Quantum 9, 1847 (2025). https://doi.org/10.22331/q-2025-09-03-1847 In this work, we highlight an unforeseen behavior of the expressivity of Parameterized Quantum Circuits (PQCs) for machine learning. A large class of these models, seen as Fourier series whose […]
Quantum 9, 1846 (2025). https://doi.org/10.22331/q-2025-09-03-1846 Code switching is an established technique that facilitates a universal set of FT quantum gate operations by combining two QEC codes with complementary sets of gates, which each by themselves […]
Quantum 9, 1845 (2025). https://doi.org/10.22331/q-2025-09-03-1845 We consider introducing the Dirac sea in a quantum cellular automata model of fermions in discrete spacetime which approximates the Dirac equation in the continuum limit. However, if we attempt […]
Quantum 9, 1844 (2025). https://doi.org/10.22331/q-2025-09-03-1844 Generalizing the well-known spin-squeezing inequalities, we study the relation between squeezing of collective $N$-particle $su(d)$ operators and many-body entanglement geometry in multi-particle systems. For that aim, we define the set […]
Quantum 9, 1843 (2025). https://doi.org/10.22331/q-2025-08-29-1843 Building upon recent progress in Lindblad engineering for quantum Gibbs state preparation algorithms, we propose a simplified protocol that is shown to be efficient under the eigenstate thermalization hypothesis (ETH). […]
Quantum 9, 1842 (2025). https://doi.org/10.22331/q-2025-08-29-1842 Starting with an explicit framework for designing logical Clifford circuits for CSS codes, we construct logical gates for Hypergraph Product Codes. We first derive symplectic matrices for CNOT, CZ, Phase, […]
Quantum 9, 1841 (2025). https://doi.org/10.22331/q-2025-08-29-1841 Variational quantum algorithms are viewed as promising candidates for demonstrating quantum advantage on near-term devices. These approaches typically involve the training of parameterized quantum circuits through a classical optimization loop. […]
Quantum 9, 1840 (2025). https://doi.org/10.22331/q-2025-08-29-1840 Quantum error mitigation is regarded as a possible path to near-term quantum utility. The methods under the quantum error mitigation umbrella term, such as probabilistic error cancellation (PEC), zero-noise extrapolation […]
Quantum 9, 1839 (2025). https://doi.org/10.22331/q-2025-08-28-1839 We prove that $sf{QMA}$ where the verifier may also make a single $non-collapsing$ measurement [7] is equal to $sf{NEXP}$, resolving an open question of Aaronson [5]. We show this is […]
Quantum 9, 1838 (2025). https://doi.org/10.22331/q-2025-08-28-1838 Quantum computers are a highly promising tool for efficiently simulating quantum many-body systems. The preparation of their eigenstates is of particular interest and can be addressed, e.g., by quantum phase […]
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