Pulse and Time‐Resolved Electron Paramagnetic Resonance Techniques for CoherencE Studies of Spin‐based Qubits

The inherent properties of quantum systems, such as superposition and entanglement, offer a new paradigm to the treatment and storage of information in physical systems, enabling potentially faster computation, more secure communication, and better sensors. Electron spins in a range of host environments are ideal systems for representing quantum information. Importantly such systems can be both characterized and controlled through the arsenal of pulse electron paramagnetic resonance techniques. The proposal addressesthe key issues and provides detailed protocols to measure electron‐spin coherence properties in the ground and photoexcited states of molecular and solid‐state spin systems, focusing on their applications as qubits and quantum memories. Based on the UniTO experimental setup and expertise – unique in the national landscape ‐ we aim at elucidating the fundamental mechanisms underlying electron‐spin coherence and its manipulation in different environments. Key objectives include: i) characterizing electron‐spin coherence in ground states, providing insights into the stability and controllability of qubits; ii) investigating electron‐spin coherence in photoexcited states; iii) assessing the impact of environmental factors on electron‐spin coherence, such as temperature, magnetic fields, and material properties. The insights gained will contribute to the implementation of tailored defects and molecules for quantum technologies, which is the main target of Spoke 5.