Nuclear Quantum Entangled States Sensors

The NuQuESTS project (Nuclear Quantum Entangled States Sensors) is a groundbreaking initiative advancing quantum technologies using unique properties of noble gas nuclear spins. Coordinated by Devang Naik, the project is a collaboration between the University of Innsbruck (UIBK) and Sorbonne`s Laboratoire Kastler Brossel (LKB). It focuses on creating long-lived quantum states, miniaturized quantum devices, and innovative cooling techniques, all with the potential to revolutionize quantum sensing, communication, and metrology. At the heart of NuQuESTS is the use of noble gas atoms, as 129Xe, whose nuclear spins are naturally shielded by their closed electronic shells. This allows quantum states to be preserved for hours or even days at room temperature, overcoming the limitations of traditional cryogenic systems or ultra- high vacuum setups. The project aims to develop a nuclear quantum optics platform using hollow- core photonic crystal fibers (HCPCF), which replace bulky laboratory setups with compact, portable devices. These fibers will enable precise manipulation and storage of quantum states, paving the way for applications in quantum communication, magnetometry, medical imaging, and fundamental physics experiments. The University of Innsbruck plays a pivotal role in the theoretical foundation and computational modeling. Under the leadership of Prof. Helmut Ritsch, UIBK is responsible for the theoretical modeling of exciplex potentials and collision dynamics. These exciplex molecules, formed by alkali atoms like 87Rb and noble gas atoms like 129Xe, are central to the project. Coupling colliding ground-state atoms with bound states in the exciplex manifold enables a six-order-of-magnitude improvement in spin-transfer cross-sections by efficient quantum state manipulation. UIBK also contributes to design and optimization of the nuclear quantum optics platform. This includes simulating laser absorption, fluorescence, and spin transfer dynamics within the HCPCF fibers. Experts like Laurin Ostermann and Milan Onck explore the creation of long-lived nuclear spin ensembles and entangled states. These efforts are crucial for developing portable, all-fiber quantum devices that can operate in real-world conditions. The Innsbruck team brings expertise in theoretical quantum optics, and molecular dynamics which is complemented by LKB`s experimental capabilities, creating a synergy that drives innovation. This ensures the project`s success in bridging the gap between theory and practical applications. NuQuESTS emphasizes knowledge transfer and outreach aiming to inspire the next generation of researchers. In summary, NuQuESTS represents a bold step forward in quantum technology, combining theoretical excellence with experimental innovation to harness the unique properties of noble gas nuclear spins to create quantum devices that are not only powerful but also practical and accessible, opening new frontiers in science and technology.