The great promise of quantum computers comes with the dual challenges of building them
and finding their useful applications. We argue that these two challenges should be …

The past few years have witnessed the concrete and fast spreading of quantum
technologies for practical computation and simulation. In particular, quantum computing …

Enhancing the precision of measurements by harnessing entanglement is a long-sought
goal in quantum metrology,. Yet attaining the best sensitivity allowed by quantum theory in …

The circuit model of a quantum computer consists of sequences of gate operations between
quantum bits (qubits), drawn from a universal family of discrete operations. The ability to …

The Greenberger-Horne-Zeilinger (GHZ) state is a key resource for quantum information
processing and quantum metrology. The atomic GHZ state can be generated by one-axis …

Quantum field theories are the cornerstones of modern physics, providing relativistic and
quantum mechanical descriptions of physical systems at the most fundamental level …

Quantum processors use the native interactions between effective spins to simulate
Hamiltonians or execute quantum gates. In most processors, the native interactions are …

A network of bosons evolving among different modes while passing through beam splitters
and phase shifters has been applied to demonstrate quantum computational advantage …

Efficiently entangling pairs of qubits is essential to fully harness the power of quantum
computing. Here, we devise an exact protocol that simultaneously entangles arbitrary pairs …

In a large scale trapped atomic ion quantum computer, high-fidelity two-qubit gates need to
be extended over all qubits with individual control. We realize and characterize high-fidelity …