Optimal quantum control of multimode couplings between trapped ion qubits for scalable entanglement

Area of Science:

• Quantum Information Science
• Atomic Physics
• Quantum Computing

Background:

• Trapped ion qubits are a leading platform for quantum computation due to their long coherence times and high gate fidelities.
• Creating multi-qubit entangled states is crucial for advancing quantum algorithms and simulations.
• Controlling collective motional modes in ion chains is essential for efficient qubit-qubit interactions.

Purpose of the Study:

• To demonstrate high-fidelity entangling quantum gates in a chain of five trapped ion qubits.
• To develop a programmable method for constructing multipartite entangled states.
• To enable scalable quantum computation and simulation architectures.

Main Methods:

• Utilizing optimally shaped optical fields to couple multiple collective motional modes of trapped ions.
• Employing individually addressed segmented optical pulses for precise qubit manipulation.
• Implementing a chain of five trapped ion qubits as the quantum register.

Main Results:

• Successful demonstration of entangling quantum gates with high fidelity.
• Programmable construction of multipartite entangled states achieved.
• The method effectively couples qubits via collective motional modes.

Conclusions:

• The developed technique offers a scalable pathway for building larger quantum processors.
• This work advances the capabilities of trapped ion quantum computers.
• The programmable nature of the gates is key for diverse quantum applications.