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QI: Fachverband Quanteninformation

QI 7: Quantum Thermodynamics

QI 7.5: Vortrag

Dienstag, 10. März 2026, 10:30–10:45, BEY/0E17

Symmetry-Aware Cooling Protocols for High-Fidelity Initialization of Many-Body Spin Networks — •Durga Dasari¹, Saikat Sur², and Gershon Kurizki³ — ¹3. Physics Institute, University of Stuttgart, Stuttgart, GERMANY — ²Institute of Mathematical Sciences, Chennai, India — ³Weizmann Institute of Science, Israel

Interacting quantum spin networks are central to many-body quantum simulations, sensing, and quantum computation, all of which demand a highly polarized initial state. However, cooling such networks to their ground state is impeded by interaction-induced correlations and symmetry-protected subspaces. Resetting a mixed many-body state to the computational-zero state thus remains an open challenge. We present a universal cooling strategy that couples the network collectively to an ancilla spin that periodically dumps entropy into an ultracold bath. Using graph-theoretic analysis of the network*capturing connectivity, symmetry sectors, and correlation flow*we bypass the intractability of full quantum dynamics. This analysis reveals a unique coherent control sequence that deliberately breaks graph-imposed symmetry constraints and unlocks otherwise inaccessible cooling pathways. The resulting protocol provides a general and experimentally realistic route to high-fidelity purification of complex spin networks.

Keywords: Interacting spin networks; Quantum contol and Thermodynamics; Spin polarization; Solid state spin defects; Graph theory