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 […]
Quantum 8, 1232 (2024). https://doi.org/10.22331/q-2024-01-24-1232 The Hidden Quantum Markov Model (HQMM) has significant potential for analyzing time-series data and studying stochastic processes in the quantum domain as an upgrading option with potential advantages over classical […]
Quantum 8, 1231 (2024). https://doi.org/10.22331/q-2024-01-18-1231 Quantum Approximate Optimization Algorithm (QAOA) is a leading candidate algorithm for solving combinatorial optimization problems on quantum computers. However, in many cases QAOA requires computationally intensive parameter optimization. The challenge […]
Quantum 8, 1230 (2024). https://doi.org/10.22331/q-2024-01-18-1230 This work presents a study of Kolmogorov complexity for general quantum states from the perspective of deterministic-control quantum Turing Machines (dcq-TM). We extend the dcq-TM model to incorporate mixed state […]
Quantum 8, 1229 (2024). https://doi.org/10.22331/q-2024-01-18-1229 We study the competing effects of collective generalized measurements and interaction-induced scrambling in the dynamics of an ensemble of spin-1/2 particles at the level of quantum trajectories. This setup can […]
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