389 citations · 2.3k across the 27 of their papers we have counts for
27 papers
A monolithic segmented 3D ion trap fabricated from fused silica by selective laser-induced etching
Edgar Brucke, Martin Wagener, Moritz Fontboté-Schmidt +10
We present the design, fabrication, and characterization of a monolithic, segmented, three-dimensional linear Paul ion trap for quantum science applications. The trap is fabricated…
Time-adaptive phase estimation
Brennan de Neeve, Andrey V. Lebedev, Vlad Negnevitsky +1
Phase estimation is known to be a robust method for single-qubit gate calibration in quantum computers, while Bayesian estimation is widely used in devising optimal methods for lea…
Low-excitation transport and separation of high-mass-ratio mixed-species ion chains
Francesco Lancellotti, Stephan Welte, Matteo Simoni +6
We demonstrate low-excitation transport and separation of two-ion crystals consisting of one beryllium and one calcium ion, with a high mass ratio of . The full separation inv…
Coherent Control of Trapped Ion Qubits with Localized Electric Fields
R. Srinivas, C. M. Löschnauer, M. Malinowski +8
We present a new method for coherent control of trapped ion qubits in separate interaction regions of a multi-zone trap by simultaneously applying an electric field and a spin-depe…
MaRCoS, an open-source electronic control system for low-field MRI
Vlad Negnevitsky, Yolanda Vives-Gilabert, José M. Algarín +7
Every magnetic resonance imaging (MRI) device requires an electronic control system that handles pulse sequences and signal detection and processing. Here we provide details on the…
Benchmarking the performance of a low-cost Magnetic Resonance Control System at multiple sites in the open MaRCoS community
T. Guallart-Naval, T. O'Reilly, J. M. Algarín +9
Purpose: To describe the current properties and capabilities of an open-source hardware and software package that is being developed by many sites internationally with the aim of p…
Portable magnetic resonance imaging of patients indoors, outdoors and at home
T. Guallart-Naval, J. M. Algarín, R. Pellicer-Guridi +15
Mobile medical imaging devices are invaluable for clinical diagnostic purposes both in and outside healthcare institutions. Among the various imaging modalities, only a few are rea…
Generation of a maximally entangled state using collective optical pumping
M. Malinowski, C. Zhang, V. Negnevitsky +7
We propose and implement a novel scheme for dissipatively pumping two qubits into a singlet Bell state. The method relies on a process of collective optical pumping to an excited l…
A compact ion-trap quantum computing demonstrator
Ivan Pogorelov, Thomas Feldker, Christian D. Marciniak +13
Quantum information processing is steadily progressing from a purely academic discipline towards applications throughout science and industry. Transitioning from lab-based, proof-o…
Entangling logical qubits with lattice surgery
Alexander Erhard, Hendrik Poulsen Nautrup, Michael Meth +8
Future quantum computers will require quantum error correction for faithful operation. The correction capabilities come with an overhead for performing fault-tolerant logical opera…
Encoding a qubit in a trapped-ion mechanical oscillator
Christa Flühmann, Thanh Long Nguyen, Matteo Marinelli +3
The stable operation of quantum computers will rely on error-correction, in which single quantum bits of information are stored redundantly in the Hilbert space of a larger system.…
Repeated multi-qubit readout and feedback with a mixed-species trapped-ion register
Vlad Negnevitsky, Matteo Marinelli, Karan Mehta +3
Quantum error correction will be essential for realizing the full potential of large-scale quantum information processing devices. Fundamental to its experimental realization is th…
Programmable and scalable radio-frequency pulse sequence generator for multi-qubit quantum information experiments
Ben Keitch, Vlad Negnevitsky, Weida Zhang
We present a versatile rf pulse control system that has been designed for multi-qubit quantum experiments. One instrument can be scaled to provide 32 channels of rf between 10 - 45…
Sequential modular position and momentum measurements of a trapped ion mechanical oscillator
C. Flühmann, V. Negnevitsky, M. Marinelli +1
The non-commutativity of position and momentum observables is a hallmark feature of quantum physics. However this incompatibility does not extend to observables which are periodic…
Sustained state-independent quantum contextual correlations from a single ion
F. M. Leupold, M. Malinowski, C. Zhang +4
We use a single trapped-ion qutrit to demonstrate the violation of an input-state-independent non-contextuality inequality using a sequence of randomly chosen quantum non-demolitio…
Assessing the progress of trapped-ion processors towards fault-tolerant quantum computation
A. Bermudez, X. Xu, R. Nigmatullin +12
A quantitative assessment of the progress of small prototype quantum processors towards fault-tolerant quantum computation is a problem of current interest in experimental and theo…
Quantum harmonic oscillator state control in a squeezed Fock basis
D. Kienzler, H. -Y. Lo, V. Negnevitsky +3
We demonstrate control of a trapped-ion quantum harmonic oscillator in a squeezed Fock state basis, using engineered Hamiltonians analogous to the Jaynes-Cummings and anti-Jaynes-C…
Cooling atomic ions with visible and infra-red light
F. Lindenfelser, M. Marinelli, V. Negnevitsky +2
We demonstrate the ability to load, cool and detect singly-charged calcium ions in a surface electrode trap using only visible and infrared lasers for the trapped-ion control. As o…
Observation of quantum interference between separated mechanical oscillator wavepackets
D. Kienzler, C. Flühmann, V. Negnevitsky +4
The ability of matter to be superposed at two different locations while being intrinsically connected by a quantum phase is among the most counterintuitive predictions of quantum p…
Time-dependent Hamiltonian estimation for Doppler velocimetry of trapped ions
L. E. de Clercq, R. Oswald, C. Flühmann +7
The time evolution of a closed quantum system is connected to its Hamiltonian through Schroedinger's equation. The ability to estimate the Hamiltonian is critical to our understand…
Fast quantum control and light-matter interactions at the 10,000 quanta level
J. Alonso, F. M. Leupold, Z. U. Soler +5
Fast control of quantum systems is essential in order to make use of quantum properties before they are degraded by decoherence. This is important for quantum-enhanced information…
Parallel transport quantum logic gates with trapped ions
Ludwig E. de Clercq, Hsiang-Yu Lo, Matteo Marinelli +6
We demonstrate single-qubit operations by transporting a beryllium ion with a controlled velocity through a stationary laser beam. We use these to perform coherent sequences of qua…
Spin-motion entanglement and state diagnosis with squeezed oscillator wavepackets
Hsiang-Yu Lo, Daniel Kienzler, Ludwig de Clercq +4
Mesoscopic superpositions of distinguishable coherent states provide an analog to the Schrödinger's cat thought experiment. For mechanical oscillators these have primarily been rea…
Quantum harmonic oscillator state synthesis by reservoir engineering
D. Kienzler, H. -Y. Lo, B. Keitch +6
The robust generation of quantum states in the presence of decoherence is a primary challenge for explorations of quantum mechanics at larger scales. Using the mechanical motion of…