Quantum 9, 1876 (2025). https://doi.org/10.22331/q-2025-10-06-1876 We apply the recent graphical framework of “Quantum Lego” to XP stabilizer codes where the stabilizer group is generally non-Abelian. We show that the idea of operator matching continues to […]
Quantum 9, 1875 (2025). https://doi.org/10.22331/q-2025-10-06-1875 We explore indefinite causal order between events in the context of quasiclassical spacetimes in superposition. We introduce several new quantifiers to measure the degree of indefiniteness of the causal order […]
Quantum 9, 1874 (2025). https://doi.org/10.22331/q-2025-10-02-1874 We generalize the Levitov-Lesovik formula for the probability distribution function of the electron charge transferred through a phase coherent conductor, to include projective measurements that monitor the chiral propagation in […]
Quantum 9, 1873 (2025). https://doi.org/10.22331/q-2025-10-02-1873 The discovery of the backpropagation algorithm ranks among one of the most important moments in the history of machine learning, and has made possible the training of large-scale neural networks […]
Quantum 9, 1872 (2025). https://doi.org/10.22331/q-2025-10-01-1872 Quantum simulation of lattice gauge theories is an important avenue to gain insights into both particle physics phenomena and constrained quantum many-body dynamics. There is a growing interest in probing […]
Quantum 9, 1871 (2025). https://doi.org/10.22331/q-2025-10-01-1871 We extend the concept of operator charge in the context of an abelian $U(1)$ symmetry and apply this framework to symmetry-preserving matrix product operators (MPOs), enabling the description of operators […]
Quantum 9, 1870 (2025). https://doi.org/10.22331/q-2025-10-01-1870 Genuine multipartite entanglement of a given multipartite pure quantum state can be quantified through its geometric measure of entanglement, which, up to logarithms, is simply the maximum overlap of the […]
Quantum 9, 1869 (2025). https://doi.org/10.22331/q-2025-10-01-1869 Twin-Field Quantum Key Distribution (QKD) is a QKD protocol that uses single-photon interference to perform QKD over long distances. QKD protocols that encode information using high-dimensional quantum states can benefit […]
Quantum 9, 1868 (2025). https://doi.org/10.22331/q-2025-09-30-1868 Often, the microscopic interaction mechanism of an open quantum system gives rise to a `counter term’ which renormalises the system Hamiltonian. Such term compensates for the distortion of the system’s […]
Quantum 9, 1867 (2025). https://doi.org/10.22331/q-2025-09-30-1867 In multi-parameter quantum metrology, the resource of entanglement can lead to an increase in efficiency of the estimation process. Entanglement can be used in the state preparation stage, or the […]
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