Potential molecular qubits with long coherence time constructed using bromo-substituted trityl radicals

Abstract

The development of quantum information science has promoted the emergence of novel molecule-based quantum materials, which attracted widespread interest among chemists. Here we synthesized several bromo-substituted trityl radicals and characterized their spin relaxation properties by X-band pulsed electron paramagnetic resonance. The coherence time of bromo-substituted trityl radicals is enhanced upon the increment of the bromo-substitutions, and significantly longer than the chloro-substituted analogues. In addition, a series of PMMA films doped with different bromo-substituted trityl radicals are prepared and their quantum coherence is characterized at room temperature. The long coherence time of bromo-substituted trityl radicals suggests that these organic molecules are expected to be molecule-based quantum materials for applications in quantum information processing.