Spin+Quantum sensing: Diagnosing nonclassical magnon states via NV center qubits and phonons (A13#)

• Subject Area: Theoretical Condensed Matter Physics ; Physical Chemistry of Solids and Surfaces, Material Characterisation
• Term: since 2025
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 268565370

We will develop the density matrix-based theoretical framework to describe magnonic modes coupled with external high-coherence systems acting as quantum sensors. Two different kinds of sensors will be considered - (i) an NV center qubit and (ii) a phonon mode. We will formulate the quantum master equation for the sensing subsystem that takes into account its interactions with the magnonic subsystem to be sensed. In this manner, a unified classical-quantum treatment for the total system will be obtained predicting concrete experimental protocols for sensing the nonclassical features, such as quantum entanglement, in magnons.

• DFG Programme: CRC/Transregios
• Subproject of: TRR 173: Spin+X: Spin in its collective environment
• International Connection: Spain
• Applicant Institution: Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau
• Project Head: Professor Dr. Akashdeep Kamra, since 6/2024