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

• URL: http://arxiv.org/abs/2307.06116v1
• Date: Wed, 12 Jul 2023 12:15:13 GMT
• Title: Scalable generation and detection of on-demand W states in nanophotonic circuits
• Authors: Jun Gao, Leonardo Santos, Govind Krishna, Ze-Sheng Xu, Adrian Iovan, Stephan Steinhauer, Otfried G\"uhne, Philip J. Poole, Dan Dalacu, Val Zwiller, Ali W. Elshaari
• Abstract summary: 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. 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.
• Score: 4.495431203748202
• License: http://creativecommons.org/licenses/by/4.0/
• 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.

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