Logical quantum processor based on reconfigurable atom arrays

• DOI: 10.48550/arxiv.2312.03982
• Publication Date: 2023-01-01
• Authors: Dolev Bluvstein; Simon J. Evered; Alexandra A. Geim; Sophie H. Li; Hengyun Zhou; Tom Manovitz; Sepehr Ebadi; Madelyn Cain; M. W. Kalinowski; Dominik Hangleiter; J. Pablo Bonilla ...; Nishad Maskara; Iris Cong; Xun Gao; Pedro Sales Rodri...; Thomas Karolyshyn; Giulia Semeghini; Michael J. Gullans; Markus Greiner; Vladan Vuletić; Mikhail D. Lukin
• Keywords: Quantum Physics; Multidisciplinary; Quantum Gases (cond-mat.quant-gas); Atomic Physics (physics.atom-ph); FOS: Physical sciences; Condensed Matter - Quantum Gases; Quantum Physics (quant-ph); Article; 620; Physics - Atomic Physics

Suppressing errors is the central challenge for useful quantum computing, requiring error correction large-scale processing. However, overhead in realization of error-corrected ``logical'' qubits, where information encoded across many physical qubits redundancy, poses significant challenges to logical computing. Here we report a programmable processor based on operating with up 280 qubits. Utilizing logical-level control and zoned architecture reconfigurable neutral atom arrays, our system combines high two-qubit gate fidelities, arbitrary connectivity, as well fully single-qubit rotations mid-circuit readout. Operating this various types encodings, demonstrate improvement logic by scaling surface code distance from d=3 d=7, preparation color break-even fault-tolerant creation GHZ states feedforward entanglement teleportation, operation 40 Finally, using three-dimensional [[8,3,2]] blocks, realize computationally complex sampling circuits 48 entangled hypercube connectivity 228 gates CCZ gates. We find that encoding substantially improves algorithmic performance detection, outperforming qubit fidelities at both cross-entropy benchmarking simulations fast scrambling. These results herald advent early computation chart path toward processors.