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Experiments demonstrate a quantum-coherence-induced power increase for quantum heat engines over their classical counterparts.

Viewpoint on:
James Klatzow et al.
Phys. Rev. Lett. 122, 110601 (2019)

Experimentalists realize a Bose-Einstein condensate on a 2D quasicrystal optical lattice, opening the path for simulations of a variety of quantum many-body phenomena in these fractal structures.

Viewpoint on:
Konrad Viebahn et al.
Phys. Rev. Lett. 122, 110404 (2019)

Twelve superconducting qubits are entangled, forming a linear cluster state, by using a carefully calibrated sequence of single and 2-qubit quantum gates.

A new device removes the time-energy correlation or energy chirp on a plasma wakefield, reducing the overall energy spread of the beam.

Calcu­lations uncover the neutron-scattering signature of the magnetic monopoles that propagate through quantum spin ices.

Synopsis on:
Masafumi Udagawa and Roderich Moessner
Phys. Rev. Lett. 122, 117201 (2019)

Tokamak experiments show that confining the plasma in an elongated inverse D-shape could reduce energy transport at reactor-relevant plasma pressure without disruptive instabilities.

An hourglass nodal line observed in a nonsymmorphic photonic crystal is immune to symmetry preserving perturbation and provides an ideal robust platform for photonic applications.

The angles at which flat bands emerge to produce superconductivity in twisted bilayer graphene are shown to be fundamentally connected to quantum Hall wave functions.

A thunderstorm probed with atmospheric muons had an electric potential exceeding one billion volts, much higher than values measured previously.  

Focus story on:
B. Hariharan et al.
Phys. Rev. Lett. 122, 105101 (2019)

High precision determination of the molecular hydrogen dissociation energy is now sensitive to the finite size of the proton.

A drop bouncing on a liquid stores information in a wave and rereads it later.

Top: Surfaces composed of past wavefronts emitted by a source moving along a circular path at two different Mach numbers. Bottom: Projections along the time direction of the cones immediately above. Thick black arcs show source trajectories. The dashed line marks the position of an observer, with colored lines marking wavefronts that intersect at this position.