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, […]
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 […]
Quantum 8, 1228 (2024). https://doi.org/10.22331/q-2024-01-15-1228 We study how parallelism can speed up quantum simulation. A parallel quantum algorithm is proposed for simulating the dynamics of a large class of Hamiltonians with good sparse structures, called […]
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