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Research news in Condensed Matter and Quantum Optics

Kinesin  walking - Image :

Inferring entropy production from short time series

Recent research at Fysikum, published in Physical Review Letters, discovers a simple method to quantify dissipation in microscopic non-equilibrium systems by analysing short time series data.

twisted graphene systems

New Twist on Strongly Correlated Quantum Matter

Exotic new states of quantum matter form in twisted graphene systems, according to research from Fysikum published as Editors’ suggestion in Physical Review Letters.

”trapped ions (Azote)”: Dualiteten hos fångad jon- och Rydbergatom-kvantteknologi. Fångade Rydbergjoner kombinerar styrkorna hos två mycket olika kvantprocessorer: fångad jon (ovan) och Rydbergatom (nedan) i en och samma teknik. Tekniken har potential att öka hastigheten hos fångade jonkvantdatorer. Illustration: Elsa Wikande /Azote.

Speeding-up quantum computing using giant atomic ions

Trapped Rydberg ions can be the next step towards scaling up quantum computers to sizes where they can be practically usable, a new study in Nature shows.

film quantum measurement

Filming a quantum measurement

Does a quantum state collapse instantly during measurement? And if not, how much time does the measurement process take and what is the quantum state of the system at any intermediate step?

Corner states of light in photonic waveguides

Corner States of Light

Researchers at Stockholm University have managed to create a new kind of light wave whose unique properties may become important e.g. in future communication technology. In a recently published article in Nature Photonics, they have shown how ideas from theoretical quantum and materials physics can be realised in a completely different context, namely in optical waveguides.

Revealing the quantum energy scale of light-matter interaction in a thermodynamic limit-FIG2

Revealing the quantum energy scale of light-matter interaction in a thermodynamic limit

In this work, we approach a limit probing the nature of light-matter interaction with strong coupling, revealing the significance of quantum fluctuations. We monitor the output channel of a paradigmatic oscillator in quantum optics, described by the Jaynes-Cummings model, subject to an imposed coherent driving field. Drive and decay create the landscape in which the quantum and classical frames are intertwined.

Figure 1: A colloidal particle in an optical trap (shown as a red ball), in the presence of thermal noise, can be made to work as a microscopic machine or heat engine. Its fluctuations have some typical features, some of which are shown here. Ref: Phys. Rev. Lett. 122, 140601

Efficiency fluctuations in microscopic machines

Results of a recent study by physicists from Stockholm University in collaboration with researchers at Nordita and the University of Bielefeld, provide a general understanding of the efficiency fluctuations in microscopic machines.

Steering is an essential feature of non-locality in quantum theory 2

Steering is an essential feature of non-locality in quantum theory

A physical theory is called non-local when observers can produce instantaneous effects over distant systems. Non-local theories rely on two fundamental effects: local uncertainty relations and steering of physical states at a distance. In quantum mechanics, the former one dominates the other in non-local games. A new study proved that the entanglement-based steering also plays an important role.

non-Hermitian Chern insulator

Topology of non-Hermitian systems unraveled

The study of topological materials has been an important task in condensed matter physics over the past few decades and was the subject of the 2016 Nobel prize in physics. Recent experiments and theoretical works have shown that unexpected phenomena occur in many open, non-equilibrium and complex systems that can be described using non-Hermitian physics.

Ana Predojevic and Markus Hennrich

Two prestigious Quantum Technology grants for Fysikum

Fysikum has been very successful in the highly competitive QuantERA ERA-NET Cofund call in Quantum Technologies. Two proposals coordinated by Ana Predojevic and Markus Hennrich, at Fysikum, Stockholm University have been selected for funding.

From the blog

KOMKO division

Condensed Matter and Quantum Optics division

Head of division

Eddy Ardonne
Room C5:3025
Tel: +46 (0)8 5537 8596