Perspective The wisdom in the qubit Giannicola Scarpa, Quantum Views 8, 82 (2024). Prologue Inverness, 11th century. Macbeth sits in front of his quantum computer, his hands shaking, a drop of sweat falling on his forehead. He types. $\textbf{Macbeth:}$ “What shall I do?''…
Perspective A new way to analyze entanglement buffering Julia Kunzelmann, Quantum Views 8, 81 (2024). One of the main challenges of realizing quantum networks is providing entangled links between end nodes over larger distances. Due to noise, distributing high-quality entangled qubit pairs i…
Perspective A new take on permutation-invariant quantum codes Yingkai Ouyang, Quantum Views 8, 80 (2024). A brief history Quantum error-correction codes enable the correction of errors by encoding quantum information into a larger Hilbert space. A particularly intriguing set of states to conside…
Perspective Performing Continuous Measurements on Coherent Spin States Robert Mann, Quantum Views 8, 79 (2024). Coherent states have long played an important role in physics, ever since Glauber pointed out their utility in quantum optics. They are the unique eigenstates of the annihilation operator of…
Perspective Diagrams and GPTs for Quantum Gravity Andrea Di Biagio, Quantum Views 8, 78 (2024). What's new? In their new article [1], Thomas Galley, Flaminia Giacomini, and John Selby, formalise and prove, within the framework of Generalised Probabilistic Theories (GPT), that if quantu…
Perspective Towards real-world implementations of quantum machine learning Junyu Liu, Quantum Views 7, 77 (2023). Quantum machine learning, which involves algorithms akin to machine learning operating on quantum devices, is anticipated to be a flagship application for quantum technologies. In the short…
Perspective The classical price tag of entangled qubits Armin Tavakoli, Quantum Views 7, 76 (2023). Bell’s theorem famously proclaims that there exists no local hidden variable (LHV) model for quantum theory. This takes place in a scenario where Alice and Bob share an entangled pair of par…
Perspective Perspective on “Circuits of space and time quantum channels” Shane Dooley, Quantum Views 7, 75 (2023). Summary Throughout the history of physics, exactly solvable models have provided valuable insight into various physical phenomena [1]. Conventional wisdom says that exact solutions are usual…
Perspective Tailoring randomized-measurement schemes for practical devices Pei Zeng, Quantum Views 7, 74 (2023). We live in a quantum world, yet, our everyday experiences seem to present themselves in terms of classical information. To examine large quantum systems, we can obtain classical information…
Perspective Information erasure through quantum many-body effects Marcus V. S. Bonança, Quantum Views 7, 73 (2023). The problem of quantifying the thermodynamic cost of bit erasure has received a great attention since its first proposal [1,2]. Its relation with previously considered problems of the thermo…
Editorial Quantum Decision Making Nicolai Friis, Quantum Views 7, 72 (2023). No, what you are about to read is not about the latest quantum-research band waggon to jump on. Instead, this editorial is intended to give an inside view on the editorial process at Quantum…
Perspective Universality in quantum snapshots Pieter W. Claeys, Quantum Views 7, 71 (2023). Thermalization and random matrices One of the main challenges in quantum mechanics lies in understanding the dynamical behaviour of many-body systems. How do isolated quantum systems relax t…
Perspective Extending Quantum topological data analysis to persistent homology Sam McArdle, Quantum Views 7, 70 (2023). It is an open challenge to design quantum algorithms for machine learning that do not need access to large amounts of data – the efficient loading of which would require challenging-t…
Perspective High-performance Photonic Entanglement Generation Xiongfeng Ma, Quantum Views 6, 69 (2022). Background With decades of development progress in quantum science and technology, we are at the dawn of entanglement-based quantum networks [1]. Theoretical research has gone deep into the…
Perspective Quantum thermal machines: a simple scheme with realistic bath modelling Felipe Barra, Quantum Views 6, 68 (2022). Thermal machines interact with two or more heat reservoirs to perform work on a third system or use work to cool down the hot reservoir. In the first case, the machine works as an engine, an…
Perspective A Quantum Theory for Bose–Einstein Condensation of the Ideal Gas Fabrice P. Laussy, Quantum Views 6, 67 (2022). Historical background: insights of a genius. The achievements of Einstein in formulating the laws governing nothing short of space and time are so monumental that they often overshadow his…