659 citations · 2.1k across the 17 of their papers we have counts for
17 papers
Effects of surface treatments on flux tunable transmon qubits
M. Mergenthaler, C. Müller, M. Ganzhorn +9
One of the main limitations in state-of-the art solid-state quantum processors are qubit decoherence and relaxation due to noise in their local environment. For the field to advanc…
Benchmarking the noise sensitivity of different parametric two-qubit gates in a single superconducting quantum computing platform
M. Ganzhorn, G. Salis, D. J. Egger +8
The possibility to utilize different types of two-qubit gates on a single quantum computing platform adds flexibility in the decomposition of quantum algorithms. A larger hardware-…
Time-resolved tomography of a driven adiabatic quantum simulation
Gian Salis, Nikolaj Moll, Marco Roth +2
A typical goal of a quantum simulation is to find the energy levels and eigenstates of a given Hamiltonian. This can be realized by adiabatically varying the system control paramet…
Gate-efficient simulation of molecular eigenstates on a quantum computer
Marc Ganzhorn, Daniel J. Egger, Panagiotis Kl. Barkoutsos +8
A key requirement to perform simulations of large quantum systems on near-term quantum hardware is the design of quantum algorithms with short circuit depth that finish within the…
Local control theory for superconducting qubits
M. Malis, P. Kl. Barkoutsos, M. Ganzhorn +4
In this work, we develop a method to design control pulses for fixed-frequency superconducting qubits coupled via tunable couplers based on local control theory, an approach common…
Adiabatic quantum simulations with driven superconducting qubits
Marco Roth, Nikolaj Moll, Gian Salis +4
We propose a quantum simulator based on driven superconducting qubits where the interactions are generated parametrically by a polychromatic magnetic flux modulation of a tunable b…
Quantum algorithms for electronic structure calculations: particle/hole Hamiltonian and optimized wavefunction expansions
Panagiotis Kl. Barkoutsos, Jerome F. Gonthier, Igor Sokolov +9
In this work we investigate methods to improve the efficiency and scalability of quantum algorithms for quantum chemistry applications. We propose a transformation of the electroni…
Entanglement generation in superconducting qubits using holonomic operations
Daniel J. Egger, Marc Ganzhorn, Gian Salis +6
We investigate a non-adiabatic holonomic operation that enables us to entangle two fixed-frequency superconducting transmon qubits attached to a common bus resonator. Two coherent…
Advanced Fabrication of Single-crystal Diamond Membranes for Quantum Technologies
Michel Challier, Selda Sonusen, Arne Barfuss +7
Many promising applications of single crystal diamond and its color centers as sensor platform and in photonics require free-standing membranes with a thickness ranging from severa…
Pulsed reset protocol for fixed-frequency superconducting qubits
Daniel J. Egger, Max Werninghaus, Marc Ganzhorn +4
Improving coherence times of quantum bits is a fundamental challenge in the field of quantum computing. With long-lived qubits it becomes, however, inefficient to wait until the qu…
Quantum optimization using variational algorithms on near-term quantum devices
Nikolaj Moll, Panagiotis Barkoutsos, Lev S. Bishop +15
Universal fault-tolerant quantum computers will require error-free execution of long sequences of quantum gate operations, which is expected to involve millions of physical qubits.…
Analysis of parametrically driven exchange-type (iSWAP) and two-photon (bSWAP) interactions between superconducting qubits
Marco Roth, Marc Ganzhorn, Nikolaj Moll +3
A current bottleneck for quantum computation is the realization of high-fidelity two-qubit quantum operations between two and more quantum bits in arrays of coupled qubits. Gates b…
Fabrication of all diamond scanning probes for nanoscale magnetometry
Patrick Appel, Elke Neu, Marc Ganzhorn +5
The electronic spin of the nitrogen vacancy (NV) center in diamond forms an atomically sized, highly sensitive sensor for magnetic fields. To harness the full potential of individu…
Quantitative nanoscale vortex-imaging using a cryogenic quantum magnetometer
Lucas Thiel, Dominik Rohner, Marc Ganzhorn +6
Microscopic studies of superconductors and their vortices play a pivotal role in our understanding of the mechanisms underlying superconductivity. Local measurements of penetration…
Nanoscale microwave imaging with a single electron spin in diamond
Patrick Appel, Marc Ganzhorn, Elke Neu +1
We report on imaging of microwave (MW) magnetic fields using a magnetometer based on the electron spin of a nitrogen vacancy center in diamond. We quantitatively image the magnetic…
Photonic nano-structures on (111) oriented diamond
Elke Neu, Patrick Appel, Marc Ganzhorn +7
We demonstrate the fabrication of single-crystalline diamond nanopillars on a (111)-oriented chemical vapor deposited diamond substrate. This crystal orientation offers optimal cou…
Dynamics and Dissipation induced by Single-Electron Tunneling in Carbon Nanotube Nanoelectromechanical Systems
Marc Ganzhorn, Wolfgang Wernsdorfer
We demonstrate the effect of single-electron tunneling (SET) through a carbon nanotube quantum dot on its nanomechanical motion. We find that the frequency response and the dissipa…