Conference Agenda

In this presentation, the aluminium oxide integrated photonics platform will be presented, as well as some examples on how it can enable next generation quantum technology.

Modulated free electrons are emerging as powerful tools in quantum science, offering exceptional spatial, spectral, and temporal resolution. Beyond their role as high-precision probes, recent advances have highlighted their potential for quantum control, enabling coherent manipulation of light–matter systems. In this work, we explore how the quantum degrees of freedom of modulated electron wavepackets can be harnessed for both preparation and readout of quantum states in targets ranging from single quantum emitters to hybrid polaritonic systems. For quantum emitters, we show that periodic electron combs induce Rabi-like dynamics without entanglement, preserving state purity. We identify regimes where realistic modulations retain this behavior, enabling robust state preparation, and propose a protocol for full density matrix reconstruction that relies on the electron's coherence. We then extend our analysis to polaritonic targets, revealing how modulated electrons coherently interact with their complex excitation landscape. This enables both spectral probing via techniques like electron-energy-loss and cathodoluminescence spectroscopy, and active quantum control in the strong-coupling regime. These results position modulated electrons as versatile quantum resources for probing and controlling a broad range of light–matter platforms.

Group-IV colour centres in diamond, such as tin-vacancy (SnV) centres, are emerging candidates for quantum technologies [1]. Especially with their inversion-symmetric crystallographic structure, providing excellent optical characteristics [2], resilience to electrical noise, and an efficient spin-photon interface with narrow zero-phonon-line (ZPL) emission [3]. However, ion implantation significantly damages the diamond lattice [4], requiring annealing to restore crystallinity and activate the colour centres [5]. Femtosecond laser annealing is an emerging technique for enhancing the activation yield; however, with ultrashort and high-intensity pulse irradiation, diamond-to-graphite transformation is reported to be more likely under such non-thermal heating mechanisms [8]. Both high-fluence blanket-implanted and single-ion-implanted diamond samples are annealed by laser treatment of unfocused femtosecond laser pulses at 400 and 800 nm wavelengths, 60 fs pulse duration, 1.4 kHz pulse repetition rate, and varying multi-pulse fluence values. Two-dimensional photoluminescence scans, photoluminescence spectrum, Raman spectroscopy, and optically detected magnetic resonance (ODMR) measurements are being used to evaluate activation efficiency. To validate the experimental results, we are also exploring and developing a two-temperature model (TTM) [9] with COMSOL Multiphysics ® to simulate the energy exchange between electron and lattice subsystems isolated under ultrashort pulse irradiation [10].