56 research outputs found
Ion traps fabricated in a CMOS foundry
We demonstrate trapping in a surface-electrode ion trap fabricated in a 90-nm
CMOS (complementary metal-oxide-semiconductor) foundry process utilizing the
top metal layer of the process for the trap electrodes. The process includes
doped active regions and metal interconnect layers, allowing for co-fabrication
of standard CMOS circuitry as well as devices for optical control and
measurement. With one of the interconnect layers defining a ground plane
between the trap electrode layer and the p-type doped silicon substrate, ion
loading is robust and trapping is stable. We measure a motional heating rate
comparable to those seen in surface-electrode traps of similar size. This is
the first demonstration of scalable quantum computing hardware, in any
modality, utilizing a commercial CMOS process, and it opens the door to
integration and co-fabrication of electronics and photonics for large-scale
quantum processing in trapped-ion arrays.Comment: 4 pages, 3 figure
Ablation loading of barium ions into a surface electrode trap
Trapped-ion quantum information processing may benefit from qubits encoded in
isotopes that are practically available in only small quantities, e.g. due to
low natural abundance or radioactivity. Laser ablation provides a method of
controllably liberating neutral atoms or ions from low-volume targets, but
energetic ablation products can be difficult to confine in the small
ion-electrode distance, micron-scale, microfabricated traps amenable to
high-speed, high-fidelity manipulation of ion arrays. Here we investigate
ablation-based ion loading into surface-electrode traps of different sizes to
test a model describing ion loading probability as a function of effective trap
volume and other trap parameters. We demonstrate loading of ablated and
photoionized barium in two cryogenic surface-electrode traps with 730 m
and 50 m ion-electrode distances. Our loading success probability agrees
with a predictive analytical model, providing insight for the confinement of
limited-quantity species of interest for quantum computing, simulation, and
sensing
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