Quantum networks play an extremely important role in quantum information science, with
application to quantum communication, computation, metrology, and fundamental tests. One …

Realizing a long coherence time quantum memory is a major challenge of current quantum
technology. Until now, the longest coherence-time of a single qubit was reported as 660 s in …

We demonstrate remote entanglement of trapped-ion qubits via a quantum-optical fiber link
with fidelity and rate approaching those of local operations. Two Sr+ 88 qubits are entangled …

Quantum information processing systems rely on a broad range of microwave technologies
and have spurred development of microwave devices and methods in new operating …

We integrate a long-lived memory qubit into a mixed-species trapped-ion quantum network
node. Ion-photon entanglement first generated with a network qubit in Sr+ 88 is transferred …

We use electronic microwave control methods to implement addressed single-qubit gates
with high speed and fidelity, for Ca+ 43 hyperfine “atomic clock” qubits in a cryogenic (100 …

One of the most formidable challenges of scaling up quantum computers is that of control-
signal delivery. Today's small-scale quantum computers typically connect each qubit to one …

Applied quantum optics stands to revolutionise many aspects of information technology,
provided performance can be maintained when scaled up. Silicon quantum photonics …

The central challenge of quantum computing is implementing high-fidelity quantum gates at
scale. However, many existing approaches to qubit control suffer from a scale-performance …

We implement a two-qubit logic gate between a Ca 43+ hyperfine qubit and a Sr 88+
Zeeman qubit. For this pair of ion species, the S–P optical transitions are close enough that …