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Andrew Daley discusses how analogue quantum simulation brought different physics subdisciplines, theorists and experimentalists together.

Deterministic generation of photonic multi-partite entangled states has previously been achieved for specific states using ad-hoc devices. Here, the authors present a single superconducting circuit device to deterministically generate a variety of states, namely W, GHZ, and cluster states.

The realization of the fractional quantum Hall effect with ultracold atoms in optical lattices is much sought after. Here, the authors propose a new way of obtaining fractional quantum Hall states in lattice systems by transforming a nonlocal abstract model into an implementable scheme.

Atoms can exhibit wave-like behaviour to form matter waves. Such waves have been used to model the basic processes that underpin how light interacts with matter, providing an experimental platform for future research.

Analogue quantum simulators have looser requirements than digital ones, but rigorous results on their usefulness in the noisy case are few. Here, the authors conclude that analogue quantum simulators are robust to errors and can provide superpolynomial to exponential quantum advantage when used to compute relevant many-body observables.

Networks have been widely explored in the context of classical statistical mechanics. But when quantum effects are added, qualitatively different behaviours emerge, even for the simplest cases.

The long-term promises of quantum simulators are far-reaching. The field, however, also needs clearly defined short-term goals.

Quantum optics is a well-established field that spans from fundamental physics to quantum information science. In the coming decade, areas including computation, communication and metrology are all likely to experience scientific and technological advances supported by this far-reaching research field.

Quantum mechanics has potential applications in communication and computation. But first a quantum connection — known as entanglement — has to be created between bigger and bigger objects.

In quantum information science, dissipation is commonly viewed as an adverse effect that destroys information through decoherence. But theoretical work shows that dissipation can be used to drive quantum systems to a desired state, and therefore might serve as a resource in quantum computations.

An analogue quantum simulator based on ultracold atoms in optical lattices and cavity quantum electrodynamics is proposed for the solution of quantum chemistry problems and tested numerically for a simple molecule.

Perfect State Transfer is known to time-optimally connect distant nodes in a network. Here, the authors implement it on a chain of superconducting qubits and demonstrate that it also serves as a powerful tool for generating multi-qubit entanglement.

A violation of Bell’s inequality would prove that a classical deterministic view of the universe is incorrect; however, despite long-standing efforts, irrefutable experimental proof of such a violation has yet to be produced. Teo et al. propose a realistic scenario that may finally overcome this challenge.

Tensor network states efficiently parametrize many-body quantum ground states and entanglement properties of strongly correlated systems. Here, the authors show how the presence of anyons and topological order can be related to symmetry breaking in the virtual boundary theory of the network.

A type of stochastic neural network called a restricted Boltzmann machine has been widely used in artificial intelligence applications for decades. They are now finding new life in the simulation of complex wavefunctions in quantum many-body physics.