The future development of quantum technologies relies on creating and manipulating
quantum systems of increasing complexity, with key applications in computation, simulation …

Quantum machine learning is a rapidly growing field at the intersection of quantum
technology and artificial intelligence. This review provides a two-fold overview of several key …

We report on an elementary quantum network of two atomic ions separated by 230 m. The
ions are trapped in different buildings and connected with 520 (2) m of optical fiber. At each …

Nuclear spins were among the first physical platforms to be considered for quantum
information processing,, because of their exceptional quantum coherence and atomic-scale …

Gate set tomography (GST) is a protocol for detailed, predictive characterization of logic
operations (gates) on quantum computing processors. Early versions of GST emerged …

Owing to the inevitable loss in communication channels, the distance of entanglement
distribution is limited to approximately 100 kilometres on the ground. Quantum repeaters can …

Optical quantum states based on entangled photons are essential for solving questions in
fundamental physics and are at the heart of quantum information science. Specifically, the …

Controlling the various degrees‐of‐freedom (DoFs) of structured light at both quantum and
classical levels is of paramount importance in optics. It is a conventional paradigm to treat …

With the rapid development of quantum technologies, a pressing need has emerged for a
wide array of tools for the certification and characterization of quantum devices. Such tools …

Now that it is possible to achieve measurement and control fidelities for individual quantum
bits (qubits) above the threshold for fault tolerance, attention is moving towards the difficult …