Quantum 9, 1603 (2025). https://doi.org/10.22331/q-2025-01-21-1603 Quantum state purification is the task of recovering a nearly pure copy of an unknown pure quantum state using multiple noisy copies of the state. This basic task has applications […]
Quantum 9, 1602 (2025). https://doi.org/10.22331/q-2025-01-20-1602 In the last two decades, there has been much effort in finding secure protocols for two-party cryptographic tasks. It has since been discovered that even with quantum mechanics, many such […]
Quantum 9, 1601 (2025). https://doi.org/10.22331/q-2025-01-20-1601 Split Cayley hexagons of order two are distinguished finite geometries living in the three-qubit symplectic polar space in two different forms, called classical and skew. Although neither of the two […]
Quantum 9, 1600 (2025). https://doi.org/10.22331/q-2025-01-20-1600 In this work, we introduce a fast implementation of the minimum-weight perfect matching (MWPM) decoder, the most widely used decoder for several important families of quantum error correcting codes, including […]
Quantum 9, 1599 (2025). https://doi.org/10.22331/q-2025-01-20-1599 Hardy’s argument constitutes an elegantly logical test for identifying nonlocal features of multipartite correlations. In this paper, we investigate Hardy’s nonlocal behavior within a broad class of operational theories, including […]
Quantum 9, 1598 (2025). https://doi.org/10.22331/q-2025-01-15-1598 In a Generalised Probabilistic Theory (GPT) equipped additionally with some extra geometric structure we define the morphophoric measurements as those for which the measurement map sending states to distributions of […]
Quantum 9, 1597 (2025). https://doi.org/10.22331/q-2025-01-15-1597 In this work, we consider a fundamental task in quantum many-body physics – finding and learning ground states of quantum Hamiltonians and their properties. Recent works have studied the task […]
Quantum 9, 1596 (2025). https://doi.org/10.22331/q-2025-01-15-1596 Distributed quantum sensing enables the estimation of multiple parameters encoded in spatially separated probes. While traditional quantum sensing is often focused on estimating a single parameter with maximum precision, distributed […]
Quantum 9, 1595 (2025). https://doi.org/10.22331/q-2025-01-15-1595 We improve the test to show the impossibility of a quantum theory based on real numbers by a larger ratio of complex-to-real bound on a Bell-type parameter. In contrast to […]
Quantum 9, 1594 (2025). https://doi.org/10.22331/q-2025-01-15-1594 Quantum optimization methods use a continuous degree-of-freedom of quantum states to heuristically solve combinatorial problems, such as the MAX-CUT problem, which can be attributed to various NP-hard combinatorial problems. This […]
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