Implementing a noise protected logical qubit in methyl groups via microwave irradiation

Area of Science:

• Quantum Information Science
• Quantum Computing
• Molecular Spin Systems

Background:

• Developing robust quantum bits (qubits) is crucial for advancing quantum computing.
• Utilizing molecular systems offers potential for scalable quantum information processing.
• Noise and decoherence remain significant challenges in current quantum technologies.

Purpose of the Study:

• To propose a proof-of-principle experiment for encoding a logical qubit in a noise-protected subspace.
• To leverage inherent symmetry properties of molecular spin systems for quantum information encoding.
• To demonstrate the feasibility of implementing quantum gates using external fields.

Main Methods:

• Encoding one logical qubit in the noise-protected subspace of three identical spins within a methyl group.
• Analyzing the wavefunction symmetry to reveal correlations between spatial and spin degrees of freedom.
• Utilizing the interaction between the methyl group's electric dipole moment and a circularly polarized microwave field to populate the noiseless subsystem.
• Implementing logical gates by precisely controlling the intensity and phase of the applied microwave field.

Main Results:

• Demonstrated a method to encode a logical qubit in a symmetry-protected subspace.
• Established a correlation between spatial and spin degrees of freedom in the fermionic system.
• Showcased the ability to populate the noiseless subsystem using electric dipole-microwave field interactions.
• Successfully implemented logical gates through controlled microwave field manipulation.

Conclusions:

• The proposed experiment provides a viable pathway for creating noise-protected logical qubits in molecular systems.
• Symmetry correlations in fermionic systems can be exploited for robust quantum information encoding.
• Precise control of external fields enables the manipulation and operation of these molecular qubits.