Séminaire / Seminar – ‘Quantum skyrmions’ i.e. Noise-free Topological Observables of Entangled States – Pedro Ornelas – 18/06/24

10 h 45 min
INSP - Sorbonne Université
Sorbonne Université Campus Pierre et Marie Curie 4 place Jussieu, Paris, 75005
Type d’évènement/Event category

Corridor 22-23 3rd floor, room 317

Pedro Ornelas, PhD student at Structured light laboratory, University of the Witwatersrand – Johannesburg (South Africa)


Entangled states are a promising resource for future quantum technologies such as quantum communication, quantum cryptography and quantum computing, where the approach is to utilize typical entanglement witnesses such as the degree of entanglement and purity as resources for information encoding. However, these features are highly susceptible to noise, thus prompting a search for properties of entangled states that are invariant to realistic noise scenarios. In this talk we will shift our focus to the recently discovered skyrmionic topology of optical systems and propose their existence as a property of a joint non-local system formed by two entangled photons. Furthermore, we will discuss how we can manipulate the non-local topological invariant at will thus revealing the possibility of it being utilized as an information carrier in quantum technologies. Finally, we will discuss the robustness of these topological features by demonstrating their invariance to topical sources of noise and provide an intuitive geometric interpretation to explain the origin of this invariance.

Connected paper:  Ornelas, P., Nape, I., de Mello Koch, R., & Forbes, A. (2024). Non-local skyrmions as topologically resilient quantum entangled states of light. Nature Photonics, 1-9.