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A: Fachverband Atomphysik
A 1: Ultracold Matter I – Fermions (joint session Q/A)
A 1.5: Vortrag
Montag, 2. März 2026, 12:45–13:00, P 2
Probing Choi superconductivity in a fermionic quantum simulator — •Marnix Barendregt1,2, Si Wang1,2, Petar Bojovic1,2, Johannes Obermeyer1,2, Dorothee Tell1,2, Immanuel Bloch1,2,3, and Titus Franz1,2 — 1Max Planck Institute of Quantum Optics, Garching, Germany — 2Munich Center for Quantum Science and Technology, Munich, Germany — 3Ludwig Maximilian University of Munich, Munich, Germany
Ultracold fermionic atoms in optical lattices have become a powerful platform for exploring the Fermi-Hubbard model with site-resolved resolution. Many strongly correlated phases exhibit spontaneous strong-to-weak symmetry breaking, but detecting this experimentally is challenging because its signature depends quadratically on the system's density matrix, requiring two identical copies of the state. Here, we introduce an alternative approach based on the Choi doubled Hilbert space representation, where the second copy is generated numerically on a classical computer. In this framework, the Rényi-2 correlator maps onto a superconducting pairing correlator. We probe this "Choi superconductivity" by measuring site-resolved occupation numbers in a lithium-6 quantum gas microscope. These measurements open new avenues for using quantum gas microscopes to identify strongly correlated phases such as Dirac spin liquids and 1+1D conformal field-theory states.
Keywords: Fermi-Hubbard model; Quantum simulation; Superconductivity