Seminarium Fizyki Politechniki Wrocławskiej
PWr, bud. A1, sala 322
Quantum dots: from quantum computing to quantum communication
dr Dario Fioretto
Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies
The recent progress made on quantum dot (QD) single-photon sources has opened up the possibility of using these devices for various applications such as quantum computing and communications. High brightness and single-photon purity are the key parameters to deploy secure quantum communication like Quantum Key Distribution (QKD) while high indistinguishability and the capability to generate entanglement with them paves the road towards scalable and fault-tolerant quantum computing.
In this seminar I will explore both venues. In the first half, I will discuss how we generate cluster states by exploiting the precession dynamics of a single electron confined within a semiconductor quantum dot. I will also show how to access a wider class of graph states (defined caterpillar states) with more complex sequences.
In the second half, I will show the recent results on proof-of-concept experiments for quantum key distribution based on these single-photon sources. I will show how in our setup we measure the secret key rate distance scaling for quantum dots and laser and how this allowed us to explore an intermediate regime of mixing of the two.
