation length, unveiling novel capabilities within a reduced footprint. Here we exploit this concept to implement a compact and reconfigurable source of path-entangled photon pairs based on parametric down-conversion in semiconductor nonlinear waveguides arrays. We use a double-pump configuration to engineer the output quantum state and implement various types of spatial correlations, exploiting a quantum interference effect between the biphoton state generated in each pumped waveguide. This demonstration, at room temperature and telecom wavelength, illustrates the potential of continuously-coupled systems as a promising alternative to discrete multi-component quantum circuits for leveraging the high-dimensional spatial degree of freedom of photons.
References in corpus (31)
- Integrated Photonic Quantum Technologies
- Universal Linear Optics
- Silica-on-Silicon Waveguide Quantum Circuits
- Quantum walks of correlated particles
- Multidimensional quantum entanglement with large-scale integrated optics
- Experimental high-dimensional two-photon entanglement and violations of generalised Bell inequalities
- Advances in High Dimensional Quantum Entanglement
- Realization of quantum walks with negligible decoherence in waveguide lattices
- High-dimensional quantum communication: benefits, progress, and future challenges
- Quantum and classical correlations in waveguide lattices
- High-Dimensional Quantum Key Distribution based on Multicore Fiber using Silicon Photonic Integrated Circuits
- Emergence of criticality through a cascade of delocalization transitions in quasiperiodic chains
- Reentrant Localization Transition in a Quasiperiodic Chain
- Quantum interference of topological states of light
- Gallium Arsenide (GaAs) Quantum Photonic Waveguide Circuits
- Implementation of Quantum and Classical Discrete Fractional Fourier Transforms
- An electrically injected photon-pair source at room temperature
- Spontaneous Parametric Down-Conversion and Quantum Walks in Arrays of Quadratic Nonlinear Waveguides
- A scheme for universal high-dimensional quantum computation with linear optics
- Nonlinear integrated quantum photonics with AlGaAs
- Reconfigurable continuously-coupled 3D photonic circuit for Boson Sampling experiments
- Spatio-spectral characteristics of parametric down-conversion in waveguide arrays
- Biphoton generation in quadratic waveguide arrays: A classical optical simulation
- Quantum Logic with Interacting Bosons in 1D
- Biphoton entanglement of topologically-distinct modes
- Quantum state engineering in arrays of nonlinear waveguides
- A -based AlGaAs Phase Sensitive Amplifier with Record Gain, Noise and Sensitivity
- Quantum logical controlled-NOT gate in a lithium niobate-on-insulator photonic quantum walk
- Quantum walks of correlated photons in non-Hermitian photonic lattices
- Dynamically Reconfigurable Sources for Arbitrary Gaussian States in Integrated Photonics Circuits
- Characterizing high-dimensional quantum contextuality