Quantum

Quantum Views publishes Perspectives, Editorials, and Leaps on research papers and other issues of relevance for Quantum.

Perspective

Quantum channels look simpler if you squint

Jonas Helsen,

Quantum Views 3, 22 (2019).

One of the basic tools in any quantum information theorist is the completely positive trace preserving map, or quantum channel. They provide a general framework for discussing the dynamics a…

Perspective

Framework for Hamiltonian simulation and beyond: standard-form encoding, qubitization, and quantum signal processing

Su Yuan,

Quantum Views 3, 21 (2019).

Simulating the Hamiltonian dynamics of a quantum system is one of the most promising applications of quantum computers. Indeed, the idea of quantum computers, suggested by Feynman [1] and Ma…

Perspective

Quantum refrigerators – the quantum thermodynamics of cooling Bose gases

Sebastian Deffner,

Quantum Views 3, 20 (2019).

We are living in exciting times. All around the globe national as well as international entities have founded "quantum initiatives", whose goal is the development of practical and commercial…

Perspective

Simulating lossy multiphoton linear optics experiments

Alex Neville,

Quantum Views 3, 19 (2019).

A significant research effort is being made to develop near-term quantum devices which fall short of fault-tolerance requirements and the ability to perform universal computation, but are ab…

Perspective

Quantum adiabatic theory ventures into zeno dynamics

Martin Fraas,

Quantum Views 3, 18 (2019).

Quantum adiabatic theory has been developing through a productive interplay between applications in physics and formalisation in mathematics. It originated in the work of Born and Fock [1] o…

Perspective

What can we learn from trivial measurements?

Marius Krumm,

Quantum Views 3, 17 (2019).

The discovery of quantum mechanics radically changed our understanding of the world. Today, trying to reveal the mysteries of quantum mechanics has become one of the most fruitful fields of…

Perspective

The Page-Wootters mechanism 36 years on: a consistent formulation which accounts for interacting systems

Mischa Woods,

Quantum Views 3, 16 (2019).

Do we need dynamics to explain quantum systems which change over time? In closed systems, this is indeed the case — quantum systems evolve according to the Schrödinger equation in non-relati…

Perspective

The importance of being spectral

Alessandro Bisio,

Quantum Views 3, 15 (2019).

The spectral theorem, a major result in functional analysis, states that any normal (A linear operator is normal if it is closed, densely defined, and it commutes with its adjoint.) operator…

Perspective

Breaking barriers: photon-blockade breakdown from the few quanta to the thermodynamic limit

Ricardo Gutiérrez-Jáuregui,

Quantum Views 3, 14 (2019).

Photon blockade has become an iconic example of quantum optics in the strong coupling regime, where coherent dynamics dominate over dissipation, and properties that we have come to associate…

Perspective

Quantum signatures in fluctuation theorems

Martí Perarnau-Llobet,

Quantum Views 3, 13 (2019).

Fluctuation theorems play a central role in our understanding of the thermodynamics of small systems (see e.g. the review [1]). In particular, Crooks' fluctuation theorem relates the probabi…

Perspective

Measuring correlations in quantum systems

Daniel Manzano,

Quantum Views 3, 12 (2019).

Correlations are determinant to many physical processes. Many different topics such as phase transitions, magnetism, and Bell's inequalities can be analysed by the use of correlations. The c…

Leap

Single-molecule spintronics, or how to measure the magnetic state of a single atomic nucleus

Joana T. Coutinho, Salvador Cardona-Serra, and Alejandro Gaita-Ariño,

Quantum Views 2, 11 (2018).

What is “Spintronics”? Imagine that you could store all the human knowledge in a single USB flash drive. Now imagine that you could access and select all that information as fast as you thin…

Leap

Sensing magnetic fields with diamonds and green laser light

Louise F. Frellsen and Sepehr Ahmadi,

Quantum Views 2, 10 (2018).

Nitrogen-Vacancy (NV) centres in diamonds have quantum properties that allow them to sense weak magnetic fields. This is relevant both for research and health care as diamond magnetom…

Leap

How to build internet for quantum computers

Ondřej Černotík,

Quantum Views 2, 9 (2018).

I am sitting at my computer and writing an article. When I finish and decide to publish it, a chain of events will start. First, my computer will take the electric signals encoding the words…

Leap

A simple demonstration of incompatibility of measurements

Martin Plávala,

Quantum Views 2, 8 (2018).

The incompatibility of measurements is a strange feature of Quantum theory that forbids us from performing two measurements at the same time. Usually presented in the form of Heisenberg’s un…

Leap

Zooming into superconductors

Jayadev Vijayan,

Quantum Views 2, 7 (2018).

The game: minimizing energy Imagine I give you six balls, three red and three blue, and ask you to arrange them in a line. The only rule is that whenever two balls of the same colour are nex…

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