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Asymmetric Blockade and Multiqubit Gates via Dipole-Dipole Interactions
Jeremy T Young1,2,3, Przemyslaw Bienias3,4, Ron Belyansky3,4
1JILA, University of Colorado and National Institute of Standards and Technology, and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.
Physical Review Letters
|October 1, 2021
Summary
Researchers developed multiqubit Rydberg-blockade gates using strong microwave fields. This innovation simplifies quantum algorithms and state preparation, enabling complex tasks like creating a 25-atom Greenberger-Horne-Zeilinger state with high fidelity.
Area of Science:
- Quantum computing
- Atomic physics
- Quantum information science
Background:
- Rydberg atoms exhibit strong, tunable interactions suitable for fast two-qubit entangling gates.
- Current methods often focus on two-qubit interactions, limiting scalability for complex quantum operations.
Purpose of the Study:
- To generalize the two-qubit Rydberg-blockade gate to multiqubit interactions.
- To enable simultaneous control and entanglement of multiple qubits using Rydberg interactions.
- To simplify quantum algorithms and state preparation through efficient multiqubit gates.
Main Methods:
- Proposing a generalized multiqubit Rydberg-blockade gate.
- Utilizing strong microwave fields to dress nearby Rydberg states.
- Engineering asymmetric blockade favoring control-target interactions over control-control and target-target interactions.
Main Results:
- Demonstrated a method for simultaneous multiqubit entanglement.
- Achieved asymmetric blockade, enhancing control over specific qubit interactions.
- Showcased the creation of a 25-atom Greenberger-Horne-Zeilinger state using only three gates.
- Reported a low error rate of 5.8% for the 25-atom state preparation.
Conclusions:
- The proposed multiqubit Rydberg-blockade gates offer a significant advancement in quantum computation scalability.
- This approach drastically simplifies complex quantum algorithms and state preparation protocols.
- The demonstrated high-fidelity creation of a large entangled state validates the potential of this technique for future quantum technologies.
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