Dresden 2026 – wissenschaftliches Programm

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QI: Fachverband Quanteninformation

QI 16: Quantum Software

QI 16.10: Vortrag

Donnerstag, 12. März 2026, 12:30–12:45, BEY/0245

Detecting genuine multipartite entanglement in multi-qubit devices with restricted measurements — •Nicky Kai Hong Li^1,2, Xi Dai^3,4, Manuel Muñoz-Arias⁵, Kevin Reuer^3,4, Marcus Huber^1,2, and Nicolai Friis¹ — ¹Atominstitut, Technische Universität Wien, Stadionallee 2, 1020 Vienna, Austria — ²Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences, Boltzmanngasse 3, 1090 Vienna, Austria — ³Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland — ⁴Quantum Center, ETH Zurich, CH-8093 Zurich, Switzerland — ⁵Institut Quantique and Département de Physique, Université de Sherbrooke, Sherbrooke J1K 2R1 QC, Canada

Detecting genuine multipartite entanglement (GME) is a state-characterization task that benchmarks coherence and experimental control in quantum systems. Existing GME tests often require joint measurements on many qubits, posing experimental challenges for systems like time-bin qubits and microwave photons from superconducting circuits. Here we introduce GME and k-inseparability criteria applicable to any state, which only require measuring O(n²) out of 2ⁿ m-body stabilizers of n-qubit target graph states, with m at most twice the graph’s maximum degree. For cluster or ring-graph states, only constant-weight stabilizers are needed. Using SDP, we further reduce both the number and weight of required stabilizers. Analytical and numerical results show that our criteria are noise-robust and can infer state infidelity from certified k-inseparability in microwave photonic graph states generated under realistic conditions.

Keywords: Entanglement theory; Multipartite entanglement; Entanglement certification; Microwave photonic graph states; Superconducting qubits