Scalable generation and detection of on-demand W states in nanophotonic circuits

Abstract

Quantum physics phenomena, entanglement and coherence, are crucial for quantum information protocols, but understanding these in systems with more than two parts is challenging due to increasing complexity. The W state, a multipartite entangled state, is notable for its robustness and benefits in quantum communication. Here, we generate an 8-mode on-demand single photon W states, using nanowire quantum dots and a silicon nitride photonic chip. We demonstrate a reliable, scalable technique for reconstructing W-state in photonic circuits using Fourier and real-space imaging, supported by the Gerchberg-Saxton phase retrieval algorithm. Additionally, we utilize an entanglement witness to distinguish between mixed and entangled states, thereby affirming the entangled nature of our generated state. The study provides a new imaging approach of assessing multipartite entanglement in W-states, paving the way for further progress in image processing and Fourier-space analysis techniques for complex quantum systems.

References in corpus (6)

• Entanglement detection
• Scalable multi-particle entanglement of trapped ions
• Decoherence Effects on the Non-locality of Symmetric States
• Nonlocality of $W$ and Dicke states subject to losses
• Optimal interferometry for Bell$-$nonclassicality by a vacuum$-$one$-$photon qubit
• Single photon generation and non-locality of perfect W-state

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• Verification of single-photon path entanglement using a nitrogen vacancy center
• Adding Photonic Entanglement to Superradiance by Using Multilevel Atoms
• Entanglement dynamics in minimal Kitaev chains