Phys.org August 8, 2023 Traditional control of emission from quantum light sources relies on the use of multiple bulky optical elements or nanostructured resonators with limited functionalities, constraining the potential of multi-dimensional tailoring. An international team of researchers (Australia, South Korea) designed an ultrathin polarisation-beam-splitting metalens for the arbitrary structuring of quantum emission at room temperature. Due to the complete and independent polarisation and phase control at the single meta-atom level, the metalens enabled simultaneous mapping of quantum emission from ultra-bright defects in hexagonal boron nitride and imprinting of an arbitrary wavefront onto orthogonal polarisation states of the sources. The […]
Tag Archives: Single photon emitters
Wafer-scale nanofabrication of telecom single-photon emitters in silicon
Phys.org February 23, 2023 Monolithic integration of single-photon sources in a controllable way would give a resource-efficient route to implement millions of photonic qubits in photon integrated circuits. To run quantum computation protocols, these photons must be indistinguishable. Building on their previous work researchers in Germany have shown how focused ion beams from liquid metal alloy ion sources are used to place single-photon emitters at desired positions on the wafer while obtaining a high creation yield and high spectral quality. After several cooling-down and warming-up cycles, there was no degradation of their optical properties. To allow for wafer-scale engineering of […]
Quantum emitters: Beyond crystal clear to single-photon pure
Phys.org September 2, 2021 Quantum dots often suffer from adjacent unwanted emitters, which contribute to the background noise of the QD emission and fundamentally limit the single-photon purity. Researchers in South Korea developed a technique that can isolate the desired quality emitter by reducing the noise surrounding the target with what they have dubbed a ‘nanoscale focus pinspot. The technique is a structurally nondestructive technique under an extremely low dose ion beam and is generally applicable for various platforms to improve their single-photon purity while retaining the integrated photonic structures. Using this technique they focused the ion beam on a […]