Quantum 9, 1924 (2025). https://doi.org/10.22331/q-2025-12-02-1924 Digital quantum simulation (DQS) is one of the most promising paths for achieving first useful real-world applications for quantum processors. Yet even assuming rapid progress in device engineering and development […]
Quantum 9, 1923 (2025). https://doi.org/10.22331/q-2025-12-02-1923 Over the past decade, a number of quantum processes have been proposed which are logically consistent, yet feature a cyclic causal structure. However, there is no general formal method to […]
Quantum 9, 1922 (2025). https://doi.org/10.22331/q-2025-12-02-1922 Quantum random-access memory (QRAM) is a mechanism to access data (quantum or classical) based on addresses which are themselves a quantum state. QRAM has a long and controversial history, and […]
Quantum 9, 1921 (2025). https://doi.org/10.22331/q-2025-12-02-1921 The Pauli exclusion principle is fundamental to understanding electronic quantum systems. It namely constrains the expected occupancies $n_i$ of orbitals $varphi_i$ according to $0 leq n_i leq 2$. In this […]
Quantum 9, 1920 (2025). https://doi.org/10.22331/q-2025-11-27-1920 We propose a model for quantum computing with long chains of trapped ions and we design quantum error correction schemes for this model. The main components of a quantum error […]
Quantum 9, 1919 (2025). https://doi.org/10.22331/q-2025-11-20-1919 Sequential methods for quantum hypothesis testing offer significant advantages over fixed-length approaches, which rely on a predefined number of state copies. Despite their potential, these methods remain underexplored for unambiguous […]
Quantum 9, 1918 (2025). https://doi.org/10.22331/q-2025-11-20-1918 The spectral variant of the quantum marginal problem asks: Given prescribed spectra for a set of overlapping quantum marginals, does there exist a compatible joint state? The main idea of […]
Quantum 9, 1917 (2025). https://doi.org/10.22331/q-2025-11-20-1917 We study a qDRIFT-type randomized method to simulate Lindblad dynamics by decomposing its generator into an ensemble of Lindbladians, $mathcal{L} = sum_{a in mathcal{A}} mathcal{L}_a$, where each $mathcal{L}_a$ comprises a […]
Quantum 9, 1916 (2025). https://doi.org/10.22331/q-2025-11-20-1916 To better understand quantum computation we can search for its limits or no-gos, especially if analogous limits do not appear in classical computation. Classical computation easily implements and extensively employs […]
Quantum 9, 1915 (2025). https://doi.org/10.22331/q-2025-11-17-1915 Loop-based boson samplers interfere photons in the time degree of freedom using a sequence of delay lines. Since they require few hardware components while also allowing for long-range entanglement, they […]
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