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Related Experiment Video

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

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Published on: November 1, 2013

Demonstration of a neutral atom controlled-NOT quantum gate.

L Isenhower¹, E Urban, X L Zhang

¹Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, Wisconsin 53706 USA.

Physical Review Letters

|April 7, 2010

Summary

Researchers demonstrated the first controlled-NOT (CNOT) gate using two neutral atoms. This quantum computing advancement utilizes Rydberg blockade interactions for high-fidelity quantum operations.

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Area of Science:

Quantum computing
Atomic physics
Quantum information science

Background:

Neutral atoms are promising qubits for quantum computing.
Rydberg blockade enables strong interactions between neutral atoms.
Implementing controlled quantum gates is crucial for scalable quantum computers.

Purpose of the Study:

To demonstrate the first controlled-NOT (CNOT) gate between two individually addressed neutral atoms.
To investigate the fidelity of the CNOT gate using Rydberg blockade interactions.
To generate entangled Bell states using the implemented CNOT gate.

Main Methods:

Utilizing neutral atoms trapped in optical lattices.
Implementing the CNOT gate via Rydberg blockade interactions between atoms separated by >8 microm.
Employing two distinct gate protocols to measure CNOT fidelity.
Generating Bell states and measuring their fidelity.

Main Results:

Achieved CNOT fidelities of 0.73 and 0.72 using two protocols.
Generated Bell states with a fidelity of 0.48 +/- 0.06.
Obtained an a posteriori entanglement fidelity of 0.58 after correcting for atom loss.

Conclusions:

The first demonstration of a neutral-atom CNOT gate was successful.
Rydberg blockade provides a viable mechanism for high-fidelity two-qubit gates.
This work is a significant step towards scalable neutral-atom quantum computers.