Logical quantum processor based on reconfigurable atom arrays*

Suppressing errors is one of the central challenges for useful quantum computing, requiring quantum error correction for large-scale processing. Here we present recent advances in quantum information processing using dynamically reconfigurable arrays of neutral atoms, where physical qubits are encoded in long-lived hyperfine states and entangling operations are realized by coherent excitation into Rydberg states. With this platform we realize a programmable logical quantum processor, utilizing high two-qubit gate fidelities, arbitrary connectivity, and mid-circuit readout. By encoding logical qubits with various types of error-correcting codes, we demonstrate improved logical two-qubit gates upon increasing the code size, remove entropy via stabilizer measurement, create logical entangled states, and perform computationally complex scrambling circuits. Furthermore, we showcase recent technical upgrades to our platform which enable atomic qubits to be re-used mid-computation, including loss-resolved non-destructive readout, on-the-fly decoding, and local mid-circuit cooling and reinitialization. Together, these results chart a path toward future large-scale quantum information processing and gate-based quantum simulation.