Quantum 9, 1834 (2025). https://doi.org/10.22331/q-2025-08-27-1834 Quantum signal processing (QSP) is a methodology for constructing polynomial transformations of a linear operator encoded in a unitary. Applied to an encoding of a state $rho$, QSP enables the […]
Quantum 9, 1833 (2025). https://doi.org/10.22331/q-2025-08-27-1833 We significantly enhance the simulation accuracy of initial Trotter circuits for Hamiltonian simulation of quantum systems by integrating first-order Riemannian optimization with tensor network methods. Unlike previous approaches, our method […]
Quantum 9, 1832 (2025). https://doi.org/10.22331/q-2025-08-27-1832 Estimating the trace of quantum state powers, $text{Tr}(rho^k)$, for $k$ identical quantum states is a fundamental task with numerous applications in quantum information processing, including nonlinear function estimation of quantum […]
Quantum 9, 1831 (2025). https://doi.org/10.22331/q-2025-08-27-1831 We investigate boundaries of 3D color codes and provide a systematic classification into 101 distinct boundary types, including two novel classes. The first class consists of 1 boundary and is […]
Quantum 9, 1830 (2025). https://doi.org/10.22331/q-2025-08-27-1830 Quantum networks allow for novel forms of quantum nonlocality. By exploiting the combination of entangled states and entangled measurements, strong nonlocal correlations can be generated across the entire network. So […]
Quantum 9, 1829 (2025). https://doi.org/10.22331/q-2025-08-27-1829 We propose several optimizations of the CliNR partial error correction scheme which implements Clifford circuits by consuming a resource state. Errors are corrected by measuring a sequence of Pauli operators […]
Quantum 9, 1828 (2025). https://doi.org/10.22331/q-2025-08-27-1828 Parametrised quantum circuits contain phase gates whose phase is determined by a classical algorithm prior to running the circuit on a quantum device. Such circuits are used in variational algorithms […]
Quantum 9, 1827 (2025). https://doi.org/10.22331/q-2025-08-08-1827 We propose an experimental setup to probe the interplay between the quantum superposition principle and gravitational time dilation arising from the mass-energy equivalence. It capitalizes on state-of-the-art atom interferometers that […]
Quantum 9, 1826 (2025). https://doi.org/10.22331/q-2025-08-08-1826 We introduce a new class of qubit codes that we call Evenbly codes, building on a previous proposal of hyperinvariant tensor networks. Its tensor network description consists of local, non-perfect […]
Quantum 9, 1825 (2025). https://doi.org/10.22331/q-2025-08-08-1825 The rapid advancement of quantum hardware necessitates the development of reliable methods to certify its correct functioning. However, existing certification tests fall short, as they either suffer from systematic errors […]
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