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The Quantum-Mechanical Model of an Atom

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Published on: September 5, 2019

High-fidelity parallel entangling gates on a neutral-atom quantum computer.

Simon J Evered¹, Dolev Bluvstein¹, Marcin Kalinowski¹

¹Department of Physics, Harvard University, Cambridge, MA, USA.

|October 11, 2023

Summary

This summary is machine-generated.

Researchers achieved 99.5% fidelity for two-qubit entangling gates in neutral-atom quantum computing, a critical step for scalable quantum information processing and error correction.

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Area of Science:

Quantum Information Science
Atomic Physics
Quantum Computing

Background:

Scalable, low-error quantum operations are essential for quantum information processing.
Neutral-atom arrays offer a promising platform with high qubit counts and reconfigurable connectivity.
Reducing errors in entangling gates mediated by Rydberg interactions remains a key challenge.

Purpose of the Study:

To realize high-fidelity two-qubit entangling gates in neutral-atom arrays.
To surpass the error correction threshold using these gates.
To demonstrate the scalability and applicability of the method for multi-qubit gates.

Main Methods:

Utilized fast, single-pulse gates optimized via optimal control.
Employed atomic dark states to minimize scattering errors.
Improved Rydberg excitation and atom cooling techniques.
Performed parallel gate operations on up to 60 atoms.

Main Results:

Achieved 99.5% fidelity for two-qubit entangling gates.
Demonstrated parallel gate operations on 60 atoms, exceeding the surface-code threshold.
Successfully realized low-error three-qubit gates.
Characterized physical error sources and validated fidelity through repeated gate applications.

Conclusions:

Developed a method for high-fidelity entangling gates in neutral-atom systems.
The achieved fidelity paves the way for scalable quantum computing and error correction.
The technique is generalizable to multi-qubit gates, enabling complex quantum algorithms and simulations.