Quantum 5, 527 (2021). https://doi.org/10.22331/q-2021-08-19-527 By taking a Poisson limit for a sequence of rare quantum objects, I derive simple formulas for the Uhlmann fidelity, the quantum Chernoff quantity, the relative entropy, and the Helstrom […]
Quantum 5, 526 (2021). https://doi.org/10.22331/q-2021-08-17-526 What is the role of topology in the propagation of quantum light in photonic lattices? We address this question by studying the propagation of squeezed states in a topological one-dimensional […]
Quantum 5, 525 (2021). https://doi.org/10.22331/q-2021-08-17-525 Quantum interference of “clocks”, namely of particles with time-evolving internal degrees of freedom (DOFs), is a promising avenue to test genuine general relativistic effects in quantum systems. The clock acquires […]
Quantum 5, 524 (2021). https://doi.org/10.22331/q-2021-08-16-524 The quantum measurement problem can be regarded as the tension between the two alternative dynamics prescribed by quantum mechanics: the unitary evolution of the wave function and the state-update rule […]
Quantum 5, 523 (2021). https://doi.org/10.22331/q-2021-08-16-523 In the right conditions, removing one particle from a multipartite bound state can make it fall apart. This feature, known as the “Borromean property”, has been recently demonstrated experimentally in […]
Quantum 5, 522 (2021). https://doi.org/10.22331/q-2021-08-09-522 Although quantum channels underlie the dynamics of quantum states, maps which are not physical channels — that is, not completely positive — can often be encountered in settings such as […]
Quantum 5, 521 (2021). https://doi.org/10.22331/q-2021-08-09-521 Covariant codes are quantum codes such that a symmetry transformation on the logical system could be realized by a symmetry transformation on the physical system, usually with limited capability of […]
Quantum 5, 520 (2021). https://doi.org/10.22331/q-2021-08-09-520 The operational formulations of quantum theory are drastically time oriented. However, to the best of our knowledge, microscopic physics is time-symmetric. We address this tension by showing that the asymmetry […]
Quantum 5, 519 (2021). https://doi.org/10.22331/q-2021-08-09-519 We analyze bipartite matrices and linear maps between matrix algebras, which are respectively, invariant and covariant, under the diagonal unitary and orthogonal groups’ actions. By presenting an expansive list of […]
Quantum 5, 518 (2021). https://doi.org/10.22331/q-2021-08-05-518 In a recent work, it was shown by one of us (EGC) that Bell-Kochen-Specker inequality violations in phenomena satisfying the no-disturbance condition (a generalisation of the no-signalling condition) cannot in […]
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