Title: Quantum State Generation and Measurement of Magnons
When: Friday, March 6, 2026, 12:00
Place: Department of Theoretical Condensed Matter Physics, Faculty of Sciences, Module 5, Seminar Room (5th Floor)
Speaker: Sanchar Sharma – la Caixa Junior Leader, Universidad Autónoma de Madrid
Magnons have recently emerged as promising candidates for quantum technologies, including sensing and transduction. Developing these applications requires quantum-coherent methods for probing magnons. In this talk, I will discuss our theoretical works concerning the measurement and generation of quantum states in magnons.
Tomography: Brillouin light scattering (BLS) is a well-established classical technique for probing magnons known for its high sensitivity and temporal resolution. We explore the efficacy of BLS for quantum tomography of magnons. We find that in the state-of-the-art setups, it is feasible to reconstruct the ‘classical component’ of magnons, i.e. the regions of positive Wigner function. I will also discuss techniques to overcome this limitation to achieve a faithful quantum tomography.
State Generation: Magnets can be scaled down to the nanoscale without losing coherence, making them interesting candidates for integrated bosonic qubits. Recently, we proposed and numerically evaluated a protocol for an arbitrary state generation in magnons. With this protocol, states up to 8-9 magnons can be generated in state-of-the-art setups.
