Speaker
Description
Quantum communication allows the provably secure distribution of cryptographic keys, and the teleportation of quantum states between distant particles. Applications of these two key concepts of quantum information processing generally require sender and receiver to be at distant locations.
I will discuss our recent advances in quantum key distribution (QKD) and quantum teleportation using the City of Calgary’s standard fibre network. More precisely, I will comment on our work towards the implementation of so-called measurement-device-independent QKD [1,2] – a recently proposed QKD protocol that is immune to side-channel attacks that exploit vulnerabilities of single-photon detectors – in a star-type network topology. Furthermore, I will discuss quantum teleportation from a photon, interacting with another photon after both have travelled several kilometres over deployed fibre and over a combined beeline distance of 8.2 km, onto a third photon 6.2 km away [3]. Both investigations constitute important steps on the path towards a large scale quantum communication network, and ultimately a quantum computer network.
[1] H.-K. Lo, M. Curty and B. Qi, Measurement-Device-Independent quantum key distribution, Phys. Rev. Lett. 108, 130503 (2012) .
[2] A. Rubenok et al., Real-World two-photon interference and proof-of-principle quantum key distribution immune to detector attacks, Phys. Rev. Lett. 111, 130501 (2013).
[3] R. Valivarthi et al., Quantum teleportation across a metropolitan fibre network, Nature Photonics 10, 676–680 (2016).
