Quantum 6, 663 (2022). https://doi.org/10.22331/q-2022-03-01-663 The causal order of events need not be fixed: whether a bus arrives before or after another at a certain stop can depend on other variables – like traffic. Coherent […]
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Quantum 6, 662 (2022). https://doi.org/10.22331/q-2022-03-01-662 For a classical channel, neither the Shannon ca-pa-city, nor the sum of conditional probabilities corresponding to the cases of successful transmission can be increased by the use of shared entanglement, […]
Scientists have long made digital simulations of the universe on the grandest scales. Now they’re turning their attention to smaller systems—though those systems are no less grand. The cells in our bodies are like their […]
Quantum 6, 661 (2022). https://doi.org/10.22331/q-2022-02-24-661 We introduce the hemicubic codes, a family of quantum codes obtained by associating qubits with the $p$-faces of the $n$-cube (for $n>p$) and stabilizer constraints with faces of dimension $(ppm1)$. […]
Quantum 6, 660 (2022). https://doi.org/10.22331/q-2022-02-24-660 Many applications in quantum communication, sensing and computation need provably quantum non-Gaussian light. Recently such light, witnessed by a negative Wigner function, has been estimated using homodyne tomography from a […]
Quantum 6, 659 (2022). https://doi.org/10.22331/q-2022-02-21-659 Spekkens has introduced an $textit{epistemically restricted classical theory}$ of discrete systems, based on discrete phase space. The theory manifests a number of quantum-like properties but cannot fully imitate quantum theory […]
Quantum 6, 658 (2022). https://doi.org/10.22331/q-2022-02-21-658 We consider online strategies for discriminating between symmetric pure states with zero error when $n$ copies of the states are provided. Optimized online strategies involve local, possibly adaptive measurements on […]
Quantum 6, 657 (2022). https://doi.org/10.22331/q-2022-02-21-657 We propose a method to reliably and efficiently extract the fidelity of many-qubit quantum circuits composed of continuously parametrized two-qubit gates called matchgates. This method, which we call $textit{matchgate benchmarking}$, […]
Quantum 6, 656 (2022). https://doi.org/10.22331/q-2022-02-21-656 In this work, we characterize the amount of steerability present in quantum theory by connecting the maximal violation of a steering inequality to an inclusion problem of free spectrahedra. In […]
Quantum 6, 655 (2022). https://doi.org/10.22331/q-2022-02-16-655 Information-theoretic ideas have provided numerous insights in the progress of fundamental physics, especially in our pursuit of quantum gravity. In particular, the holographic entanglement entropy is a very useful tool […]
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