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Updated: Apr 6, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
Spatially Resolved Detection of a Spin-Entanglement Wave in a Bose-Hubbard Chain
Takeshi Fukuhara1,2, Sebastian Hild1, Johannes Zeiher1
1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
Abstract:
Entanglement is an essential property of quantum many-body systems. However, its local detection is challenging and was so far limited to spin degrees of freedom in ion chains. Here we measure entanglement between the spins of atoms located on two lattice sites in a one-dimensional Bose-Hubbard chain which features both local spin- and particle-number fluctuations. Starting with an initially localized spin impurity, we observe an outwards propagating entanglement wave and show quantitatively how entanglement in the spin sector rapidly decreases with increasing particle-number fluctuations in the chain.
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