# A manufacturable platform for photonic quantum computing

“A manufacturable platform for photonic quantum computing” (2025), by PsiQuantum team et al. Engineering research paper. Original abstract below, unchanged. A free PDF is available.

- Authors: PsiQuantum team, Koen Alexander, Avishai Benyamini, Dylan S. Black, Damien Bonneau, Stanley P. Burgos, Ben M. Burridge, Hugo V. Cable, Geoff Campbell, Gabriel Catalano et al.
- Published: February 26, 2025
- Field: Engineering
- DOI: https://doi.org/10.1038/s41586-025-08820-7
- Free PDF: https://arxiv.org/pdf/2404.17570

## Abstract

Although holding great promise for low noise, ease of operation and networking 1 , useful photonic quantum computing has been precluded by the need for beyond-state-of-the-art components, manufactured by the millions 2–6 . Here we introduce a manufacturable platform 7 for quantum computing with photons. We benchmark a set of monolithically integrated silicon-photonics-based modules to generate, manipulate, network and detect heralded photonic qubits, demonstrating dual-rail photonic qubits with 99.98% ± 0.01% state preparation and measurement fidelity, Hong–Ou–Mandel (HOM) quantum interference between independent photon sources with 99.50% ± 0.25% visibility, two-qubit fusion with 99.22% ± 0.12% fidelity and a chip-to-chip qubit interconnect with 99.72% ± 0.04% fidelity, conditional on photon detection and not accounting for loss. We preview a selection of next-generation technologies: low-loss silicon nitride (SiN) waveguides and components to address loss, as well as fabrication-tolerant photon sources, high-efficiency photon-number-resolving detectors (PNRDs), low-loss chip-to-fibre coupling and barium titanate (BTO) electro-optic phase shifters for high-performance fast switching.

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