# University of Pennsylvania-led team moves a photonic quantum skyrmion onto a two-photon entangled state on a chip

Canonical page: https://technooptimist.io/stories/university-of-pennsylvania-led-team-moves-a-photonic-quantum-skyrmion-d08e679f
Date: 13 Oct 2026
About: [Photonic Inc.](https://technooptimist.io/companies/photonic-inc.md)
Original source: https://quantumcomputingreport.com/university-of-pennsylvania-team-demonstrates-on-chip-photonic-quantum-skyrmion-transfer-in-nature-physics/

A team led by the University of Pennsylvania showed that a quantum skyrmion, a light pattern with a topological count, can be prepared and transferred on a silicon nitride nanophotonic chip. The structure moves from one photon to a shared two-photon entangled state, which the authors propose as a noise-tolerant link for distributed quantum computing. The work appears in Nature Physics.

## Key facts

- Entangled photon pairs are generated by four-wave mixing in 650 nm wide silicon nitride spiral waveguides.
- Spin-orbit-locked microring resonators encode the skyrmion on one photon; an on-chip Bell measurement transfers it to the shared two-photon state.
- The measured skyrmion number is 1.981 ± 0.002 before transfer and 1.981 ± 0.001 after, close to the ideal value of 2.
- Pure-state quantum fidelity is 89% ± 2%.
- The optical-interconnect use is a proposed blueprint, not a demonstrated system; the article does not say whether the noise tests were run on hardware or in simulation.

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