The quantum noise of the vacuum limits the achievable sensitivity of quantum sensors. In
non-classical measurement schemes the noise can be reduced to overcome this limitation …

Precision laser spectroscopy of cold and trapped molecular ions is a powerful tool in
fundamental physics—used, for example, in determining fundamental constants, testing for …

Linear arrays of trapped and laser-cooled atomic ions are a versatile platform for studying
strongly interacting many-body quantum systems. Effective spins are encoded in long-lived …

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 …

We demonstrate an efficient high-precision optical spectroscopy technique for single
trapped ions with nonclosed transitions. In a double-shelving technique, the absorption of a …

Precision spectroscopy of atomic and molecular ions offers a window to new physics, but is
typically limited to species with a cycling transition for laser cooling and detection. Quantum …

A cryogenic radio-frequency ion trap system designed for quantum logic spectroscopy of
highly charged ions (HCI) is presented. It includes a segmented linear Paul trap, an in …

Qubits encoded in hyperfine states of trapped ions are ideal for quantum computation given
their long lifetimes and low sensitivity to magnetic fields, yet they suffer from off-resonant …

We introduce and demonstrate double-bright electromagnetically-induced-transparency (D-
EIT) cooling as an extension to EIT cooling. By involving an additional ground state, two …

Efficient preparation and detection of the motional state of trapped ions is important in many
experiments ranging from quantum computation to precision spectroscopy. We investigate …