Quantum devices that exploit quantum superposition states for technology hold great promise for applications ranging from navigation, the definition of time and frequency standards, determining fundamental constants of nature, surface characterization and bio/chemical sensing. In particular, atomic sensors which exploit coherent matter waves are one of the frontier areas of quantum science technology already finding commercial applications, largely due to continuing improvements in the ways we create and control quantum coherence and miniaturization of components such as lasers, vapour cells and chip-based quantum devices.

The Exotic Quantum Matter group has a long standing activity in developing integrated devices for manipulating ultracold atoms (**atom chips**) and pioneered novel applications of **small atomic ensembles as sensors** for tiny gravitational gradients and mapping spatially varying magnetic and electric fields close to surfaces. While these applications are based on single particle coherence, the next generation of sensors will exploit collective properties of many-body quantum systems to reach the ultimate sensitivity allowed by quantum mechanics.

**More details about our quantum devices research can be found in the following papers**

### Realization of a Rydberg-dressed atomic clock

We present the experimental realization and characterization of an atomic clock based on optically trapped ultracold potassium atoms, where one state is continuously coupled by an off-resonant laser field to…

### Sub-micron period lattice structures of magnetic microtraps for ultracold atoms on an atom chip, in Phys. Rev. D

We report on the design, fabrication and characterization of magnetic nanostructures to create a lattice of magnetic traps with sub-micron period for trapping ultracold atoms. These magnetic nanostructures were fabricated…

### Radio-frequency spectroscopy of a linear array of Bose-Einstein condensates in a magnetic lattice, Phys. Rev. A

We report site-resolved radio-frequency spectroscopy measurements of Bose-Einstein condensates of 87Rb atoms in about 100 sites of a one-dimensional (1D) 10-μm-period magnetic lattice produced by a grooved magnetic film plus…

### Periodic array of Bose-Einstein condensates in a magnetic lattice, in Phys. Rev. A

We report the realization of a periodic array of Bose-Einstein condensates (BECs) of 87Rb F=1 atoms trapped in a one-dimensional magnetic lattice close to the surface of an atom chip….

### Detection of small atom numbers through image processing, in Phys. Rev. A

We demonstrate improved detection of small trapped atomic ensembles through advanced postprocessing and optimal analysis of absorption images. A fringe-removal algorithm reduces imaging noise to the fundamental photon-shot-noise level and…

### Optimized magnetic lattices for ultracold atomic ensembles, in New J. Phys.

We introduce a general method for designing tailored lattices of magnetic microtraps for ultracold atoms on the basis of patterned permanently magnetized films. A fast numerical algorithm is used to…

### Box traps on an atom chip for one-dimensional quantum gases, in J. Phys. B

We present the implementation of tailored trapping potentials for ultracold gases on an atom chip. We realize highly elongated traps with box-like confinement along the long, axial direction combined with…

### Spatially resolved excitation of Rydberg atoms and surface effects on an atom chip, in Phys. Rev. A

We demonstrate spatially resolved, coherent excitation of Rydberg atoms on an atom chip. Electromagnetically induced transparency (EIT) is used to investigate the properties of the Rydberg atoms near the gold-coated…