Understanding decoherence in molecular spin qudits

Molecular nanomagnets are quantum spin systems potentially serving as qudits for future quantum technologies thanks to their many accessible low-energy states. At low temperatures, the primary source of error in these systems is pure dephasing, caused by their interactions with the bath of surrounding nuclear spins degrees of freedom. Most importantly, as the system's dimensionality grows going from qubits to qudits, the control and mitigation of decoherence become more challenging. Here, we ...

Slow Relaxation of the Magnetization in Dysprosium–Aluminum Metallacrowns

A series of DyIII-AlIII metallacrowns (MC) with the ligand salicylhydroxamic acid (H3shi) were investigated for magneto-structural interactions. The four MCs demonstrate that slight variations in reaction conditions and molecular components can lead to different classes of MCs. The DyIII-AlIII MCs include an archetype Dy III Al III 4 [12-MC-4], the dimer Dy III 2 Al III 8 [12-MC-4] 2, a [3.3.1] metallacryptand (MCr) Dy III Al III 6 [3.3.1], and Dy III 2 Al III 6 [18-MC-6], representing a new ...

Quantifying complexity of continuous-variable quantum states via Wehrl entropy and Fisher information

The notion of complexity of quantum states is quite different from uncertainty or information contents, and involves the tradeoff between its classical and quantum features. In this work, we introduce a quantifier of complexity of continuous-variable states, e.g. quantum optical states, based on the Husimi quasiprobability distribution. This quantity is built upon two functions of the state: the Wehrl entropy, capturing the spread of the distribution, and the Fisher information with respect t...

A dual perspective review on large language models and code verification