Towards Bimodal Electron Spin Resonance with a Low-Cost Flexible Spectrometer for Molecular Nanomagnet Experiments

Molecular nanomagnets (MNMs) have shown much promise as potential qubits, harnessing their electrical engineerability and addressability with electron spin resonance (ESR). Many schemes for coupling MNMs to form multi-qubit systems, necessary for actual quantum computation, require two or more ESR frequencies to address the individual qubits. Our lab has developed a low-cost, flexible ESR spectrometer using a field-programmable gate array, custom loop-gap resonators (LGRs), and cheap off-the-shelf electronics. I will report recent work on refining its single-frequency performance, and progress towards integrating a bimodal LGR for simultaneous excitation of both resonant frequencies of a dimer of the MNM Cr₇Mn.