Quantum 10, 1980 (2026). https://doi.org/10.22331/q-2026-01-22-1980 Signing quantum messages has long been considered impossible even under computational assumptions. In this work, we challenge this notion and provide three innovative approaches to sign quantum messages that are […]
Quantum 10, 1979 (2026). https://doi.org/10.22331/q-2026-01-21-1979 Locality is a fundamental feature of many physical time evolutions. Assumptions on locality and related structural properties also underlie recently proposed procedures for learning an unknown Hamiltonian from access to […]
Quantum 10, 1978 (2026). https://doi.org/10.22331/q-2026-01-21-1978 Transformations of transformations, also called higher-order transformations, is a natural concept in information processing, which has recently attracted significant interest in the study of quantum causal relations. In this work, […]
Quantum 10, 1977 (2026). https://doi.org/10.22331/q-2026-01-21-1977 Cluster states and graph states in general offer a useful model of the stabilizer formalism and a path toward the development of measurement-based quantum computation. Their defining structure – the […]
Quantum 10, 1976 (2026). https://doi.org/10.22331/q-2026-01-20-1976 Recent theoretical results in quantum machine learning have demonstrated a general trade-off between the expressive power of quantum neural networks (QNNs) and their trainability; as a corollary of these results, […]
Quantum 10, 1975 (2026). https://doi.org/10.22331/q-2026-01-20-1975 For many problems, quantum algorithms promise speedups over their classical counterparts. However, these results predominantly rely on asymptotic worst-case analysis, which overlooks significant overheads due to error correction and the […]
Quantum 10, 1974 (2026). https://doi.org/10.22331/q-2026-01-19-1974 A multi-product formula (MPF) is a promising approach for Hamiltonian simulation efficiently both in the system size $N$ and the inverse allowable error $1/varepsilon$ by combining Trotterization and the linear […]
Quantum 10, 1973 (2026). https://doi.org/10.22331/q-2026-01-19-1973 We consider the task of performing shadow tomography of a logical subsystem defined via the Gottesman-Kitaev-Preskill (GKP) error correcting code. Our protocol does not require the input state to be […]
Quantum 10, 1972 (2026). https://doi.org/10.22331/q-2026-01-19-1972 Photonic systems offer a promising platform for interconnecting quantum processors and enabling scalable, networked architectures. Designing and verifying such architectures requires a unified formalism that integrates linear algebraic reasoning with […]
Quantum 10, 1971 (2026). https://doi.org/10.22331/q-2026-01-19-1971 We introduce the $textit{stellar decomposition}$, a novel method for characterizing non-Gaussian states produced by photon-counting measurements on Gaussian states. Given an $(m+n)$-mode Gaussian state $G$, we express it as an […]
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