Low-rank Hessian optimization enables rapid closed-loop calibration of optimal-control gates, demonstrated on an amplitude-robust CZ gate on 171Yb qubits reaching 0.99902(7) fidelity after postselection.
Logical qubits with erasure conversion using metastable neutral atoms
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abstract
Implementing large-scale quantum algorithms with practical advantage will require fault-tolerance achieved through quantum error correction, but the associated overhead is prohibitive. This overhead can be reduced by engineering physical qubits with fewer errors, and by shaping the residual errors to be more easily correctable. In this work, we demonstrate quantum error correcting codes and logical qubit circuits in a metastable ytterbium-171 nuclear spin qubit with a noise bias towards erasure errors. These errors can be located separately from any syndrome information diagnosing the error, and we demonstrate adaptive circuit execution based on erasure information. We show that dephasing errors on the qubit during coherent transport can be strongly suppressed, and implement entangling gates that maintain a high fidelity in the presence of gate beam inhomogeneity or pointing errors. Furthermore, we demonstrate logical qubit encoding in the [[4, 2, 2]] code, with error correction during decoding based on mid-circuit erasure measurements despite the fact that the code is too small to correct any Pauli errors. Finally, we demonstrate logical qubit teleportation between multiple code blocks with conditionally selected ancillas based on mid-circuit erasure checks, a key part of leakage-robust error correction schemes using neutral atoms.
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Neutral atom platform achieves repeated toric code syndrome extraction with qubit reloading, preserving logical information over 90 cycles and showing distance-dependent logical error suppression.
Demonstrates intra-tweezer Rydberg blockade for microsecond-scale single-atom preparation in 171Yb, reducing multi-atom probability to 1% in 64.8 μs with 58% retention or 75% filling fraction.
Transmon qutrits serve as erasure qubits achieving logical T1 over 500 μs with mid-circuit detection, ten times the physical qubit lifetime, plus low-error gates and heralded Bell states.
Proposes dual ³P₀/³P₂ metastable encoding in ¹⁷¹Yb atoms to separate storage and fast-operation qubits with coherent shelving for single-species fault-tolerant neutral-atom quantum computing.
A modular atomic processor with 500,000 qubits factors 2048-bit RSA numbers in roughly the same time as a single large module when inter-module Bell-pair communication runs at 10^5 per second.
Neutral-atom system delivers state-of-the-art CZ gate fidelity of 99.854% (99.941% postselected) and demonstrates coherent rearrangement for nonlocal quantum circuits.
Loss biasing turns Rydberg errors into erasures in neutral-atom QEC, restoring fault-tolerant Pauli error scaling and enabling optimal erasure scaling with loss-aware decoding for shorter cycles.
Neutral-atom processor integrates atom motion with in-place entanglement to cut logical overhead, shown in Shor's variant, CX ladders, and [[16,4,4]] code experiments with 2-8x error improvements.