Quantum 7, 1104 (2023). https://doi.org/10.22331/q-2023-09-07-1104 A powerful operational paradigm for distributed quantum information processing involves manipulating pre-shared entanglement by local operations and classical communication (LOCC). The LOCC round complexity of a given task describes how […]
Quantum 7, 1103 (2023). https://doi.org/10.22331/q-2023-09-07-1103 We show that the proof of the generalised quantum Stein’s lemma [Brandão & Plenio, Commun. Math. Phys. 295, 791 (2010)] is not correct due to a gap in the argument […]
Quantum 7, 1102 (2023). https://doi.org/10.22331/q-2023-09-07-1102 Integral representations of quantum relative entropy, and of the directional second and higher order derivatives of von Neumann entropy, are established, and used to give simple proofs of fundamental, known […]
Quantum 7, 1101 (2023). https://doi.org/10.22331/q-2023-09-07-1101 An orthogonal set of states in multipartite systems is called to be strong quantum nonlocality if it is locally irreducible under every bipartition of the subsystems [46]. In this work, […]
Quantum 7, 1100 (2023). https://doi.org/10.22331/q-2023-09-07-1100 The Zeno effect, in which repeated observation freezes the dynamics of a quantum system, stands as an iconic oddity of quantum mechanics. When a measurement is unable to distinguish between […]
Quantum 7, 1099 (2023). https://doi.org/10.22331/q-2023-08-31-1099 Spin-photon interfaces (SPIs) are key devices of quantum technologies, aimed at coherently transferring quantum information between spin qubits and propagating pulses of polarized light. We study the potential of a […]
Quantum 7, 1098 (2023). https://doi.org/10.22331/q-2023-08-29-1098 In standard quantum mechanics, reference frames are treated as abstract entities. We can think of them as idealized, infinite-mass subsystems which decouple from the rest of the system. In nature, […]
Quantum 7, 1097 (2023). https://doi.org/10.22331/q-2023-08-29-1097 Linear optical quantum circuits with photon number resolving (PNR) detectors are used for both Gaussian Boson Sampling (GBS) and for the preparation of non-Gaussian states such as Gottesman-Kitaev-Preskill (GKP), cat […]
Quantum 7, 1096 (2023). https://doi.org/10.22331/q-2023-08-29-1096 Neural network approaches to approximate the ground state of quantum hamiltonians require the numerical solution of a highly nonlinear optimization problem. We introduce a statistical learning approach that makes the […]
Quantum 7, 1095 (2023). https://doi.org/10.22331/q-2023-08-29-1095 Recent studies showed the finite-size security of binary-modulation CV-QKD protocols against general attacks. However, they gave poor key-rate scaling against transmission distance. Here, we extend the security proof based on […]
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