High-fidelity entangling gates and nonlocal circuits with neutral atoms

• URL: http://arxiv.org/abs/2604.25987v1
• Date: Tue, 28 Apr 2026 18:00:00 GMT
• Title: High-fidelity entangling gates and nonlocal circuits with neutral atoms
• Abstract summary: Two-qubit entangling gates constitute a dominant error source, limiting circuit depths and performance in fault-tolerant architectures.<n>We realize entangling CZ gates with a high Rabi frequency smooth-amplitude pulse, employing state-selective readout and qubit reuse for fast calibration.<n>We then use these low-error gates in quantum circuits with coherent atom rearrangement.
• Score: 29.44867320543274
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Creation and manipulation of entanglement with low error is essential in quantum information systems. In practice, two-qubit entangling gates constitute a dominant error source, limiting circuit depths and performance in fault-tolerant architectures. Using a neutral-atom quantum processor, we realize entangling CZ gates with a high Rabi frequency smooth-amplitude pulse, employing state-selective readout and qubit reuse for fast calibration, and achieve state-of-the-art fidelities of 99.854(4)% which improve to 99.941(3)% upon loss postselection, with stable performance for 10 hours. We then use these low-error gates in quantum circuits with coherent atom rearrangement. We first benchmark performance by creating and disentangling cluster states, and subsequently implement scrambling circuits featuring longer-range connectivity to study non-locally entangled states generated through chaotic dynamics. These results pave the way towards deep-circuit, efficient fault-tolerant quantum computation.

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