Abstract
In this talk, we will discuss 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. A central challenge for useful quantum computing is achieving sufficiently low errors rates, therefore requiring quantum error correction for large-scale processing. Here 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.
*DOE Quantum Systems Accelerator Center, DARPA ONISQ program, DARPA IMPAQT program, DARPA MeasQuIT program, Center for Ultracold Atoms (an NSF Physics Frontiers Center), the National Science Foundation, IARPA and the Army Research Office under the Entangled Logical Qubits program, Wellcome Leap Foundation under the Quantum for Bio program, QuEra Computing, the National Defense Science and Engineering Graduate (NDSEG) fellowship, the Harvard Quantum Initiative Postdoctoral Fellowship in Science and Engineering, the Banting Postdoctoral Fellowship, the Fannie and John Hertz Foundation, the Department of Energy Computational Science Graduate Fellowship.
