Quantum 5, 446 (2021). https://doi.org/10.22331/q-2021-04-28-446 We consider the estimation of a Hamiltonian parameter of a set of highly photosensitive samples, which are damaged after a few photons $N_{rm abs}$ are absorbed, for a total time […]
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Quantum 5, 445 (2021). https://doi.org/10.22331/q-2021-04-28-445 A reconstruction of quantum theory refers to both a mathematical and a conceptual paradigm that allows one to derive the usual formulation of quantum theory from a set of primitive […]
Quantum 5, 444 (2021). https://doi.org/10.22331/q-2021-04-26-444 Device-independent quantum key distribution aims at providing security guarantees even when using largely uncharacterised devices. In the simplest scenario, these guarantees are derived from the CHSH score, which is a […]
Quantum 5, 443 (2021). https://doi.org/10.22331/q-2021-04-26-443 The simplest device-independent quantum key distribution protocol is based on the Clauser-Horne-Shimony-Holt (CHSH) Bell inequality and allows two users, Alice and Bob, to generate a secret key if they observe […]
Building a computer that can support artificial intelligence at the scale and complexity of the human brain will be a colossal engineering effort. Now researchers at the National Institute of Standards and Technology have outlined […]
Quantum 5, 442 (2021). https://doi.org/10.22331/q-2021-04-26-442 We analyse orthogonal bases in a composite $Ntimes N$ Hilbert space describing a bipartite quantum system and look for a basis with optimal single-sided mutual state distinguishability. This condition implies […]
Quantum 5, 441 (2021). https://doi.org/10.22331/q-2021-04-26-441 Similarly to quantum states, quantum operations can also be transformed by means of quantum superchannels, also known as process matrices. Quantum superchannels with multiple slots are deterministic transformations which take […]
Quantum 5, 440 (2021). https://doi.org/10.22331/q-2021-04-26-440 We present a method to detect quantum memory in a non-Markovian process. We call a process Markovian when the environment does not provide a memory that retains correlations across different […]
Quantum 5, 439 (2021). https://doi.org/10.22331/q-2021-04-26-439 The exchange of information between an open quantum system and its environment allows us to discriminate among different kinds of dynamics, in particular detecting memory effects to characterize non-Markovianity. Here, […]
The world’s biggest AI chip just doubled its specs—without adding an inch. The Cerebras Systems Wafer Scale Engine is about the size of a big dinner plate. All that surface area enables a lot more […]
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