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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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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.
Nature
|October 11, 2023
Summary
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.
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.
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