A proposal for implementing an n-qubit controlled-rotation gate with three-level superconducting qubit systems in...

Area of Science:

• Quantum Computing
• Superconducting Circuits
• Cavity Quantum Electrodynamics

Background:

• Implementing multi-qubit gates is crucial for quantum computation.
• Superconducting qubits are a leading platform for quantum information processing.
• Three-level systems offer enhanced control possibilities.

Purpose of the Study:

• To present a novel method for implementing an n-qubit controlled-rotation gate.
• To utilize three-level superconducting qubits within a cavity quantum electrodynamics framework.
• To explore gate characteristics with increasing qubit numbers.

Main Methods:

• Utilizing the two lowest energy levels as logical qubit states.
• Employing a higher energy level for gate implementation.
• Preparing a W state conditioned on control qubits and using a cavity photon for target qubit rotation.

Main Results:

• The number of operational steps remains constant regardless of the number of qubits (n).
• Gate operation time decreases as the number of qubits increases.
• The method is general and applicable to various superconducting devices coupled to resonators.

Conclusions:

• The proposed method provides an efficient way to implement n-qubit controlled-rotation gates.
• This technique offers scalability advantages in terms of operational steps and speed.
• The approach is versatile for different superconducting qubit architectures in cavity QED.