Fault-Tolerant Quantum Computation with Static Linear Optics

The scalability of photonic implementations fault-tolerant quantum computing based on Gottesman-Kitaev-Preskill (GKP) qubits is injured by the requirements inline squeezing and reconfigurability linear optical network. In this work we propose a topologically error-corrected architecture that does away with these elements at no cost—in fact, an advantage—to state preparation overheads. Our computer consists three modules: two-dimensional (2D) array probabilistic sources GKP states; depth-four circuit static beam splitters, phase shifters, short delay lines; 2D homodyne detectors. symmetry our proposed allows us to combine effects finite uniform photon loss within noise model, resulting in more comprehensive threshold estimates. These jumps over both architectural analytical hurdles considerably expedite construction computer.Received 9 April 2021Accepted 15 November 2021DOI:https://doi.org/10.1103/PRXQuantum.2.040353Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasMeasurement-based computingOptical information processingQuantum computationQuantum architectures & platformsQuantum processing continuous variablesTopological computingQuantum Information