Molecular One- and Two-Qubit Systems with Very Long Coherence Times

Area of Science:

• Quantum Information Science
• Molecular Engineering
• Organic Chemistry

Background:

• Scalable multi-qubit architectures are crucial for quantum computation and simulation.
• Current challenges in quantum computing stem from difficulties in controlling inter-qubit interactions and ensuring scalability.
• Molecular systems present a unique opportunity for quantum architectures due to their precise structure and tailored interactions.

Purpose of the Study:

• To investigate the spin dynamics of chlorinated triphenylmethyl organic radicals for quantum applications.
• To assess the viability of molecular systems as building blocks for two-qubit quantum architectures.
• To demonstrate essential properties like long coherence times and individual qubit addressability in molecular systems.

Main Methods:

• Studied the spin dynamics of perchlorotriphenylmethyl (PTM) radical and a PTM biradical dimer.
• Measured ensemble coherence times at various temperatures below 100 K.
• Demonstrated two-qubit and single-qubit addressability within the biradical system.

Main Results:

• Observed exceptionally long ensemble coherence times, reaching up to 148 µs across tested temperatures below 100 K.
• Successfully demonstrated both two-qubit and individual qubit addressability in the PTM biradical system.
• Validated the potential of molecular materials for robust quantum information processing.

Conclusions:

• Chlorinated triphenylmethyl organic radicals exhibit properties suitable for quantum computing.
• The demonstrated coherence times and addressability highlight molecular systems as a viable platform for scalable quantum architectures.
• This research supports the development of molecular quantum technologies.