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Logical quantum processor based on reconfigurable atom arrays



Dolev Bluvstein, Simon Evered, Alexandra Geim, Sophie Li, Hengyun Zhou, Tom Manovitz, Sepehr Ebadi, Madelyn Cain, Marcin Kalinowski, Dominik Hangleiter, J. Pablo Bonilla Ataides, Nishad Maskara, Iris Cong, Xun Gao, Pedro Rodriguez, Thomas Karolyshyn, Giulia Semeghini, Michael Gullans, Markus Greiner, Vladan Vuletic, Mikahil Lukin


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


Quantum computing, quantum error correction, quantum algorithms, neutral atom arrays


Bluvstein, D. , Evered, S. , Geim, A. , Li, S. , Zhou, H. , Manovitz, T. , Ebadi, S. , Cain, M. , Kalinowski, M. , Hangleiter, D. , Ataides, J. , Maskara, N. , Cong, I. , Gao, X. , Rodriguez, P. , Karolyshyn, T. , Semeghini, G. , Gullans, M. , Greiner, M. , Vuletic, V. and Lukin, M. (2023), Logical quantum processor based on reconfigurable atom arrays, Nature, [online],, (Accessed February 24, 2024)
Created December 6, 2023, Updated February 5, 2024