109 citations · 433 across the 18 of their papers we have counts for
18 papers
Coulomb blockade in microscopic material defects as a source of decoherence and noise in solid-state quantum circuits
R. Banerjee, L. P. Lindoy, M. Hegedus +9
A critical limitation of solid-state quantum devices arises from the materials from which they are fabricated: uncontrolled surfaces, interfaces, and structural imperfections intro…
Phonon-bottlenecked spin relaxation of Er:CaWO at milliKelvin temperatures
S. Rajendran, B. Mistri, P. K. Sharma +5
We study spin-lattice relaxation times of electron spins in Er:CaWO at millikelvin temperature, detected via their coupling to a low-mode volume superconducting resonato…
In-operando microwave scattering-parameter calibrated measurement of a Josephson travelling wave parametric amplifier
S. H. Shin, M. Stanley, W. N. Wong +5
Superconducting travelling wave parametric amplifiers (TWPAs) are broadband near-quantum limited microwave amplifiers commonly used for qubit readout and a wide range of other appl…
Scaling of self-stimulated spin echoes
Sebastian de Graaf, Aditya Jayaraman, Sergey Kubatkin +2
Self-stimulated echoes have recently been reported in the high cooperativity and inhomogeneous coupling regime of spin ensembles with superconducting resonators. In this work, we s…
Electromagnetic response of the surface states of a topological insulator nanowire embedded within a resonator
Shimon Arie Haver, Eran Ginossar, Sebastian E. de Graaf +1
Exploring the interplay between topological phases and photons opens new avenues for investigating novel quantum states. Here we show that superconducting resonators can serve as s…
Quantum bath suppression in a superconducting circuit by immersion cooling
M. Lucas, A. V. Danilov, L. V. Levitin +7
Quantum circuits interact with the environment via several temperature-dependent degrees of freedom. Yet, multiple experiments to-date have shown that most properties of supercondu…
Electronic confinement of surface states in a topological insulator nanowire
Ruchi Saxena, Eytan Grosfeld, Sebastian E de Graaf +4
We analyze the confinement of electronic surface states in a model of a topological insulator nanowire. Spin-momentum locking in the surface states reduces unwanted backscattering…
Spin echo silencing using a current-biased frequency-tunable resonator
V. Ranjan, Y. Wen, A. K. V. Keyser +5
The ability to control microwave emission from a spin ensemble is a requirement of several quantum memory protocols. Here, we demonstrate such ability by using a resonator whose fr…
Quantitative infrared near-field imaging of suspended topological insulator nanostructures
C. Lupo, J. Andzane, D. Montemurro +5
The development of nanoscale solid-state devices exploiting the promising topological surface states of topological insulator materials requires careful device engineering and impr…
Suppression of 1/f noise in solid state quantum devices by surface spin desorption
S. E. de Graaf, L. Faoro, J. Burnett +5
Noise and decoherence due to spurious two-level systems (TLS) located at material interfaces is a long-standing issue in solid state quantum technologies. Efforts to mitigate the e…
Multiplexing Superconducting Qubit Circuit for Single Microwave Photon Generation
R E George, J Senior, O-P Saira +4
We report on a device that integrates eight superconducting transmon qubits in lambda/4 superconducting coplanar waveguide resonators fed from a common feedline. Using this multipl…
Direct identification of dilute surface spins on AlO: Origin of flux noise in quantum circuits
S. E. de Graaf, A. A. Adamyan, T. Lindström +4
It is universally accepted that noise and decoherence affecting the performance of superconducting quantum circuits are consistent with the presence of spurious two-level systems (…
Angular dependent micro-ESR characterization of a locally doped Gd3+:Al2O3 system
I. S. Wisby, S. E. de Graaf, R. Gwilliam +5
Interfacing rare-earth doped crystals with superconducting circuit architectures provides an attractive platform for quantum memory and transducer devices. Here we present the deta…
Tuneable on-demand single-photon source
Z. H. Peng, J. S. Tsai, O. V. Astafiev
An on-demand single photon source is a key element in a series of prospective quantum technologies and applications. We demonstrate the operation of a tuneable on-demand microwave…
Coupling of a locally implanted rare-earth ion ensemble to a superconducting micro-resonator
I. Wisby, S. E. de Graaf, R. Gwilliam +5
We demonstrate the coupling of rare-earth ions locally implanted in a substrate (Gd in AlO) to a superconducting NbN lumped-element micro-resonator. The hybrid d…
A near-field scanning microwave microscope based on a superconducting resonator for low power measurements
S. E. de Graaf, A. V. Danilov, A. Adamyan +1
We report on the design and performance of a cryogenic (300 mK) near-field scanning microwave microscope. It uses a microwave resonator as the near-field sensor, operating at a fre…
Dynamic parity recovery in a strongly driven Cooper-pair box
S. E. de Graaf, J. Leppäkangas, A. Adamyan +6
We study a superconducting charge qubit coupled to an intensive electromagnetic field and probe changes in the resonance frequency of the formed dressed states. At large driving st…
Effects of quasiparticle tunneling in a circuit-QED realization of a strongly driven two-level system
J. Leppäkangas, S. E. de Graaf, A. Adamyan +5
We experimentally and theoretically study the frequency shift of a driven cavity coupled to a superconducting charge qubit. In addition to previous studies, we here also consider d…