Perspective – Page 4 – Quantum

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

How good is a positive map at detecting quantum entanglement?

Ion Nechita,

Quantum Views 3, 24 (2019).

Since the dawn of quantum mechanics, entanglement has been a central notion of the theory [18], a very important body of work being dedicated to understanding, classifying, measuring, and ch…

Deducing entanglement from signal fluctuations

Alain Sarlette,

Quantum Views 3, 23 (2019).

The paper by Elouard et al, 2019 [1], considers the heralded entanglement between two qubits, from a continuous-time measurement that creates this entanglement. While the process is well-kno…

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…

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…

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…

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…

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…

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…

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…

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…

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…

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…

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…

Peer-review at Quantum – analyzing the data

Christian Gogolin,

Quantum Views 2, 5 (2018).

Many of you asked: "How long does it take to get published in Quantum?" We at Quantum are equally curious, as we want to provide the community with the most efficient peer-review process tha…

The dawn of quantum programming

Neil J. Ross,

Quantum Views 2, 4 (2018).

Seminal work in the field of quantum programming was done at the turn of the century but these investigations were often restricted to theoretical studies and toy programming languages [1,2]…

Figure by Lídia del Rio

Causality: relaxing before exploring

Paul Skrzypczyk,

Quantum Views 1, 3 (2017).

The results of measurements performed locally on entangled quantum systems shared among multiple parties can be correlated in ways which are inexplicable by any classical mechanism. This phe…