Here we review the field of atom chips in the context of Bose–Einstein Condensates (BEC) as well as cold matter in general. Twenty years after the first realization of the BEC and 15 years after the realization of the atom chip, the latter has been found to enable extraordinary feats: from producing BECs at a rate of several per second, through the realization of matter-wave interferometry, and all the way to novel probing of surfaces and new forces. In addition, technological applications are also being intensively pursued. This review will describe these developments and more, including new ideas which have not yet been realized.

https://tandfonline.com/doi/pdf/10.1080/09500340.2016.1178820

Fifteen years of cold matter on the atom chip: promise, realizations, and prospects.

The coherence of quantum systems is crucial to quantum information processing Although superconducting qubits can process quantum information at microelectronics rates, it remains a challenge to preserve the coherence and therefore the quantum character of the information in these systems An alternative is to share the tasks between different quantum platforms, for example, cold atoms storing the quantum information processed by superconducting circuits Here we characterize the coherence of superposition states of 87Rb atoms magnetically trapped on a superconducting atom chip We load atoms into a persistent-current trap engineered next to a coplanar microwave resonator structure, and observe that the coherence of hyperfine ground states is preserved for several seconds We show that large ensembles of a million of thermal atoms below 350 nK temperature and pure Bose–Einstein condensates with 35 × 105 atoms can be prepared and manipulated at the superconducting interface This opens the path towards the rich dynamics of strong collective coupling regimes Superconducting qubits are promising for quantum information processing, yet maintaining their coherence for long periods is hard Bernon et alcharacterize the coherence of cold atom superposition states trapped on superconducting atom chips and show that such long-lived ensembles are a viable alternative

Manipulation and coherence of ultra-cold atoms on a superconducting atom chip

Here we review the field of atom chips in the context of Bose-Einstein Condensates (BEC) as well as cold matter in general. Twenty years after the first realization of the BEC and fifteen years after the realization of the atom chip, the latter has been found to enable extraordinary feats: from producing BECs at a rate of several per second, through the realization of matter-wave interferometry, and all the way to novel probing of surfaces and new forces. In addition, technological applications are also being intensively pursued. This review will describe these developments and more, including new ideas which have not yet been realized.

Fifteen Years of Cold Matter on the Atom Chip: Promise, Realizations, and Prospects

Superconducting microfabricated ion traps

This roadmap bundles fast developing topics in experimental optical quantum sciences, addressing current challenges as well as potential advances in future research. We have focused on three main areas: quantum assisted high precision measurements, quantum information/simulation, and quantum gases. Quantum assisted high precision measurements are discussed in the first three sections, which review optical clocks, atom interferometry, and optical magnetometry. These fields are already successfully utilized in various applied areas. We will discuss approaches to extend this impact even further. In the quantum information/simulation section, we start with the traditionally successful employed systems based on neutral atoms and ions. In addition the marvelous demonstrations of systems suitable for quantum information is not progressing, unsolved challenges remain and will be discussed. We will also review, as an alternative approach, the utilization of hybrid quantum systems based on superconducting quantum devices and ultracold atoms. Novel developments in atomtronics promise unique access in exploring solid-state systems with ultracold gases and are investigated in depth. The sections discussing the continuously fast-developing quantum gases include a review on dipolar heteronuclear diatomic gases, Rydberg gases, and ultracold plasma. Overall, we have accomplished a roadmap of selected areas undergoing rapid progress in quantum optics, highlighting current advances and future challenges. These exciting developments and vast advances will shape the field of quantum optics in the future. 12 Guest editor of the roadmap. 1 Published in \"Journal of Optics 18(9): 093001, 2016\" which should be cited to refer to this work.

/pdf/roadmap-on-quantum-optical-systems-iaio4b2jug.pdf

Roadmap on quantum optical systems

We store and control ultra-cold atoms in a new type of trap using the magnetic fields of vortices in a high-temperature superconducting micro-structure. We generate the attractive trapping potential for the atoms by combining the magnetic field of a superconductor in the remanent state with external homogeneous magnetic fields. We show the control of crucial atom trap characteristics such as an efficient intrinsic loading mechanism, spatial positioning of the trapped atoms and the vortex density in the superconductor. The measured trap characteristics are in good agreement with our numerical simulations.

/pdf/trapping-of-ultra-cold-atoms-with-the-magnetic-field-of-4wud3nwp06.pdf

Trapping of ultra-cold atoms with the magnetic field of vortices in a thin-film superconducting micro-structure

We store and control ultra-cold atoms in a new type of trap using magnetic fields of vortices in a high temperature superconducting micro-structure. This is the first time ultra-cold atoms have been trapped in the field of magnetic flux quanta. We generate the attractive trapping potential for the atoms by combining the magnetic field of a superconductor in the remanent state with external homogeneous magnetic fields. We show the control of crucial atom trap characteristics such as an efficient intrinsic loading mechanism, spatial positioning of the trapped atoms and the vortex density in the superconductor. The measured trap characteristics are in good agreement with our numerical simulations.

C.B. Zhang

Papers

Trapping of ultra-cold atoms with the magnetic field of vortices in a thin-film superconducting micro-structure

Trapping of ultra-cold atoms with the magnetic field of vortices in a thin film superconducting micro-structure