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The Power of Near-Term Quantum Experiments
Logical quantum processor based on reconfigurable atom arrays
Sasha Geim, Harvard University
Monday, September 16, 2024
Abstract: 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 up to 280 physical qubits, 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, outperform physical qubit fidelities, create logical GHZ states, and perform computationally complex scrambling circuits using 48 logical qubits and hundreds of logical gates. Furthermore, we demonstrate how the same architecture can be used for both analog and gate-based quantum simulations, and showcase recent technical upgrades to our platform, including high fidelity arbitrary local single-qubit addressing, site-resolved AC Stark shifts, and on-the-fly decoding and feedforward. Together, these results chart a path toward future large-scale quantum processors and highlight unique near-term opportunities for gate-based quantum simulation. I consent to having my talk recorded Abhinav Deshpande In person [email protected] IBM Almaden Research Center TBA