Quantum breakthrough: Researchers execute Fourier Transform on a molecular qudit

A team of researchers in Parma has made a breakthrough in quantum computing by successfully implementing the Quantum Fourier Transform (QFT) on a molecular qudit. The study, led by Prof. Roberto De Renzi, demonstrates the potential of molecular spin qubits for future quantum technologies. Their findings were recently published in the journal Nature. The experiment took place at the University of Parma’s Department of Mathematical, Physical and Computer Sciences. Researchers used a 173Yb(trensal) molecular qudit, a complex system where quantum information is stored in multiple energy levels. The QFT—a key component in many quantum algorithms—was executed using radio frequency pulses.

The team relied on an advanced setup combining the Active Technologies AWG-5062D with a HyReSpect spectrometer. This allowed them to generate pulses of any shape, offering full flexibility in testing different conditions. Crucially, the instrument could produce sub-nanosecond pulses, with durations as short as 230 picoseconds. These ultra-fast pulses were vital for manipulating the qudit’s states and storing quantum information in the phases of its coherences. The QFT served as both a rigorous test for coherence control and a benchmark for molecular spin qudits, proving their viability in quantum computing applications.

The successful implementation of the QFT highlights the precision and adaptability of molecular spin qudits. With the ability to generate custom pulse shapes at extreme speeds, the research opens new pathways for developing quantum technologies. The results reinforce the role of molecular systems in advancing quantum algorithms.