Quantum 9, 1758 (2025). https://doi.org/10.22331/q-2025-05-28-1758 We propose a novel Reinforcement Learning (RL) method for optimizing quantum circuits using graph-theoretic simplification rules of ZX-diagrams. The agent, trained using the Proximal Policy Optimization (PPO) algorithm, employs Graph […]
Quantum 9, 1757 (2025). https://doi.org/10.22331/q-2025-05-28-1757 In some physical implementations of quantum computers, 2-qubit operations can be applied only on certain pairs of qubits. Compilation of a quantum circuit into one compliant to such qubit connectivity […]
Quantum 9, 1756 (2025). https://doi.org/10.22331/q-2025-05-28-1756 We study a coarse-graining procedure for quantum cellular automata on hypercubic lattices that consists in grouping neighboring cells into tiles and selecting a subspace within each tile. This is done […]
Quantum 9, 1755 (2025). https://doi.org/10.22331/q-2025-05-28-1755 The quantum state preparation of probability distributions is an important subroutine for many quantum algorithms. When embedding $D$-dimensional multivariate probability distributions by discretizing each dimension into $2^n$ points, we need […]
Quantum 9, 1754 (2025). https://doi.org/10.22331/q-2025-05-22-1754 The transfer and storage of quantum information in a hybrid quantum system, consisting of an ensemble of atoms or spins interacting with a cavity, is adversely affected by the inhomogeneity […]
Quantum 9, 1753 (2025). https://doi.org/10.22331/q-2025-05-22-1753 We argue that there exists an operational way to establish the observability of the notions of space and time. Specifically, we propose a theory-independent protocol for a gedanken-experiment, whose outcome […]
Quantum 9, 1752 (2025). https://doi.org/10.22331/q-2025-05-21-1752 We introduce conditionally clean ancilla qubits, a new quantum resource, recently explored by [17], that bridges the gap between traditional clean and dirty ancillae. Like dirty ancillae, they begin and […]
Quantum 9, 1751 (2025). https://doi.org/10.22331/q-2025-05-20-1751 The goal in quantum state transfer is to avoid the need to physically transport carriers of quantum information. This is achieved by using a suitably engineered Hamiltonian that induces the […]
Quantum 9, 1750 (2025). https://doi.org/10.22331/q-2025-05-20-1750 Identification of possible transformations of quantum objects including quantum states and quantum operations is indispensable in developing quantum algorithms. Universal transformations, defined as input-independent transformations, appear in various quantum applications. […]
Quantum 9, 1749 (2025). https://doi.org/10.22331/q-2025-05-20-1749 Masanes, Galley and Müller [39] argue that the measurement postulates of non-relativistic quantum mechanics follow from the structural postulates together with an assumption they call the “possibility of state estimation”. […]
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