Integrated high-fidelity preparation and analysis of photonic two-qubit states for quantum network nodes

Jonas C. J. Zatsch; Tim Engling; Jeldrik Huster; Louis L. Hohmann; Shreya Kumar; Stefanie Barz

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arXiv · 2509.15312

Integrated high-fidelity preparation and analysis of photonic two-qubit states for quantum network nodes

Jonas C. J. Zatsch·Tim Engling·Jeldrik Huster·Louis L. Hohmann·Shreya Kumar·Stefanie Barz

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Abstract

The realisation of quantum networks requires local quantum information processing at the network nodes and highly efficient transmission of quantum information across the network. Integrated photonics, based on silicon-on-insulator, is a promising platform for quantum network nodes, as it supports low-loss propagation of telecom wavelength photons, making it compatible with existing optical fibre networks. Here, we present a silicon-on-insulator integrated photonic chip, capable of bidirectional operation, enabling the preparation of arbitrary single- and two-qubit states, and performing full quantum state tomography on up to two qubits. Using our chip, we obtain preparation fidelities above 97% for on-chip prepared Bell states coupled into optical fibres. Furthermore, we demonstrate that we can distribute entanglement between network nodes by preparing a two-qubit cluster state on the first node and performing full quantum state tomography on the second node, achieving a fidelity of 90.0(16)%. This result proves that our approach allows the distribution of entanglement from one chip to another. The potential of bidirectional operation makes our circuit a versatile node in telecom quantum networks, both functioning as a sender and receiver unit, a key element for the deployment of fully photonic multi-purpose quantum networks.

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Jonas C. J. Zatsch, Tim Engling, Jeldrik Huster, Louis L. Hohmann, Shreya Kumar, Stefanie Barz. 2025-09-18. Integrated high-fidelity preparation and analysis of photonic two-qubit states for quantum network nodes. https://arxiv.org/abs/2509.15312

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