Środowiskowe Seminarium z Informacji i Technologii Kwantowych

Recent advances in quantum technologies are paving the way for unprecedented levels of security in communication networks, grounded in the laws of quantum mechanics. At the forefront of these developments is quantum key distribution (QKD), a protocol enabling secure private communication, and has already demonstrated key exchanges over hundreds of kilometers using photonic entanglement. The scope of quantum communications now extends far beyond secure key exchange, with new protocols emerging to address a wide array of cryptographic and networking tasks. In this talk, we will focus on two such protocols and their first experimental realizations in the laboratory: quantum weak coin-flipping [1] and the secure transmission of quantum information through an untrusted channel [2]. Both protocols leverage photonic entanglement to enforce security and enable functionalities considered out of reach with classical resources alone. We will present the experimental demonstrations of the building blocks of future quantum networks, and explore key features enabled by entanglement verification, including cheat-sensitivity and device-independence.

[1] S. Neves, et al. "Experimental cheat-sensitive quantum weak coin flipping." Nature Communications 14.1 (2023): 1855.

[2] S. Neves, et al. "Experimentally Certified Transmission of a Quantum Message through an Untrusted and Lossy Quantum Channel via Bell's Theorem." Phys. Rev. X Quantum (2025, in production)