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 […]
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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 […]
Quantum 9, 1914 (2025). https://doi.org/10.22331/q-2025-11-17-1914 An important class of fermionic observables, relevant in tasks such as fermionic partial tomography and estimating energy levels of chemical Hamiltonians, are the binary measurements obtained from the product of […]
Quantum 9, 1913 (2025). https://doi.org/10.22331/q-2025-11-17-1913 In this work, we develop a graphical calculus for multi-qudit computations with generalized Clifford algebras, building off the algebraic framework developed in our prior work. We build our graphical calculus […]
Quantum 9, 1912 (2025). https://doi.org/10.22331/q-2025-11-17-1912 Recent experimental progress in controlling open quantum systems enables the pursuit of mixed-state nonequilibrium quantum phases. We investigate whether open quantum systems hosting mixed-state symmetry-protected topological states as steady states […]
Quantum 9, 1911 (2025). https://doi.org/10.22331/q-2025-11-17-1911 Quantum networks are important for quantum communication, enabling tasks such as quantum teleportation, quantum key distribution, quantum sensing, and quantum error correction, often utilizing graph states, a specific class of […]
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