A5075885110- Quantum Information and Cryptography
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Computing Algorithms and Architecture
- Advanced Frequency and Time Standards
- Atomic and Molecular Physics
- Quantum Mechanics and Applications
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Mass Spectrometry Techniques and Applications
- Quantum and electron transport phenomena
- Molecular Junctions and Nanostructures
- 3D Surveying and Cultural Heritage
- Gamma-ray bursts and supernovae
- Ion-surface interactions and analysis
- Dark Matter and Cosmic Phenomena
- EEG and Brain-Computer Interfaces
- Gas Sensing Nanomaterials and Sensors
- Quantum Dots Synthesis And Properties
- Spectroscopy and Quantum Chemical Studies
- Orbital Angular Momentum in Optics
- Quantum, superfluid, helium dynamics
- Gold and Silver Nanoparticles Synthesis and Applications
- Force Microscopy Techniques and Applications
- Analytical chemistry methods development
- Laser Material Processing Techniques
Leibniz University Hannover
2016-2024
Physikalisch-Technische Bundesanstalt
2016-2023
Johannes Gutenberg University Mainz
2011
Universität Ulm
2010
Microwave trapped-ion quantum logic gates avoid spontaneous emission as a fundamental source of decoherence. However, microwave two-qubit are still slower than laser-induced and hence more sensitive to fluctuations noise the motional mode frequency. We propose implement amplitude-shaped gate drives obtain resilience such frequency changes without increasing pulse energy per operation. demonstrate by injection during entangling with $^9$Be$^+$ ion qubits. In absence injected noise, amplitude...
Trapped ions in radio-frequency traps are among the leading approaches for realizing quantum computers, because of high-fidelity gates and long coherence times
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-vacuum imaging lens, and helical resonator. We demonstrate ground state cooling all three modes motion single 9Be+ determine their heating rates as well excess axial micromotion. The shows one the lowest levels electric field noise published to date. investigate magnetic-field suppression in shields made from copper,...
We describe the design, commissioning, and operation of an ultra-low-vibration closed-cycle cryogenic ion trap apparatus. One hundred lines for low-frequency signals eight microwave/radio frequency coaxial feed-lines offer possibility implementing a small-scale ion-trap quantum processor or simulator. With all supply cables attached, more than 1.3 W cooling power at 5 K is still available absorbing energy from electrical pulses introduced to control ions. The itself isolated vibrations...
We demonstrate the experimental realization of a two-qubit M{\o}lmer-S{\o}rensen gate on magnetic field-insensitive hyperfine transition in $^9$Be$^+$ ions using microwave-near fields emitted by single microwave conductor embedded surface-electrode ion trap. The design was optimized to produce high oscillating field gradient at position. measured fidelity is determined be $98.2\pm1.2\,\%$ and limited technical imperfections, as confirmed comprehensive numerical error analysis. can...
We discuss the experimental feasibility of quantum simulation with trapped ion crystals, using magnetic field gradients. describe a micro structured planar trap, which contains central wire loop generating strong gradient about 20 T/m in an crystal held 160 μm above surface. On theoretical side, we extend proposal spin-spin interactions via induced coupling (MAGIC) [J. Phys. B At. Mol. Opt. 42, 154009 (2009)]. aspects where traps promise novel physics: strengths transversal eigenmodes...
We present a novel ion trap fabrication method enabling the realization of multilayer traps scalable to an in principle arbitrary number metal-dielectric levels. benchmark our by fabricating with integrated three-dimensional microwave circuitry. demonstrate trapping and control hyperfine states laser cooled $\,^{9}$Be$^{+}$ held at distance 35$\,\mu$m above surface. This can be used implement large-scale arrays for quantum information processing simulation.
We describe a versatile planar Penning trap structure, which allows one to dynamically modify the trapping configuration almost arbitrarily. The consists of 37 hexagonal electrodes, each with circumcircle diameter 300 μm, fabricated in gold-on-sapphire lithographic technique. Every hexagon can be addressed individually, thus shaping electric potential. fabrication such device clean room methods is demonstrated. illustrate variability by detailed numerical simulation lateral and vertical...
Abstract Cosmological observations as well theoretical approaches to physics beyond the standard model provide strong motivations for experimental tests of fundamental symmetries, such CPT invariance. In this context, availability cold baryonic antimatter at CERN has opened an avenue ultrahigh-precision comparisons protons and antiprotons in Penning traps. This work discusses method inspired by quantum logic techniques that will improve particle localization readout speed experiments. The...
Gold nanoparticles supported on TiO2 and Al2O3 were prepared by using the deposition-precipitation with urea (DP Urea) method. The control of particle size was achieved varying both, stirring time during (DP) procedure conditions thermal treatment. We focused mainly treatment temperature, although gas flow type atmosphere also influence importantly particle's shape, as we shall show. optical response metallic is given its surface plasmon resonance position shape depends strongly...
We develop an intuitive model of 2D microwave near-fields in the unusual regime centimeter waves localized to tens microns. Close intensity minimum, a simple effective description emerges with five parameters which characterize strength and spatial orientation zero first order terms near-field, as well field polarization. Such configuration is realized microfabricated planar structure integrated conductor operating near 1 GHz. use single 9Be+ ion high-resolution quantum sensor measure...
Current experimental efforts to test the fundamental CPT symmetry with single (anti-)protons are progressing at a rapid pace but hurt by nonzero temperature of particles and difficulty spin state detection. We describe laser-based quantum logic inspired approach (anti-)proton cooling
Abstract Microwave control of trapped ions can provide an implementation high-fidelity two-qubit gates free from errors induced by photon scattering. Furthermore, microwave conductors may be embedded into a scalable trap structure, providing the chip-level integration that is desirable for scaling. Recent developments have demonstrated how amplitude modulation gate drive permit entangling operation to become robust against motional mode noise and other experimental imperfections. Here, we...
Abstract We demonstrate a microfabricated surface-electrode ion trap that is applicable as nanofriction emulator and studies of many-body dynamics interacting systems. The enables both single-well double-well trapping potentials in the radial direction, where distance between two potential wells can be adjusted by applied RF voltage. In configuration, parallel strings formed, which suitable system for emulation Frenkel–Kontorova (FK) model. derive condition under functions an FK model...
We discuss laser-based and quantum logic inspired cooling detection methods amenable to single (anti-)protons. These would be applicable e.g. in a g-factor based test of CPT invariance as currently pursued within the BASE collaboration. Towards this end, we explore sympathetic (anti-)protons with atomic ions suggested by Heinzen Wineland (1990).
Trapped ions in radio-frequency traps are among the leading approaches for realizing quantum computers, due to high-fidelity gates and long coherence times. However, use of radio-frequencies presents a number challenges scaling, including requiring compatibility chips with high voltages, managing power dissipation restricting transport placement ions. By replacing field 3 T magnetic field, we here realize micro-fabricated Penning ion trap which removes these restrictions. We demonstrate full...
Microwave control of trapped ions can provide an implementation high-fidelity two-qubit gates free from errors induced by photon scattering. Furthermore, microwave conductors may be embedded into a scalable trap structure, providing the chip-level integration that is desirable for scaling. Recent developments have demonstrated how amplitude modulation gate drive permit entangling operation to become robust against motional mode noise and other experimental imperfections. Here, we discuss...
Current precision experiments with single (anti)protons to test CPT symmetry progress at a rapid pace, but are complicated by the need cool particles sub-thermal energies.We describe cryogenic Penning-trap setup for 9 Be + ions designed allow coupling of laser-cooled atomic sympathetic cooling and quantum logic spectroscopy.We report on trapping laser clouds ions.We discuss prospects microfabricated trap lasercooled sub-mK temperatures ms time scales.