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”. […]
Quantum 9, 1748 (2025). https://doi.org/10.22331/q-2025-05-20-1748 Simulating the Hubbard model is of great interest to a wide range of applications within condensed matter physics, however its solution on classical computers remains challenging in dimensions larger than […]
Quantum 9, 1747 (2025). https://doi.org/10.22331/q-2025-05-15-1747 Block Encoding (BE) is a crucial subroutine in many modern quantum algorithms, including those with near-optimal scaling for simulating quantum many-body systems, which often rely on Quantum Signal Processing (QSP). […]
Quantum 9, 1746 (2025). https://doi.org/10.22331/q-2025-05-15-1746 Spontaneous symmetry breaking in systems with symmetry is a cornerstone phenomenon accompanying second-order phase transitions. Here, we predict the opposite phenomenon, namely, spontaneous symmetry emergence in a system that lacks […]
Quantum 9, 1745 (2025). https://doi.org/10.22331/q-2025-05-15-1745 Quantum machine learning (QML) has become a promising area for real world applications of quantum computers, but near-term methods and their scalability are still important research topics. In this context, […]
Quantum 9, 1744 (2025). https://doi.org/10.22331/q-2025-05-15-1744 Losses are one of the main bottlenecks for the distribution of entanglement in quantum networks, which can be overcome by the implementation of quantum repeaters. The most basic form of […]
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