Sommaire:

Quantum is booming, and established quantum platforms (superconducting circuits, trapped ions, Ry atom arrays and photons) are now moving to the realm of industry (IBM, IONQ, PasQal, and PsiQuantum). A key enabler to some of these approaches is a pristine spin-photon interface that allows entangling long-lived matter-based qubits with routable flying qubits in the form of photons. This talk will introduce you to the key concepts and challenges behind quantum computing and contextualize the sustained research efforts to develop the performance of candidate systems such as trapped ions, atomic impurities in solids and quantum dot spins. The talk will then focus on a specific platform: Optically active semiconductor quantum dots (QDs)--which have unparalleled photonic properties, but also modest spin coherence limited by their resident nuclei--and our most recent work on this platform [1]. In a nutshell, we demonstrated that a new generation of lattice-matched QD devices, with vanishing strain, allows dramatic prolongation of the electron spin coherence over conventional QD counterparts. The near two orders of magnitude improvement of electron spin coherence under dynamical decoupling, also attests of a coherence improvement of the electron-nuclear interface as a whole. We envisage this to enable the storage of quantum information in the nuclear spins, a vital resource towards memory-assisted quantum network protocol.

[1] Leon Zaporski et al., Ideal refocusing of an optically active spin qubit under strong hyperfine interactions, arXiv 2206.01223.

Pour plus d'informations, merci de contacter Finco A.