When you walk into a room full of people, you can speculate about all sorts of things, from political leanings to TV viewing habits. But if the room has at least six people, you can […]
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 […]
Integrated silicon nitride photonic chips with meter-long spiral waveguides. Credit: Jijun He and Junqiu Liu (EPFL). Scientists in the group of Professor Tobias J. Kippenberg at EPFL’s School of Basic Sciences have developed ultralow-loss silicon […]
Einstein-Podolski-Rosen correlations can be used for precision measurements. (Image: Jurik Peter, Shutterstock) Quantum systems consisting of several particles can be used to measure magnetic or electric fields more precisely. A young physicist at the University […]
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 […]
John Martinis is maybe best known as being a leader of Google’s team that developed the first quantum computer to vastly outperform a classical computer at a specific task, usually referred to as quantum supremacy. […]
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 […]
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