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 […]
Quantum 6, 814 (2022). https://doi.org/10.22331/q-2022-09-22-814 Quantum technologies are moving towards the development of novel hardware devices based on quantum bits (qubits). In parallel to the development of quantum devices, efficient simulation tools are needed in […]
Quantum 6, 813 (2022). https://doi.org/10.22331/q-2022-09-21-813 We improve the planar honeycomb code by describing boundaries that need no additional physical connectivity, and by optimizing the shape of the qubit patch. We then benchmark the code using […]
Quantum 6, 812 (2022). https://doi.org/10.22331/q-2022-09-20-812 Optomechanical systems are rapidly becoming one of the most promising platforms for observing quantum behaviour, especially at the macroscopic level. Moreover, thanks to their state-of-the-art methods of fabrication, they may […]
Quantum 6, 811 (2022). https://doi.org/10.22331/q-2022-09-20-811 Recent work shows that quantum signal processing (QSP) and its multi-qubit lifted version, quantum singular value transformation (QSVT), unify and improve the presentation of most quantum algorithms. QSP/QSVT characterize the […]
Quantum 6, 810 (2022). https://doi.org/10.22331/q-2022-09-20-810 Maxwell’s Demon is at the heart of the interrelation between quantum information processing and thermodynamics. In this thought experiment, a demon generates a temperature gradient between two thermal baths initially […]
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