Qubits articles from across Nature Portfolio

The complex energy surface of a non-Hermitian system is not single-valued, and windings around its so-called exceptional branching points lead to the chiral and non-reciprocal transfer of eigenstates. Here, the authors experimentally demonstrate such topological state transfers in trapped ion systems, which are being established as promising platforms for quantum simulation.

Multiplexed entanglement distribution in a quantum network, with each node comprising multiple solid-state emitters in nanophotonic cavities, enables scalable quantum communication.

Controlling qubit–phonon interactions is crucial for solid-state quantum devices. Two recent studies demonstrate that phononic bandgap engineering can alter these interactions, leading to enhanced qubit coherence and scalability.

Large-scale control electronics, operating at cryogenic temperatures, are needed to run practical quantum computers. But scaling such electronics means addressing substantial challenges related to power consumption.

Many important models in theoretical physics — including the standard model of particle physics — are governed by local ‘gauge’ symmetries. Now, a quantum computer has successfully simulated a lattice gauge theory by leveraging this rich symmetry structure.

In a device comprising two double quantum dots separated by a 250-μm-long superconducting resonator, virtual photons in the resonator are shown to mediate the coupling of electron spins between the quantum dots. When the spin–spin coupling is activated for a controlled duration, oscillations between the spins are observed.

Superconducting qubits can be fabricated and controlled in large numbers, which makes them an appealing platform for quantum simulations of many-body physics. However, a scalable way of implementing electromagnetism has been lacking — until now.

Semiconductor spin qubits are usually highly localized, which makes it difficult to engineer long-range interactions. Two recent experiments demonstrate that adding superconductivity makes supercurrent-based long-range coupling possible.