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Momentum-entangled atom pairs are used to demonstrate quantum non-locality, where changing one atom in an entangled pair instantly alters the state of the other atom. This result paves the way to study interactions between quantum states and gravity.

A distinctive population with high hunter-gatherer ancestry persisted 3,000 years later than in most European regions, contributing to later Lower Rhine–Meuse Bell Beaker users.

Multielectron quantum dots offer a promising platform for high-performance spin qubits; however, previous demonstrations have been limited to single-qubit operation. Here, the authors report a universal gate set and two-qubit Bell state tomography in a high-occupancy double quantum dot in silicon.

Silicon-based spin qubits are promising candidates for a scalable quantum computer. Here the authors demonstrate the violation of Bell’s inequality in gate-defined quantum dots in silicon, marking a significant advancement that showcases the maturity of this platform.

The laws of quantum mechanics make it possible to design device-independent security protocols that do not need trusted equipment. Now, explicit protocols are provided that achieve the optimal rate of device-independent random number generation.

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.

Researchers demonstrate that Bell's measure — a commonly used test of quantum nonlocality — can be used in classical optical schemes to separate incoherence associated with statistical fluctuations from incoherence based on correlation. This technique may be useful for quantum information applications such as classical optical coherence theory and optical signal processing.

An 11-qubit atom processor comprising two precision-placed nuclear spin registers of phosphorus in silicon is shown to achieve state-of-the-art Bell-state fidelities of up to 99.5%.

A Bell experiment that is ‘loophole’ free—leaving no room for explanations based on experimental imperfections—reveals a statistically significant conflict with local realism

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.

Quantum error correction codes protect quantum information, but running algorithms also requires the ability to perform gates on logical qubits. A lattice surgery scheme for fault-tolerant gates has now been demonstrated in a quantum repetition code.

Web summaryHarnessing the entanglement of different ionic species could bring new flexibility in quantum computing, and now two groups independently demonstrate entanglement between different atomic species; Ballance et al. achieve entanglement between different atomic isotopes, whereas the related paper by Tan et al. shows entanglement between different elements, together demonstrating a first step towards mixed-species quantum logic.

A M5 earthquake triggered the 2018 Sierra Negra eruption after 10 hours. Subsequent microseismicity revealed a cryptic fluid phase facilitated magma intrusion, highlighting that cascading processes are potentially essential for eruption initiations.

A violation of Bell's inequality, which is a direct proof of entanglement, can be observed in the solid state using the electron and nuclear spins of a single phosphorus atom in silicon.

Here it is shown, both theoretically and experimentally, that non-local correlations between entangled quantum particles can be used for a new cryptographic application — the generation of certified private random numbers — that is impossible to achieve classically. The results have implications for future device-independent quantum information experiments and for addressing fundamental issues regarding the randomness of quantum theory.

All-action archaeologist Daniel Davenport unpacks the country’s complex past from inside its vast national parks.

Bell’s theorem has important implications for quantum information processing. Here the authors experimentally investigate the violation of a Bell-like inequality in the case of distant parties whose correlations are mediated by independent sources, a realistic feature in future quantum networks.

Future quantum networks will require entangled photons operating in the telecommunications band, so they can integrate with existing architectures. Ward et al.present a quantum-dot-entangled-photon-pair source in this region and a method to measure the fidelity of a time-evolving Bell state.

Studying many-body quantum chaos on current quantum hardware is hindered by noise and limited scalability. Now it is shown that a superconducting processor, combined with error mitigation, can accurately simulate dual-unitary circuit dynamics.

Quantum phenomena can often be explored in a more accessible way by so called quantum analogues, making its understanding and applications more achievable. The authors experimentally realise acoustic Bell states by superposition of coupled 1D elastic waveguides, which allows them to explore a section of the Bell’s state Hilbert space by tuning the complex amplitude coefficients, opening options to exploring quantum entanglement with a classical equivalent from phononics.

Quantum information processing normally uses either discrete- or continuous-variable encoding. Here, the authors bridge the two approaches, showing how to entangle Schrodinger’s cats states by conversion between Bell states in the Fock and cat bases and by a simple Fock-state-like gate operation.

A study demonstrates a public generator of random numbers based on device-independent techniques, with the randomness being fully auditable and traceable.

A deterministic violation of the Bell inequality is reported between two superconducting circuits, providing a necessary test for establishing strong enough quantum entanglement to achieve secure quantum communications.

Astrophysicist who predicted that galaxies have black holes at their hearts.

While several advancements have been made in the use of on-demand solid-state quantum emitters for quantum communication, using them to realise a quantum relay among remote parties had not been realised so far. Here, the authors fill this gap by realising all-photonic quantum state teleportation with photons generated by distinct remote quantum dots.

Practical implementations of quantum communication need to securely deliver information over long distances without line-of-sight. Towards this goal, Cuevas et al.use an actively stabilized interferometer to close the geometry loophole for a Bell inequality violation over 1 km of optical fibre.

Quantum-dot-based single photon sources represent a promising resource for future quantum networks. Here, the authors realize all-photonic quantum teleportation using photons from two remote near-infrared-emitting quantum dots, using polarization-preserving quantum frequency converters to enable two-photon interference at telecom wavelength.

Diabetic ketoacidosis (DKA) is the leading cause of death, morbidity and excessive health-care utilization and costs in patients with type 1 diabetes mellitus; DKA is common at initial diagnosis, but uncommon thereafter. A new study has determined the risk factors for multiple DKA episodes and their relationship to the risk of death.

The treatment of Bell palsy remains a matter of debate. A recent update of the American Academy of Neurology practice parameter concluded that corticosteroids should be offered to increase the probability of facial nerve recovery. The benefits of antiviral treatment, however, have not been established.

The triangle causal structure represents a departure from the usual Bell scenario, as it should allow to violate classical predictions without the need for external inputs setting the measurement bases. Here the authors realise this scenario using a photonic setup with three independent photon sources.

Aperiodic composite crystals were discovered that emulate 2D moiré materials, demonstrating a potentially scalable approach for producing moiré materials for next-generation electronics and a generalizable approach for realizing theoretical predictions of higher-dimensional quantum phenomena.

According to Bell's theorem, any theory that is based on the joint assumption of realism and locality is at variance with certain quantum predictions. Here, theory and experiment agree that a class of such non-local realistic theories is incompatible with experimentally observable quantum correlations, suggesting that giving up the concept of locality is not sufficient to be consistent with quantum experiments, unless certain intuitive features of realism are abandoned.

Reconfigurable arrays of up to 448 neutral atoms are used to implement and combine the key elements of a universal, fault-tolerant quantum processing architecture and experimentally explore their underlying working mechanisms.

The emission of entangled photon pairs from layered materials is attractive for quantum applications, but its observation in monolayers has remained elusive. Here, the authors report co- and counter-propagating photon pair emission in the telecom range from monolayer GaSe and the observation of high-fidelity Bell states in the counterpropagating configuration.

Three BRAF inhibitors are used to treat melanoma and colorectal cancer. Here, the authors demonstrate that these drugs bind and activate the protein kinase GCN2, a previously unappreciated off-target effect that may modulate tumour cell responses.