From the 1 of 10 linked papers with an AI index.
10 papers
Optimal Dynamic Cooling of Multiple Qubits
Mattia Reda, Massimiliano Sacchi, Chiara Macchiavello +1
We solve the closed-system problem of cooling qubits, selected from identical thermal qubits, to the lowest common local temperature allowed by unitarity. The optimal proto…
Sparse anisotropic positive maps for qutrit entanglement: exact indecomposability and PPT geometry
Massimiliano F. Sacchi
The paper introduces an analytically solvable two‑parameter family of sparse bistochastic positive maps on qutrit systems and uses it to study positivity, indecomposability, PPT‑en…
Entanglement-Assisted Timing Optimization for Discriminating Amplitude-Damping Dynamics
Massimiliano F. Sacchi, Milajiguli Rexiti, Stefano Mancini
We analyze minimum-error discrimination of two qubit dynamical processes generated by phase-covariant amplitude-damping Lindbladians in a single-use scenario. The optimization invo…
Sparse positive maps on qutrits with exact nondecomposability thresholds and PPT-entanglement transitions
Davide Poderini, Angela Rosy Morgillo, Fabio Benatti +3
We study a family of sparse positive maps on qutrits for which positivity, decomposability, and PPT entanglement can all be analysed explicitly. The block structure of the associat…
Full-state information-disturbance tradeoff for direction estimation with antiparallel spin-coherent pairs
Massimiliano F. Sacchi
We determine the optimal information--disturbance tradeoff for estimating an unknown spatial direction encoded in two antiparallel spins. Rotational covariance reduces the optimiza…
Generating Non-Decomposable Maps with Differentiable Semidefinite Programming
Angela Rosy Morgillo, Davide Poderini, Fabio Anselmi +3
Positive maps that are not decomposable are a key resource in entanglement theory because they can detect bound entangled states, yet systematic methods for constructing them remai…