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THU: Thursday Contributed Sessions
THU 13: Poster Session: Applications
THU 13.86: Poster
Thursday, September 11, 2025, 16:30–18:30, ZHG Foyer 1. OG
Hardware-efficient GHZ state generation using measurements — S. Siddardha Chelluri1, •Stephan Schuster2, Sumeet Sumeet3, and Riccardo Roma4 — 1Institute of Physics, Johannes-Gutenberg University of Mainz, Staudingerweg 7, 55128 Mainz, Germany — 2Quantum Optics and Quantum Information Group, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstr. 1, 91058 Erlangen, Germany — 3Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany — 4Theoretical Physics, Saarland University, 66123 Saarbrücken, Germany
The application of mid-circuit measurements as non-unitary operations in quantum circuits is a promising approach for more efficient state preparation and long-range entangling gates. Combined with conditional feedforward operations, such dynamic circuits can, for example, overcome the efficiency constraints on the generation of entangled states that are imposed by unitary operations alone. In this work, we propose a new algorithm incorporating mid-circuit measurements for the preparation of Greenberger-Horne-Zeilinger (GHZ) states on quantum devices with limited qubit connectivity. Our algorithm leverages the two-dimensional qubit layout of the device to generate low-depth circuits for preparing the desired GHZ states. We additionally benchmark our algorithm on different connectivity layouts, including the latest IBM Heron R2 architecture, and compare it to a purely unitary method based on a breadth-first search of the layout graph.
Keywords: Quantum computing; GHZ state; Measurement-based quantum computation; Quantum hardware; Entanglement