70 citations · 583 across the 19 of their papers we have counts for
19 papers
Quantum Coherence in Superconducting Vortex States
Ameya Nambisan, Simon Günzler, Dennis Rieger +13
Abrikosov vortices, where the superconducting gap is completely suppressed in the core, are dissipative, semi-classical entities that impact applications from high-current-density…
Observation of Perfect Absorption in Hyperfine Levels of Molecular Spins with Hermitian Subspaces
Claudio Bonizzoni, Daniele Lamberto, Samuel Napoli +7
We investigate Perfect Absorption (PA) of radiation, in which incoming energy is entirely dissipated, in a system consisting of molecular spin centers coherently coupled to a plana…
Kinetic inductance coupling for circuit QED with spins
S. Günzler, D. Rieger, M. Spiecker +5
In contrast to the commonly used qubit resonator transverse coupling via the -degree of freedom, longitudinal coupling through presents a tantalizing alternative: it…
Spin Environment of a Superconducting Qubit in High Magnetic Fields
S. Günzler, J. Beck, D. Rieger +9
Superconducting qubits equipped with quantum non-demolition readout and active feedback can be used as information engines to probe and manipulate microscopic degrees of freedom, w…
Pure kinetic inductance coupling for cQED with flux qubits
Simon Geisert, Soeren Ihssen, Patrick Winkel +11
We demonstrate a qubit-readout architecture where the dispersive coupling is entirely mediated by a kinetic inductance. This allows us to engineer the dispersive shift of the reado…
Granular Aluminum Parametric Amplifier for Low-Noise Measurements in Tesla Fields
Nicolas Zapata, Ivan Takmakov, Simon Günzler +8
Josephson junction parametric amplifiers have become essential tools for microwave quantum circuit readout with minimal added noise. Even after improving at an impressive rate in t…
Observation of Josephson Harmonics in Tunnel Junctions
Dennis Willsch, Dennis Rieger, Patrick Winkel +27
Approaches to developing large-scale superconducting quantum processors must cope with the numerous microscopic degrees of freedom that are ubiquitous in solid-state devices. State…
Fano Interference in Microwave Resonator Measurements
D. Rieger, S. Günzler, M. Spiecker +3
Resonator measurements are a simple but powerful tool to characterize a material's microwave response. The losses of a resonant mode are quantified by its internal quality factor $…
Two-level system hyperpolarization using a quantum Szilard engine
Martin Spiecker, Patrick Paluch, Nicolas Gosling +16
The innate complexity of solid state physics exposes superconducting quantum circuits to interactions with uncontrolled degrees of freedom degrading their coherence. By using a sim…
Gralmonium: Granular Aluminum Nano-Junction Fluxonium Qubit
D. Rieger, S. Günzler, M. Spiecker +7
Mesoscopic Josephson junctions (JJs), consisting of overlapping superconducting electrodes separated by a nanometer thin oxide layer, provide a precious source of nonlinearity for…
Operating in a deep underground facility improves the locking of gradiometric fluxonium qubits at the sweet spots
Daria Gusenkova, Francesco Valenti, Martin Spiecker +14
We demonstrate flux-bias locking and operation of a gradiometric fluxonium artificial atom using two symmetric granular aluminum (grAl) loops to implement the superinductor. The gr…
Superconducting microwave magnetometer for absolute flux detection
Simon Günzler, Patrick Winkel, Dennis Rieger +5
Superconducting quantum interference devices (SQUIDs) are among the most sensitive detectors for out-of-plane magnetic field components. However, due to their periodic response wit…
Minimizing the discrimination time for quantum states of an artificial atom
Ivan Takmakov, Patrick Winkel, Farshad Foroughi +9
Fast discrimination between quantum states of superconducting artificial atoms is an important ingredient for quantum information processing. In circuit quantum electrodynamics, in…
Quantum non-demolition dispersive readout of a superconducting artificial atom using large photon numbers
Daria Gusenkova, Martin Spiecker, Richard Gebauer +13
Reading out the state of superconducting artificial atoms typically relies on dispersive coupling to a readout resonator. For a given system noise temperature, increasing the circu…
Superconducting granular aluminum resonators resilient to magnetic fields up to 1 Tesla
K. Borisov, D. Rieger, P. Winkel +8
High kinetic inductance materials constitute a valuable resource for superconducting quantum circuits and hybrid architectures. Superconducting granular aluminum (grAl) reaches kin…
Implementation of a transmon qubit using superconducting granular aluminum
Patrick Winkel, Kiril Borisov, Lukas Grünhaupt +6
The high kinetic inductance offered by granular aluminum (grAl) has recently been employed for linear inductors in superconducting high-impedance qubits and kinetic inductance dete…
Non-degenerate parametric amplifiers based on dispersion engineered Josephson junction arrays
Patrick Winkel, Ivan Takmakov, Dennis Rieger +12
Determining the state of a qubit on a timescale much shorter than its relaxation time is an essential requirement for quantum information processing. With the aid of a new type of…
3D Cavity quantum electrodynamics with a rare-earth spin ensemble
S. Probst, A. Tkalcec, H. Rotzinger +6
We present cavity QED experiments with an Er:YSO crystal magnetically coupled to a 3D cylindrical sapphire loaded copper resonator. Such waveguide cavities are promising for the re…
Strong coupling of an Er3+ doped YAlO3 crystal to a superconducting resonator
A. Tkalcec, S. Probst, D. Rieger +7
Quantum memories are integral parts of both quantum computers and quantum communication networks. Naturally, such a memory is embedded into a hybrid quantum architecture, which has…