Beyond Beam Splitters: Efficiently Decomposing Large Unitaries into Multimode Devices of Arbitrary Size
Christian Arends, Lasse L. Wolf, Jasmin D. A. Meinecke, Sonja Barkhofen, Tobias Weich, Tim J. Bartley · Quantum 2.0 Conference and Exhibition · 2024
Linear optical quantum computing and simulation typically relies on decomposing large unitaries into many 2x2 subunitaries comprising beam splitters and phase shifters. We provide a rigorous decomposition into larger subunitaries, which offer significant scaling improvements.