Generation of photon pairs in topologically protected guided modes

Bergamasco, Nicola; Liscidini, Marco

doi:10.1103/physreva.100.053827

Cited by 7 publications

(1 citation statement)

References 22 publications

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“…Several studies have evidenced the role that nonlinearities can play in modifying the topological properties of a system, where nonlinear interactions can enable twophoton edge states in systems that are otherwise topologically trivial in the linear regime [17][18][19]. Other recent theoretical works have shown that topological protection of multiphoton entangled states can deteriorate more quickly than that of their classical or single-photon counterparts [20,21]. In all the above cases, the photonic quantum states populate modes of the same topology.…”

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confidence: 99%

Biphoton entanglement of topologically-distinct modes

Doyle,

Zhang,

Wang

et al. 2022

Preprint

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The robust generation and manipulation of entangled multiphoton states on-chip has an essential role in quantum computation and communication. Lattice topology has emerged as a means of protecting photonic states from disorder but entanglement across different topologies remained unexplored. We report biphoton entanglement between topologically distinct spatial modes in a bipartite array of silicon waveguides. The results highlight topology as an additional degree of freedom for entanglement and open avenues for investigating information teleportation between trivial and topological modes.

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confidence: 99%

Biphoton entanglement of topologically-distinct modes

Doyle,

Zhang,

Wang

et al. 2022

Preprint

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Biphoton entanglement of topologically distinct modes

et al. 2022

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Tunable Generation of Spatial Entanglement in Nonlinear Waveguide Arrays

Raymond,

Zecchetto,

Palomo

et al. 2024

Phys. Rev. Lett.

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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 waveguide 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 multicomponent quantum circuits for leveraging the high-dimensional spatial degree of freedom of photons. Published by the American Physical Society 2024

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Generation of photon pairs in topologically protected guided modes

Cited by 7 publications

References 22 publications

Biphoton entanglement of topologically-distinct modes

Biphoton entanglement of topologically-distinct modes

Biphoton entanglement of topologically distinct modes

Tunable Generation of Spatial Entanglement in Nonlinear Waveguide Arrays

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