Conveners
Quantum Technologies
- Marion Mallweger
Quantum Technologies
- Marion Mallweger
Trapped ions have proved to be a promising way of realising a large-scale quantum computer. They allow for simple reproducibility and modular architectures which is crucial for a scalable, universal quantum computer. Our blueprint for a trapped-ion based quantum computer outlines operating with global microwave (MW) fields to dress the ground-state hyperfine manifold of 171Yb+ ions [1]....
Quantum computing has emerged as a promising frontier with the potential to revolutionize computation by effectively tackling classically intractable problems. Among the various platforms for realizing a universal quantum computer, trapped ions have demonstrated their capabilities, allowing for quantum gate operations on quantum bits (qubits) by manipulating single or multiple ions. This...
We present and discuss industrially fabricated ion trap chips [1, 2] on the dielectric substrates Fused Silica and Sapphire.
Surface ion trap chips offer a promising platform for the scaling of ion trap quantum computers. We investigate shuttling in the radial direction as element of a scalable architecture [1]. For this, we present chips that are designed to trap ions in two-well...
The ion trap serves as a quantum platform with the potential to facilitate the realization of a scalable, fault-tolerant quantum computer, coupled with a straightforward photonic interface for connection to the so-called quantum network. In this system, multiple ions can be trapped within a single trap and individually controlled via laser manipulation. However, practical implementation faces...
We demonstrate the fabrication and operation of a linear Paul trap made from a single piece of fused silica. The glass is machined using a femtosecond laser assisted etching technique and subsequently coated with a conductive layer of gold. T-shaped trenches along the surface of the glass ensure insulation between neighbouring electrodes, without the use of shadow masks during the coating...
Sisyphus cooling below the Doppler limit in polarization gradients has been a backbone of ultracold atom experiments for decades. It has recently been demonstrated for trapped ions as well. The potential advantage is that it can simultaneously cool multiple modes of a Coulomb crystal below the Doppler limit and could thus improve the time required to cool all modes of large ion crystals close...
Using reflecting boundary conditions, we can control the spontaneous emission of trapped $^{138}\mathrm{Ba}^+$ ions. By reflecting the ion's fluorescence light onto itself, the single photons emitted by the ions interfere with the ions themselves, allowing control over the emission rate. The control is dependent on the solid angle at which the produced photons are retro-reflected, and in order...
Characterization of noise of a quantum harmonic oscillator is important for many experimental platforms. We experimentally demonstrate motional spin-locking spectroscopy, a method that allows to directly measure the motional noise spectrum of a quantum harmonic oscillator. In a spin-locking experiment, the free-evolution period of a Ramsey experiment is replaced with a continuous drive of a...
We focus on the theoretical modelling of the dynamics of ion-neutral systems at ultracold temperatures (<< 1K) in order to design ways for their full quantum control. Our aims are connected to experimental investigations of alkaline earth ion - alkali atom systems with hybrid traps. Due to the laser cooling scheme a metastable d-level of the alkaline-earth ion is considerably populated in...
In my talk I present some joint research projects between AQT (a company which developed as a Startup from the University of Innsbruck), research facilities and data centers. Furthermore, I explain how we aim at advancing quantum technologies by the reproducible production of certain quantum devices.
