Experimental Semi-quantum Key Distribution With Classical Users

Francesco Massa, Preeti Yadav, Amir Moqanaki, Walter O. Krawec, Paulo Mateus, Nikola Paunković, André Souto, and Philip Walther,

Quantum 6, 819 (2022).

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 r…

Sarah True and Alioscia Hamma,

Quantum 6, 818 (2022).

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;…

Bartosz Regula,

Quantum 6, 817 (2022).

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. Fir…

Yu Tong, Victor V. Albert, Jarrod R. McClean, John Preskill, and Yuan Su,

Quantum 6, 816 (2022).

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 class…

Mark A. Webster, Benjamin J. Brown, and Stephen D. Bartlett,

Quantum 6, 815 (2022).

We propose an extension to the Pauli stabiliser formalism that includes fractional $2\pi/N$ rotations around the $Z$ axis for some integer $N$. The resulting generalised stabiliser formalism – den…

Stavros Efthymiou, Marco Lazzarin, Andrea Pasquale, and Stefano Carrazza,

Quantum 6, 814 (2022).

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 tool…

Craig Gidney, Michael Newman, and Matt McEwen,

Quantum 6, 813 (2022).

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…

Lewis A. Clark, Bartosz Markowicz, and Jan Kołodyński,

Quantum 6, 812 (2022).

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-a…

Zane M. Rossi and Isaac L. Chuang,

Quantum 6, 811 (2022).

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 al…

Guilherme L. Zanin, Michael Antesberger, Maxime J. Jacquet, Paulo H. Souto Ribeiro, Lee A. Rozema, and Philip Walther,

Quantum 6, 810 (2022).

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 t…

Enes Aybar, Artur Niezgoda, Safoura S. Mirkhalaf, Morgan W. Mitchell, Daniel Benedicto Orenes, and Emilia Witkowska,

Quantum 6, 808 (2022).

In this work, we study temperature sensing with finite-sized strongly correlated systems exhibiting quantum phase transitions. We use the quantum Fisher information (QFI) approach to quantif…

Zhenning Liu and Alexandru Gheorghiu,

Quantum 6, 807 (2022).

A proof of quantumness is a type of challenge-response protocol in which a classical verifier can efficiently certify the $\textit{quantum advantage}$ of an untrusted prover. That is, a quantu…

Paul K. Faehrmann, Mark Steudtner, Richard Kueng, Mária Kieferová, and Jens Eisert,

Quantum 6, 806 (2022).

Quantum simulation, the simulation of quantum processes on quantum computers, suggests a path forward for the efficient simulation of problems in condensed-matter physics, quantum chemistry,…

Ciaran McDonnell and Beatriz Olmos,

Quantum 6, 805 (2022).

We analyze the topological and dynamical properties of a system formed by two chains of identical emitters coupled to a waveguide, whose guided modes induce all-to-all excitation hopping. We…

Enrico Fontana, M. Cerezo, Andrew Arrasmith, Ivan Rungger, and Patrick J. Coles,

Quantum 6, 804 (2022).

Very little is known about the cost landscape for parametrized Quantum Circuits (PQCs). Nevertheless, PQCs are employed in Quantum Neural Networks and Variational Quantum Algorithms, which m…