Quantum 8, 1242 (2024). https://doi.org/10.22331/q-2024-02-05-1242 Classical non-perturbative simulations of open quantum systems’ dynamics face several scalability problems, namely, exponential scaling of the computational effort as a function of either the time length of the simulation […]
Quantum 8, 1241 (2024). https://doi.org/10.22331/q-2024-02-05-1241 Quantum processes with indefinite causal structure emerge when we wonder which are the most general evolutions, allowed by quantum theory, of a set of local systems which are not assumed […]
Quantum 8, 1240 (2024). https://doi.org/10.22331/q-2024-02-05-1240 We analyse nonclassical resources in interference phenomena using generalized noncontextuality inequalities and basis-independent coherence witnesses. We use recently proposed inequalities that witness both resources within the same framework. We also […]
Quantum 8, 1239 (2024). https://doi.org/10.22331/q-2024-02-01-1239 Variational quantum algorithms, which combine highly expressive parameterized quantum circuits (PQCs) and optimization techniques in machine learning, are one of the most promising applications of a near-term quantum computer. Despite […]
Quantum 8, 1238 (2024). https://doi.org/10.22331/q-2024-01-31-1238 We construct a lower bound of the tensor rank for a new class of tensors, which we call $textit{persistent tensors}$. We present three specific families of persistent tensors, of which […]
Quantum 8, 1237 (2024). https://doi.org/10.22331/q-2024-01-30-1237 The interaction between localized emitters and quantum fields, both in relativistic settings and in the case of ultra-strong couplings, requires non-perturbative methods beyond the rotating-wave approximation. In this work we […]
Quantum 8, 1236 (2024). https://doi.org/10.22331/q-2024-01-30-1236 High-dimensional entanglement has been identified as an important resource in quantum information processing, and also as a main obstacle for simulating quantum systems. Its certification is often difficult, and most […]
Quantum 8, 1235 (2024). https://doi.org/10.22331/q-2024-01-25-1235 We construct a resource theory of $sharpness$ for finite-dimensional positive operator-valued measures (POVMs), where the $sharpness-non-increasing$ operations are given by quantum preprocessing channels and convex mixtures with POVMs whose elements […]
Quantum 8, 1234 (2024). https://doi.org/10.22331/q-2024-01-25-1234 Spin anticoherent states acquired recently a lot of attention as the most “quantum” states. Some coherent and anticoherent spin states are known as optimal quantum rotosensors. In this work, we […]
Quantum 8, 1233 (2024). https://doi.org/10.22331/q-2024-01-24-1233 Recent constructions of quantum low-density parity-check (QLDPC) codes provide optimal scaling of the number of logical qubits and the minimum distance in terms of the code length, thereby opening the […]
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