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Intrinsic magnetism in superconducting infinite-layer nickelates

Nature Physics - Δευ, 01/08/2022 - 00:00

Nature Physics, Published online: 01 August 2022; doi:10.1038/s41567-022-01684-y

Measurements of four different infinite-layer nickelates show that magnetic behaviour coexists with superconductivity. This is different from what is seen in cuprates, giving a strong distinction between the two classes of oxide superconductors.

Realizing coherently convertible dual-type qubits with the same ion species

Nature Physics - Δευ, 01/08/2022 - 00:00

Nature Physics, Published online: 01 August 2022; doi:10.1038/s41567-022-01661-5

Quantum computing with trapped ions requires qubits that can store and manipulate quantum information, and others that can be used for destructive incoherent operations. Different states of ytterbium-171 ions can be used to realize both qubit types

Classically verifiable quantum advantage from a computational Bell test

Nature Physics - Δευ, 01/08/2022 - 00:00

Nature Physics, Published online: 01 August 2022; doi:10.1038/s41567-022-01643-7

Interactive protocols can verify that a quantum computer exhibits a computational speedup using only classical analysis of its output. Exploiting a connection to Bell’s theorem gives a simpler protocol that is much less demanding for experiments.

20 years of network community detection

Nature Physics - Παρ, 29/07/2022 - 00:00

Nature Physics, Published online: 29 July 2022; doi:10.1038/s41567-022-01716-7

A fundamental technical challenge in the analysis of network data is the automated discovery of communities — groups of nodes that are strongly connected or that share similar features or roles. In this Comment we review progress in the field over the past 20 years.

Thouless pumping of light with a twist

Nature Physics - Πέμ, 28/07/2022 - 00:00

Nature Physics, Published online: 28 July 2022; doi:10.1038/s41567-022-01675-z

An experiment with photonic waveguides demonstrates the connection between non-Abelian holonomies and adiabatic particle transport, paving the way to the geometric and topological control of light trajectories.

Non-Abelian Thouless pumping in photonic waveguides

Nature Physics - Πέμ, 28/07/2022 - 00:00

Nature Physics, Published online: 28 July 2022; doi:10.1038/s41567-022-01669-x

Non-Abelian Thouless pumping, whose outcome depends on the order of pumping operations, has been observed in photonic waveguides with degenerate flat bands.

Transepithelial potential difference governs epithelial homeostasis by electromechanics

Nature Physics - Πέμ, 28/07/2022 - 00:00

Nature Physics, Published online: 28 July 2022; doi:10.1038/s41567-022-01657-1

Epithelial tissues such as those in the gut or skin are strongly polar, generating electric fields that play a role in wound healing and nutrient transport. Changing the field direction in a layer of tissue disrupts its homeostatic stability.

Chiral cavity quantum electrodynamics

Nature Physics - Πέμ, 28/07/2022 - 00:00

Nature Physics, Published online: 28 July 2022; doi:10.1038/s41567-022-01671-3

Edge modes in chiral topological systems can carry quantum information without backscattering. A topological lattice of superconducting resonators has been coupled to a qubit, providing a platform for chiral quantum electrodynamics and communication.

Ruffled in water, smooth in honey

Nature Physics - Δευ, 25/07/2022 - 00:00

Nature Physics, Published online: 25 July 2022; doi:10.1038/s41567-022-01664-2

Cells can sense the mechanical properties of their environment. By adjusting the ruffling of their membranes, cells respond to different viscosities of their surrounding liquid medium.

A broken translational symmetry state in an infinite-layer nickelate

Nature Physics - Δευ, 25/07/2022 - 00:00

Nature Physics, Published online: 25 July 2022; doi:10.1038/s41567-022-01660-6

Unconventional superconductivity is often associated with the presence of other kinds of electronic order. Observations of charge order in infinite-layer nickelate superconductors show that they fit this pattern.

Membrane ruffling is a mechanosensor of extracellular fluid viscosity

Nature Physics - Δευ, 25/07/2022 - 00:00

Nature Physics, Published online: 25 July 2022; doi:10.1038/s41567-022-01676-y

Living cells change their behaviour in response to the viscosity of the medium surrounding them. An in vitro study shows that cells spread wider and move faster in a highly viscous medium, provided they have an actively ruffling lamellipodium.

Transition from sub-Rayleigh anticrack to supershear crack propagation in snow avalanches

Nature Physics - Δευ, 25/07/2022 - 00:00

Nature Physics, Published online: 25 July 2022; doi:10.1038/s41567-022-01662-4

Avalanches can occur when a porous snow layer lies beneath a dense cohesive snow slab. Field experiments and simulations now reveal different crack-propagation regimes in slab avalanches, similar to rupture propagation following an earthquake.

Limits to economic growth

Nature Physics - Πέμ, 21/07/2022 - 00:00

Nature Physics, Published online: 21 July 2022; doi:10.1038/s41567-022-01652-6

Across the world, decisions on investment and policy are made under the assumption of continuous economic expansion. Fundamental physical limits may soon put an end to this phase of development, as foreshadowed by the 1972 report The Limits to Growth.

A universal qudit quantum processor with trapped ions

Nature Physics - Πέμ, 21/07/2022 - 00:00

Nature Physics, Published online: 21 July 2022; doi:10.1038/s41567-022-01658-0

Qudits are generalizations of qubits that have more than two states, which gives them a performance advantage in some quantum algorithms. The operations needed for a universal qudit processor have now been demonstrated using trapped ions.

Thermally reconfigurable random lasers

Nature Physics - Πέμ, 14/07/2022 - 00:00

Nature Physics, Published online: 14 July 2022; doi:10.1038/s41567-022-01665-1

Colloidal random lasers are hard to design and control. Combining optically controlled micro-heaters with thermophilic particles attracted by them leads to microlasers with programmable and reversible patterns.

Self-organized lasers from reconfigurable colloidal assemblies

Nature Physics - Πέμ, 14/07/2022 - 00:00

Nature Physics, Published online: 14 July 2022; doi:10.1038/s41567-022-01656-2

Experiments inspired by the behaviour of active matter show that an external optical stimulus can spatially reconfigure colloidal random lasers and continuously tune their lasing threshold.

Long-lived phantom helix states in Heisenberg quantum magnets

Nature Physics - Πέμ, 14/07/2022 - 00:00

Nature Physics, Published online: 14 July 2022; doi:10.1038/s41567-022-01651-7

In generic quantum many-body systems, initial configurations far from equilibrium are expected to undergo general thermalization. An experiment with ultracold atoms now shows evidence of a class of spin-helix states that evade such behaviour.

Time-reversal-based quantum metrology with many-body entangled states

Nature Physics - Πέμ, 14/07/2022 - 00:00

Nature Physics, Published online: 14 July 2022; doi:10.1038/s41567-022-01653-5

The standard quantum limit bounds the precision of quantum measurements. Now, a protocol based on time-reversal operations with cold atoms overcomes that limit and achieves the greatest phase sensitivity improvement in any full Ramsey interferometer.

Fluid dances to the cilia beat

Nature Physics - Τρί, 12/07/2022 - 00:00

Nature Physics, Published online: 12 July 2022; doi:10.1038/s41567-022-01687-9

Fluid dances to the cilia beat

Caught by a whisker

Nature Physics - Τρί, 12/07/2022 - 00:00

Nature Physics, Published online: 12 July 2022; doi:10.1038/s41567-022-01685-x

Caught by a whisker

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Πανεπιστήμιο Κρήτης - Τμήμα Φυσικής - Πανεπιστημιούπολη Βουτών - TK 70013 Βασιλικά Βουτών, Ελλάδα
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