Randomized Benchmarking Using Nondestructive Readout in a Two-Dimensional Atom Array.

Area of Science:

• Quantum Information Science
• Atomic Physics
• Quantum Computing Hardware

Background:

• Scalable quantum computing requires high-fidelity quantum gates and efficient readout methods.
• Previous demonstrations often involved limited qubit numbers.
• Neutral atom platforms offer a promising route to scalability.

Purpose of the Study:

• To demonstrate high-fidelity single-qubit gates on a large neutral atom array.
• To develop and validate low-loss, nondestructive readout methods for neutral atom qubits.
• To assess the impact of improved readout on gate fidelity.

Main Methods:

• Utilized randomized benchmarking to measure single-qubit gate errors.
• Employed microwave-driven gates on a 225-site neutral atom array.
• Developed and tested low-loss, nondestructive, state-selective readout on a 49-site array.

Main Results:

• Achieved average gate errors of 7(2)×10⁻⁵ on the 225-site array with destructive readout.
• Demonstrated a 1.7-fold reduction in primary measurement errors using nondestructive readout on 49 sites.
• Attained gate errors of 2(9)×10⁻⁴ with the improved readout method.

Conclusions:

• High-fidelity single-qubit gates are achievable in large neutral atom arrays.
• Nondestructive readout significantly suppresses measurement errors, crucial for scalable quantum computing.
• These advancements pave the way for more robust and scalable neutral atom quantum computers.