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Parallel Implementation of High-Fidelity Multiqubit Gates with Neutral Atoms
Harry Levine1, Alexander Keesling1, Giulia Semeghini1
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Physical Review Letters
|November 9, 2019
Summary
Researchers demonstrate high-fidelity universal two- and three-qubit entangling gates using neutral-atom qubits and Rydberg interactions. This work advances scalable quantum information processing platforms.
Area of Science:
- Quantum computing
- Atomic physics
- Quantum information science
Background:
- Neutral-atom qubits offer a promising scalable platform for quantum computation.
- Long-lived hyperfine ground states provide robust qubit encoding.
- Rydberg interactions enable strong, controllable qubit coupling.
Purpose of the Study:
- To implement universal two- and three-qubit entangling gates on neutral-atom qubits.
- To demonstrate high-fidelity gate operations using Rydberg states.
- To assess the potential for scalable quantum information processing.
Main Methods:
- Utilizing neutral atoms trapped in optical tweezers arranged in a 1D array.
- Employing excitation to Rydberg states for mediating entangling gates.
- Implementing a novel, fast global coupling protocol for the controlled-phase gate.
Main Results:
- Achieved high fidelity for two-qubit controlled-phase gates (F≥95.0(2)%) and extracted gate fidelity (≥97.4(3)%).
- Demonstrated a proof-of-principle three-qubit Toffoli gate.
- Parallel gate operations were performed on multiple atom clusters.
Conclusions:
- The implemented gates are key components for building scalable quantum computers.
- High-fidelity operations in neutral-atom systems pave the way for advanced quantum information processing.
- This work validates neutral-atom platforms for robust quantum computation.
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