Molecular Spins and Superconducting Circuits Unlock Quantum Read-Out
![Quantum spin valve efficiency, quantified by η and mutual information [latex]I[/latex], correlates directly with the density of states at the Fermi energy [latex]\rho(E_{F})[/latex], a relationship dictated by the Rice-Mele hopping parameter which, in turn, defines the bandwidth [latex]E_{band}[/latex].](https://arxiv.org/html/2602.21322v1/x6.png)
Researchers have demonstrated a promising new method for reading the states of molecular spin qubits by leveraging the unique properties of near-flat-band electrons and superconducting nanowires.

![The study of a deformed PXP model-specifically examining thermalization dynamics at [latex]L=24[/latex]-reveals a transition from exact scarring under periodic boundary conditions, where the decay rate scales linearly with perturbation strength λ, to approximate scarring under open boundary conditions, evidenced by a quadratic scaling of the decay rate with [latex]\lambda^{2}[/latex] and confirmed by dynamics observed at [latex]\lambda=0[/latex].](https://arxiv.org/html/2602.21962v1/x3.png)
![The reconstruction of model functions [latex]V_{\phi}(\phi)[/latex] and [latex]h_{\phi}(\phi)[/latex] is effectively constrained by the range of φ values-approximately 1.1 to 7.0-covered by the input thermodynamic data at [latex]\mu = 0[/latex], indicating the practical limits of the model’s predictive power within that domain.](https://arxiv.org/html/2602.21618v1/x11.png)

![A tensor completion algorithm, leveraging alternating least squares optimization and weighted least-squares solutions derived from matricized tensor representations, effectively decomposes incomplete data to estimate direction-of-arrival (DOA) angles via factorization of the data into component matrices-specifically, extracting angular information directly from the elements of the estimated factor matrix [latex]\hat{\mathbf{H}}[/latex] to recover automatically paired 2D DOA estimates.](https://arxiv.org/html/2602.21146v1/59.4.png)