Quantum 9, 1820 (2025). https://doi.org/10.22331/q-2025-08-04-1820 We investigate the emergence of stable subspaces in the low-temperature quantum thermal dynamics of finite spin chains. Our analysis reveals the existence of effective decoherence-free qudit subspaces, persisting for timescales […]
Quantum 9, 1819 (2025). https://doi.org/10.22331/q-2025-07-31-1819 The Local Friendliness argument is an extended Wigner’s friend no-go theorem that provides strong constraints on the nature of reality – stronger even than those imposed by Bell’s theorem or […]
Quantum 9, 1818 (2025). https://doi.org/10.22331/q-2025-07-30-1818 Embezzlement of entanglement refers to the task of extracting entanglement from an entanglement resource via local operations and without communication while perturbing the resource arbitrarily little. Recently, the existence of […]
Quantum 9, 1817 (2025). https://doi.org/10.22331/q-2025-07-30-1817 We propose several algorithms for learning unitary operators from quantum statistical queries with respect to their Choi-Jamiolkowski state. Quantum statistical queries capture the capabilities of a learner with limited quantum […]
Quantum 9, 1816 (2025). https://doi.org/10.22331/q-2025-07-29-1816 We introduce “dual-unitary shadow tomography” (DUST), a classical shadow tomography protocol based on dual-unitary brick-wall circuits. To quantify the performance of DUST, we study operator spreading and Pauli weight dynamics […]
Quantum 9, 1815 (2025). https://doi.org/10.22331/q-2025-07-29-1815 In the paradigmatic example of quantum measurements, whenever one measures a system which starts in a superposition of two states of a conserved quantity, it jumps to one of the […]
Quantum 9, 1814 (2025). https://doi.org/10.22331/q-2025-07-29-1814 We consider finite-dimensional many-body quantum systems described by time-independent Hamiltonians and Markovian master equations, and present a systematic method for constructing smaller-dimensional, reduced models that $exactly$ reproduce the time evolution […]
Quantum 9, 1813 (2025). https://doi.org/10.22331/q-2025-07-29-1813 Arunachalam and de Wolf (2018) [1] showed that the sample complexity of quantum batch learning of boolean functions, in the realizable and agnostic settings, has the $textit{same form and order}$ […]
Quantum 9, 1812 (2025). https://doi.org/10.22331/q-2025-07-23-1812 Accurately estimating the properties of quantum systems is a central challenge in quantum computing and quantum information. We propose a method to obtain unbiased estimators of multiple observables with low […]
Quantum 9, 1811 (2025). https://doi.org/10.22331/q-2025-07-23-1811 We derive a class of cellular automata for the Schrödinger Hamiltonian, including scalar and vector potentials. It is based on a multi-split of the Hamiltonian, resulting in a multi-step unitary […]
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