Trapped ions are among the most promising systems for practical quantum computing (QC).
The basic requirements for universal QC have all been demonstrated with ions, and …

Trapped-ion quantum information processors store information in atomic ions maintained in
position in free space by electric fields. Quantum logic is enacted through manipulation of …

We entangle two cotrapped atomic barium ion qubits by collecting single visible photons
from each ion through in vacuo 0.8 NA objectives, interfering them through an integrated …

With the advent of optical clocks featuring fractional frequency uncertainties on the order of
10− 17 and below, new applications such as chronometric leveling with few-centimeter …

Electrons have an intrinsic, indivisible, magnetic dipole aligned with their internal angular
momentum (spin). The magnetic interaction between two electronic spins can therefore …

We report on the implementation of a high fidelity universal gate-set on optical qubits based
on trapped 88 Sr+ ions for the purpose of quantum information processing. All coherent …

Reconstructing the state of quantum many-body systems is of fundamental importance in
quantum information tasks, but extremely challenging due to the curse of dimensionality. In …

Memory is an indispensable component in classical computing systems. While the
development of quantum computing is still in its early stages, current quantum processing …

Qubits have been used as linear spectrum analyzers of their environments. Here we solve
the problem of nonlinear spectral analysis, required for discrete noise induced by a strongly …

Ba 133+ has been identified as an attractive ion for quantum information processing due to
the unique combination of its spin-1/2 nucleus and visible wavelength electronic transitions …