Integrated high-fidelity preparation and analysis of photonic two-qubit states for quantum network nodes
- URL: http://arxiv.org/abs/2509.15312v1
- Date: Thu, 18 Sep 2025 18:00:47 GMT
- Title: Integrated high-fidelity preparation and analysis of photonic two-qubit states for quantum network nodes
- Authors: Jonas C. J. Zatsch, Tim Engling, Jeldrik Huster, Louis L. Hohmann, Shreya Kumar, Stefanie Barz,
- Abstract summary: Integrated photonics is a promising platform for quantum network nodes.<n>We present a silicon-on-insulator integrated photonic chip, capable of bidirectional operation.
- Score: 0.04104921880358479
- License: http://creativecommons.org/licenses/by/4.0/
- 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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