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 […]
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 […]
Technology innovation requires solving hard technical problems, right? Well, yes. And no. As the Apple Macintosh turns 40, what began as Apple prioritizing the squishy concept of “user experience” in its 1984 flagship product is, […]
Back in 2017, my editor published an article titled “The Next Great Computer Interface Is Emerging—But It Doesn’t Have a Name Yet.” Seven years later, which may as well be a hundred in technology years, […]
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