Search

Bell inequalities are a quantitative measure that can distinguish classically determined correlations from stronger quantum correlations, and their measurement provides strong experimental evidence that quantum mechanics provides a complete description. The violation of a Bell inequality is now demonstrated in a solid-state system; the experiment provides further strong evidence that a macroscopic electrical circuit is really a quantum system.

Entangled particles some distance apart can be used to show the strikingly nonlocal nature of quantum mechanics. Here the authors generate spatially separated pairs of helium atoms by colliding Bose-Einstein condensates and show that they are entangled by observing nonlocal correlations.

Over 20 species of geographically and phylogenetically diverse bird species produce convergent whining vocalizations towards their respective brood parasites. Model presentation and playback experiments across multiple continents suggest that these learned calls provoke an innate response even among allopatric species.

The fair-sampling loophole is closed in a Bell inequality violation experiment with entangled photons, making the photon the first physical system for which all the main loopholes have been closed.

Lange, Ratz, et al. investigate the number and distribution of human prohibitin complexes in the mitochondrial inner membrane, uncovering their bell-shaped structure and assembly of alternating PHB1 and PHB2 molecules.

The authors report a meta-analysis of methylome-wide association studies, identifying 15 significant CpG sites linked to major depression, revealing associations with inflammatory markers and suggesting potential causal relationships through Mendelian randomization analysis.

Low-antigen-expressing cancers are a challenge to existing chimeric antigen receptor (CAR)-T cell-based therapies. Now, it has been shown that fusion of intrinsically disordered regions to CARs induces CAR condensation and enhances antigen sensitivity and killing activity of CAR-T cells.

The authors report on an experimental study of attosecond time delays of photoelectrons emitted from CO₂ molecules. This clarifies the role of internal dynamics of ions and ionelectron entanglement on the photoionization dynamics.

A nondestructive and complete Bell-state measurement is demonstrated between two 60-m-distant atomic qubits in different optical cavities. The main building block is a photon-atom gate, which is executed upon reflection of the photon from the cavity.

Oligodendrocytes are critical for brain myelination and repair. Here, the authors show that erythropoietin enhances oligodendrocyte lineage progression, promoting myelination through transcriptional regulation.

The BIG Bell Test, which used an online video game with 100,000 participants worldwide to provide random bits to 13 quantum physics experiments, contradicts the Einstein–Podolsky–Rosen worldview of local realism.

Using an optical resonator containing two individually addressable atoms in a single cavity, fusion of deterministically generated photonic graph states to create ring and tree graph states with up to eight qubits is demonstrated.

The oxygen evolution reaction proceeds over a surface that undergoes (frustrated) phase transitions to accommodate bias-dependent excess charge. Now it has been shown that this excess charge is intimately linked to the interfacial solvation of ions and the pre-organization of the transition state, providing insight into intrinsic catalyst activities.

Quantum steering is a form of quantum non-locality that can be verified for arbitrarily low detection efficiencies and high losses at the price of requiring complete trust in one of the parties. Here, Kocsis et al. present measurement-device-independent steering protocols that remove this need for trust.

Experimentally verifying that quantum states are indeed entangled is not always straightforward. With the recently proposed device-independent entanglement witnesses, genuine multiparticle entanglement of six ions has now been demonstrated.

Single, self-amplifying RNA molecules condensed by an oppositely charged polyelectrolyte self-assemble into compact globular nanoparticles that can be used as vaccines to generate potent immunological responses at low doses.

This study reveals that jellyfish swimming can be guided and predicted using electrical stimulation and machine learning, illustrating how embodied intelligence shapes both spontaneous and stimulus-evoked behaviors.

Using atomic force microscopy, Pan et al. show that cyclic nucleotide-gated ion channel SthK, which can be differentially activated by cAMP and cGMP, binds both cyclic nucleotides but only cAMP can access a deep-bound state that could be essential for cAMP-dependent channel activation.

Some patients experience long-lasting symptoms after coronavirus disease (COVID-19). Here the authors report the clinical and laboratory parameters in patients with post-COVID-19 syndrome from a prospective observational cohort study.

Spontaneous parametric down-conversion in thin films should allow to realise extremely compact entangled photon sources. Here, the authors generate entangled photon pairs from a 3R-MoS2 flake, characterize them via quantum state tomography, and show how to tune between different Bell state outputs by changing the pump polarization.

In 2000, Asher Peres put forward the paradoxical idea that entanglement could be produced after the entangled particles have been measured, even if they no longer exist. Researchers now experimentally demonstrate this idea using four photons.

The authors report signal enhancements in high-resolution liquid-state NMR by a new setup for dynamic nuclear polarization. Two-dimensional NMR techniques are used to transfer hyperpolarization within the nuclei of molecules such as metabolites or drugs.

De novo [2Fe-2S] cluster synthesis by the mitochondrial ISC complex requires electrons from ferredoxin-2 (FDX2). The authors map FDX2 binding to the core ISC complex, showing that FDX2 can bind in two possible conformations in a manner competitive with frataxin.

Combining high-speed AFM, single molecule recognition force spectroscopy, and molecular dynamics simulations Zhu, Canena, Sikora et al. characterize the interaction dynamics of the trimeric spike protein of SARS-CoV-2 wt, and delta and omicron variants with its entry receptor ACE2. While delta variant increases avidity by multivalent binding to ACE2, omicron variant shows an extended binding lifetime.

DNA rotaxanes can be prepared using a simple interlocking approach in which a DNA rod is threaded through a DNA macrocycle by base pairing.

Bloch oscillations consist of periodic spreading and relocalization of particle wave functions, but have been so far observed only in separable states. Here the authors observe them for two-photon N00N states in integrated photonic circuits, revealing transitions from particle bunching to anitbunching.

In a study performed in Schizosaccharomyces pombe, ‘closed mitosis’ is shown to occur via local disassembly of the nuclear envelope within the narrow bridge connecting segregating daughter nuclei, and a key role is identified for Les1, which restricts nuclear envelope breakdown to the bridge.

A system based on trapped rubidium atoms for generating quantum secure keys between distant users is presented, which could operate in a device-independent fashion.

Large quantum computers are likely to require methods of connecting devices by transmitting and absorbing photons. Entanglement between two superconducting qubit devices has now been established using a waveguide with tunable directionality.

Entanglement swapping—a protocol for entangling remote quantum systems without the requirement of direct interaction between them—has been implemented in a completely deterministic fashion, allowing to prepare well-defined entangled states on demand.

Many intracellular pathogens mimic extracellular matrix motifs to specifically interact with the host membrane which may influences virus particle uptake. Here authors use single molecule tension sensors to reveal the minimal forces exerted on single virus particles and demonstrate that the uptake forces scale with the adhesion energy.

Heralded entanglement between two independently trapped single rubidium atoms is generated over long telecom fibre links using quantum frequency conversion in an important step towards the realization of large-scale quantum network links.

Conductance histograms are common setups to study molecular junctions, but the dispersion of the signals makes it difficult to interpret at microscopic level. Here the authors develop a physical model of molecular junctions that connects this observable with molecular properties.

Octameric complexes of serine are long known for their special properties, such as their enhanced stability and preference for homochirality. Yet, there is no consensus on their structures. Now, experimental data on the serine octamer–dichloride complex is presented that supports a highly symmetrical, highly stable structure.

It is challenging to reduce the size of untethered swimming robots whilst keeping their multiple manipulation and other functions. Ren et al. achieve this goal using a jellyfish-inspired soft millirobot design in an oscillating magnetic field, which can be operated in fluids with moderate Reynolds numbers.

The history of human populations in the islands of the central and western Mediterranean is poorly understood. Here, the authors generate ancient-DNA data from the Balearic Islands, Sicily and Sardinia, and estimate the level and timing of steppe pastoralist, Iranian and North African ancestries in these populations.

Examination of demographic age trajectories for species from a wide range of taxonomic groups shows that these species have very diverse life-history patterns; mortality and reproduction vary greatly with age for both long- and short-lived species, and the relationships between ageing, mortality and reproduction are clearly complex.

Single atoms in optical cavities in two separate laboratories are the nodes of an elementary quantum network, in which quantum information is distributed via the controlled emission and absorption of single photons.

Violation of the classical bound of the three-particle Mermin inequality by nine standard deviations is experimentally demonstrated by closing both the locality and freedom-of-choice loopholes; only the fair-sampling assumption is required. To achieve this, a light source for producing entangled multiphoton states and measurement technologies for precise timing and efficient detection were developed.

Coherent transfer of an optical photon polarization state to a single nuclear spin in a nitrogen–vacancy defect centre in diamond is demonstrated without a high-finesse cavity. A storage time of 10 s is achieved with a transfer fidelity of 98%.

By reflecting light from a relativistically moving mirror, its frequency can be changed, which could create X-rays from visible light. Kiefer et al. make such a mirror from relativistic electrons formed by an intense laser striking a nanofoil, and shift a laser pulse from the infrared to the extreme ultraviolet.