Quantum 10, 2121 (2026). https://doi.org/10.22331/q-2026-05-29-2121 A rigorous characterization of the information content of any highest-spin three-fermion wave function is presented. It is based upon a formal decomposition of the wave function into a finite set […]
Quantum 10, 2120 (2026). https://doi.org/10.22331/q-2026-05-29-2120 Haar random states are fundamental objects in quantum information theory and quantum computing. We study the density matrix resulting from sampling $t$ copies of a $d$-dimensional quantum state according to […]
Quantum 10, 2119 (2026). https://doi.org/10.22331/q-2026-05-29-2119 Dynamical Lie algebras (DLAs) have emerged as a valuable tool in the study of parameterized quantum circuits, helping to characterize both their expressiveness and trainability. In particular, the absence or […]
Quantum 10, 2118 (2026). https://doi.org/10.22331/q-2026-05-29-2118 We propose an efficient classical algorithm to estimate the Neural Tangent Kernel (NTK) associated with a broad class of quantum neural networks. These networks consist of arbitrary unitary operators belonging […]
Quantum 10, 2117 (2026). https://doi.org/10.22331/q-2026-05-29-2117 The availability of certain entangled resource states (catalyst states) can enhance the rate of converting several less entangled states into fewer highly entangled states in a process known as catalytic […]
Quantum 10, 2116 (2026). https://doi.org/10.22331/q-2026-05-26-2116 The Frauchiger–Renner paradox derives an inconsistency when quantum theory is used to describe the use of itself, by means of a scenario where agents model other agents quantumly and reason […]
Quantum 10, 2115 (2026). https://doi.org/10.22331/q-2026-05-22-2115 In classical information theory, the Doeblin coefficient of a classical channel provides an efficiently computable upper bound on the total-variation contraction coefficient of the channel, leading to what is known […]
Quantum 10, 2114 (2026). https://doi.org/10.22331/q-2026-05-22-2114 A defining feature of quantum many-body systems is the exponential scaling of the Hilbert space with the number of degrees of freedom. This exponential complexity naïvely renders a complete state […]
Quantum 10, 2113 (2026). https://doi.org/10.22331/q-2026-05-21-2113 Estimating quantum entropies and divergences is an important problem in quantum physics, information theory, and machine learning. Quantum neural estimators (QNEs), which utilize a hybrid classical-quantum architecture, have recently emerged […]
Quantum 10, 2112 (2026). https://doi.org/10.22331/q-2026-05-21-2112 We investigate the Floquet spectrum of a detuned, driven two-level system and show that it exhibits exact quasienergy crossings when the detuning is an integer multiple of the energy quantum […]
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