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 […]
Quantum 10, 2111 (2026). https://doi.org/10.22331/q-2026-05-21-2111 Graph states are a key resource for a number of applications in quantum information theory. Due to the inherent noise in noisy intermediate-scale quantum (NISQ) era devices, it is important […]
Quantum 10, 2110 (2026). https://doi.org/10.22331/q-2026-05-20-2110 Quantum computing involving physical systems with continuous degrees of freedom, such as the quantum states of light, has recently attracted significant interest. However, a well-defined quantum complexity theory for these […]
Quantum 10, 2109 (2026). https://doi.org/10.22331/q-2026-05-20-2109 We time-evolve a translationally invariant quantum state on the Quantinuum H1-1 trapped-ion quantum processor, studying the dynamical quantum phase transition of the transverse field Ising model. This physics requires a […]
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