Generation of modal and path-entangled photons using a domain-engineered integrated optical waveguide device

Abstract

Integrated optical devices are expected to play a promising role in the field of quantum information science and technology. In this paper, we propose a scheme for the generation of nondegenerate, copolarised, modal, and path- entangled photons using a directional coupler and an asymmetric Y-coupler geometry in type 0 phase-matched domain engineered lithium niobate(LN) waveguide. The nonlinearity in LN is tailored in such a way that quasi phase matching conditions for two different spontaneous parametric down conversion processes are obeyed simultaneously, leading to a modal and path-entangled state at the output. Assuming typical values of various parameters, we show, through numerical simulations, that an almost maximally entangled state is achievable over a wide range of waveguide parameters. For the degenerate case, the scheme gives a NOON state for N = 2. The generated entangled photon pairs should have potential applications in quantum information schemes and also in quantum metrology. By appropriate domain engineering and component designing, the idea can be further extended to generate hyperentangled and two-photon multipath-entangled states, which may have further applications in quantum computation protocols.

7 pages, 8 figures

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Cited by in corpus (5)

• Dual-path source engineering in integrated quantum optics
• Remote information concentration and multipartite entanglement in multilevel systems
• Signifying the nonlocality of NOON states using Einstein-Podolsky-Rosen steering inequalities
• Engineering continuous and discrete variable quantum vortex states by nonlocal photon subtraction in a reconfigurable photonic chip
• Direct generation of two-pair frequency entanglement via dual periodic poling in lithium niobate waveguides