Quantum 9, 1721 (2025). https://doi.org/10.22331/q-2025-04-24-1721 Motivated by the expectation that relativistic symmetries might acquire quantum features in Quantum Gravity, we take the first steps towards a theory of ”Doubly” Quantum Mechanics, a modification of Quantum […]
Quantum 9, 1720 (2025). https://doi.org/10.22331/q-2025-04-24-1720 This paper introduces the foliage partition, an easy-to-compute LC-invariant for graph states, of computational complexity $mathcal{O}(n^3)$ in the number of qubits. Inspired by the foliage of a graph, our invariant […]
Quantum 9, 1719 (2025). https://doi.org/10.22331/q-2025-04-24-1719 While in relativity theory space evolves over time into a single entity known as spacetime, quantum theory lacks a standard notion of how to encapsulate the dynamical evolution of a […]
Quantum 9, 1718 (2025). https://doi.org/10.22331/q-2025-04-18-1718 We work out the general theory of one-parameter families of partial entanglement properties and the resulting entanglement depth-like quantities. Special cases of these are the depth of partitionability, the depth […]
Quantum 9, 1717 (2025). https://doi.org/10.22331/q-2025-04-18-1717 In unitary property testing a quantum algorithm, also known as a tester, is given query access to a black-box unitary and has to decide whether it satisfies some property. We […]
Quantum 9, 1716 (2025). https://doi.org/10.22331/q-2025-04-18-1716 $mathcal{PT}$-symmetric systems have garnered significant attention due to their unconventional properties. Despite the growing interest, there remains an ongoing debate about whether these systems outperform their Hermitian counterparts in practical […]
Quantum 9, 1715 (2025). https://doi.org/10.22331/q-2025-04-18-1715 We study the geodesics on the manifold of mixed quantum states for the Bures metric. It is shown that these geodesics correspond to physical non-Markovian evolutions of the system coupled […]
Quantum 9, 1714 (2025). https://doi.org/10.22331/q-2025-04-18-1714 We introduce an optimal strategy to sample quantum outcomes of local measurement strings for isometric tensor network states. Our method generates samples based on an exact cumulative bounding function, without […]
Quantum 9, 1713 (2025). https://doi.org/10.22331/q-2025-04-18-1713 We propose an interferometric scheme where each photon returns one bit of the binary expansion of an unknown phase. It sets up a method for estimating the phase value at […]
Quantum 9, 1712 (2025). https://doi.org/10.22331/q-2025-04-18-1712 Extended non-local games are a generalization of monogamy-of-entanglement games, played by two quantum parties and a quantum referee that performs a measurement on their local quantum system. Along the lines […]
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