One-Photon Solutions to the Multiqubit Multimode Quantum Rabi Model for Fast W-State Generation

Area of Science:

• Quantum optics
• Quantum information science
• Solid-state physics

Background:

• General solutions to the quantum Rabi model typically require infinite photon subspaces.
• Investigating the multiqubit, multimode quantum Rabi model is crucial for scalable quantum technologies.

Purpose of the Study:

• To identify special, analytically solvable solutions within the multiqubit, multimode quantum Rabi model.
• To propose a method for generating entangled quantum states using these special solutions.
• To demonstrate the experimental feasibility of the proposed model and state generation.

Main Methods:

• Derivation of special solutions with a single-photon subspace for the multiqubit, multimode quantum Rabi model.
• Development of an adiabatic quantum state transfer scheme.
• Design of a superconducting circuit architecture for state generation and manipulation.

Main Results:

• Identified novel, analytically tractable solutions with at most one photon for arbitrary qubits and modes.
• Achieved deterministic generation of two-qubit Bell states and single-photon multimode W states with <1% nonadiabatic error.
• Proposed a superconducting circuit design demonstrating experimental feasibility.

Conclusions:

• The discovered special solutions offer a pathway to efficient quantum state generation in complex quantum systems.
• The proposed adiabatic scheme and circuit design pave the way for practical implementation of the multiqubit, multimode quantum Rabi model.