High-dimensional Path-Encoded Entanglement Distribution Between Photonic Chips Enabled by Multimode Phase Stabilisation

• URL: http://arxiv.org/abs/2510.15675v2
• Date: Mon, 10 Nov 2025 09:44:16 GMT
• Title: High-dimensional Path-Encoded Entanglement Distribution Between Photonic Chips Enabled by Multimode Phase Stabilisation
• Authors: Molly A. Thomas, Daniel Llewellyn, Patrick W. Yard, Benjamin A. Slater, Caterina Vigliar, Stefano Paesani, Massimo Borghi, Döndü Sahin, John G. Rarity, Leif K. Oxenløwe, Mark G. Thompson, Karsten Rottwitt, Yunhong Ding, Jianwei Wang, Davide Bacco, Jorge Barreto,
• Abstract summary: We demonstrate the distribution of four-dimensional path-encoded entangled quantum states between photonic chips, enabled by a novel multimode phase stabilisation algorithm.<n>We are able to perform complete quantum state tomography across two chips using the minimum number of local projective measurements.
• Score: 1.143088058239088
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The reliable distribution of high-dimensional entangled quantum states, an important resource in quantum technologies, through optical fibre networks is challenging due to the need to maintain coherence across multiple modes. Here we demonstrate the distribution of four-dimensional path-encoded entangled quantum states between photonic chips, enabled by a novel multimode phase stabilisation algorithm. The algorithm utilises the reconfigurability of the integrated photonic circuits to complete one iteration of phase stabilisation in just two measurement rounds for an arbitrary number of modes, and requires no additional hardware to the quantum measurements it enables. As a result, we are able to perform complete quantum state tomography across two chips using the minimum number of local projective measurements to verify the fidelity of the distributed entangled state to be 86% (compared to 8.1% without the phase stabilisation) with an entanglement entropy of 0.995+/-0.002.

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