Quantum computers have the potential to vastly exceed the capabilities of conventional computers for certain tasks. But there is still a long way to go before they can help to solve real-world problems. Many applications […]
There has been a lot of buzz about quantum computers and for good reason. The futuristic computers are designed to mimic what happens in nature at microscopic scales, which means they have the power to […]
When materials are cooled down to extremely low temperatures, their behavior often differs strongly from that at room temperature. A well-known example is superconductivity: below a critical temperature some metals and other substances conduct electric […]
Quantum 6, 819 (2022). https://doi.org/10.22331/q-2022-09-22-819 Quantum key distribution, which allows two distant parties to share an unconditionally secure cryptographic key, promises to play an important role in the future of communication. For this reason such […]
Quantum 6, 818 (2022). https://doi.org/10.22331/q-2022-09-22-818 Entanglement is the defining characteristic of quantum mechanics. Bipartite entanglement is characterized by the von Neumann entropy. Entanglement is not just described by a number, however; it is also characterized […]
Quantum 6, 817 (2022). https://doi.org/10.22331/q-2022-09-22-817 We develop two general approaches to characterising the manipulation of quantum states by means of probabilistic protocols constrained by the limitations of some quantum resource theory. First, we give a […]
Quantum 6, 816 (2022). https://doi.org/10.22331/q-2022-09-22-816 Quantum many-body systems involving bosonic modes or gauge fields have infinite-dimensional local Hilbert spaces which must be truncated to perform simulations of real-time dynamics on classical or quantum computers. To […]
Quantum 6, 815 (2022). https://doi.org/10.22331/q-2022-09-22-815 We propose an extension to the Pauli stabiliser formalism that includes fractional $2pi/N$ rotations around the $Z$ axis for some integer $N$. The resulting generalised stabiliser formalism – denoted the […]
A few minutes into a 2018 talk at the University of Michigan, Ian Tobasco picked up a large piece of paper and crumpled it into a seemingly disordered ball of chaos. He held it up […]
An international team of physicists, with the participation of the University of Augsburg, has for the first time confirmed an important theoretical prediction in quantum physics. The calculations for this are so complex that they […]
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