General scheme for the construction of a protected qubit subspace

Area of Science:

• Quantum Information Science
• Quantum Computing
• Atomic, Molecular, and Optical Physics

Background:

• Quantum systems are highly susceptible to environmental noise, leading to decoherence.
• Existing decoupling schemes have limitations in protecting qubits with various angular momentum states.

Purpose of the Study:

• To develop a robust decoupling scheme for protecting quantum information in systems with integer or half-integer angular momentum states.
• To enhance qubit coherence times for practical quantum information science applications.

Main Methods:

• Utilized continuous dynamical decoupling techniques.
• Implemented a multistate qubit construction to create a protected qubit subspace.
• Analyzed scheme performance using trapped ions as a specific case.

Main Results:

• Demonstrated a robust decoupling scheme applicable to diverse angular momentum states.
• Showcased efficient implementation of single qubit gates and cavity coupling for trapped ions.
• Predicted coherence times of approximately 1 second, a significant improvement over milliseconds.

Conclusions:

• The presented scheme offers a robust method for quantum information processing.
• The technique is experimentally feasible with current technology and has broad applicability.
• Significant enhancement in coherence times paves the way for advanced quantum technologies.