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 […]
Quantum 9, 1866 (2025). https://doi.org/10.22331/q-2025-09-29-1866 We present $tt{QuantumToolbox.jl}$, an open-source Julia package for simulating open quantum systems. Designed with a syntax familiar to users of $tt{QuTiP}$ (Quantum Toolbox in Python), it harnesses Julia’s high-performance ecosystem […]
Quantum 9, 1865 (2025). https://doi.org/10.22331/q-2025-09-29-1865 We introduce the Sequency Hierarchy Truncation (SeqHT) scheme for reducing the resources required for state preparation and time evolution in quantum simulations, based upon a truncation in sequency. For the […]
Dear Quantum community, We are aware that Google Scholar has recently stopped indexing Quantum publications. We have identified the cause of the problem, and are working towards a solution. Thank you for your warnings and […]
Quantum 9, 1864 (2025). https://doi.org/10.22331/q-2025-09-24-1864 We prove that adaptive strategies offer no advantage over non-adaptive ones for learning and testing Pauli channels using entangled inputs. This key observation allows us to characterize the query complexity […]
Quantum 9, 1863 (2025). https://doi.org/10.22331/q-2025-09-24-1863 Memory or time-non-local effects in open quantum dynamics pose theoretical as well as practical challenges in the understanding and control of noisy quantum systems. While there has been a comprehensive […]
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