Quantum 10, 2090 (2026). https://doi.org/10.22331/q-2026-05-05-2090 We study higher order quantum maps in the context of a *-autonomous category of affine subspaces. We show that types of higher order maps can be identified with certain Boolean […]
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Quantum 10, 2089 (2026). https://doi.org/10.22331/q-2026-04-29-2089 We introduce regular language states, a family of quantum many-body states. They are built from a special class of formal languages, called regular, which has been thoroughly studied in the […]
Quantum 10, 2088 (2026). https://doi.org/10.22331/q-2026-04-28-2088 We prove new monogamy of entanglement bounds for two-local qudit Hamiltonians of rank-one projectors without one-local terms. In particular, we certify the maximum energy in terms of the maximum matching […]
Quantum 10, 2087 (2026). https://doi.org/10.22331/q-2026-04-28-2087 In unitary circuit games, two competing parties, an “entangler” and a “disentangler”, can induce an entanglement phase transition in a quantum many-body system. The transition occurs at a certain rate […]
Quantum 10, 2086 (2026). https://doi.org/10.22331/q-2026-04-28-2086 We introduce $texttt{RandomMeas.jl}$, a modular and high-performance open-source software package written in Julia for implementing and analyzing randomized measurement protocols in quantum computing. Randomized measurements provide a powerful framework for […]
Quantum 10, 2085 (2026). https://doi.org/10.22331/q-2026-04-28-2085 The coupling of a quantum system to an environment leads generally to decoherence, and it is detrimental to quantum correlations within the system itself. Yet some forms of quantum correlations […]
Quantum 10, 2084 (2026). https://doi.org/10.22331/q-2026-04-28-2084 The question of “non-locality of a single photon”, which started with a paper by Tan, Walls and Collett (TWC, 1991) stirred a thirty years long debate. This hampered attempts to […]
Quantum 10, 2083 (2026). https://doi.org/10.22331/q-2026-04-24-2083 Quantum information is fragile and must be protected by a quantum error-correcting code for large-scale practical applications. Recently, highly efficient quantum codes have been discovered which require a high degree […]
Quantum 10, 2082 (2026). https://doi.org/10.22331/q-2026-04-23-2082 We present a formalism that allows for the direct manipulation and optimization of subspaces, circumventing the need to optimize individual states when using subspace methods. Using the determinant state mapping, […]
Quantum 10, 2081 (2026). https://doi.org/10.22331/q-2026-04-23-2081 Waveguide quantum electrodynamics (QED) provides a powerful framework for engineering quantum interactions, traditionally relying on periodic photonic arrays with continuous energy bands. Here, we investigate waveguide QED in a fundamentally […]
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