59 citations · 403 across the 32 of their papers we have counts for
32 papers
Diode Effect in Nonlinear High-Kinetic-Inductance Transmission Line Resonators
Niklas Gaiser, Ciprian Padurariu, Björn Kubala +2
High-kinetic-inductance (HKI) transmission lines provide a promising platform for compact nonlinear superconducting microwave devices. Existing theoretical descriptions are typical…
Stroboscopic detection of itinerant microwave photons
Hanna Zeller, Lukas Danner, Max Hofheinz +3
We present a novel scheme to detect itinerant microwave radiation at the single photon level. Using existing Josephson-photonics devices, where two microwave cavities are coupled b…
Dressed-State Optomechanics in the Few-Photon Regime
Surangana Sengupta, Björn Kubala, Joachim Ankerhold +1
Efficient optomechanical cooling typically requires high photon occupancy to maximize cooling power, a constraint that generally limits the degree of coherent quantum control avail…
Signatures of Dynes superconductivity in the THz response of ALD-grown NbN thin films
Frederik Bolle, Yayi Lin, Ozan Saritas +6
The frequency-dependent complex optical conductivity reflects key properties of superconductors, such as the energy gap in the density of states (DOS) and the superfluid density. F…
Optomechanical Cooling without Residual Heating
Surangana Sengupta, Björn Kubala, Joachim Ankerhold +1
Resolved-sideband cooling is a standard technique in cavity optomechanics enabling quantum control of mechanical motion, but its performance is ultimately limited by quantum backac…
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…
Amplification and Detection of Single Itinerant Microwave Photons
Lukas Danner, Max Hofheinz, Nicolas Bourlet +3
Single-photon detectors are an essential part of the toolbox of modern quantum optics for implementing quantum technologies and enabling tests of fundamental physics. The low energ…
Fast initialization of Bell states with Schrödinger cats in multi-mode systems
Miriam Resch, Ciprian Padurariu, Björn Kubala +1
Schrödinger cat states play an important role for applications in continuous variable quantum information technologies. As macroscopic superpositions they are inherently protected…
Quantum microwaves: stabilizing squeezed light by phase locking
Lukas Danner, Florian Höhe, Ciprian Padurariu +2
Bright sources of quantum microwave light are an important building block for various quantum technological applications. Josephson junctions coupled to microwave cavities are a pa…
Quartet currents in a biased three-terminal diffusive Josephson junction
T. Jonckheere, J. Rech, C. Padurariu +3
Biasing a three-terminal Josephson junction (TTJ) with symmetrical voltages leads to new kinds of DC currents, namely quartet Josephson currents and phase-dependent multip…
Quantum Synchronization in Presence of Shot Noise
Florian Höhe, Lukas Danner, Ciprian Padurariu +3
Synchronization is a widespread phenomenon encountered in many natural and engineered systems with nonlinear classical dynamics. How synchronization concepts and mechanisms transfe…
Tracking a Spin-Polarized Superconducting Bound State across a Quantum Phase Transition
Sujoy Karan, Haonan Huang, Alexander Ivanovic +5
The magnetic exchange coupling between magnetic impurities and a superconductor induce so-called Yu-Shiba-Rusinov (YSR) states which undergo a quantum phase transition (QPT) upon i…
Microwave Excitation of Atomic Scale Superconducting Bound States
Janis Siebrecht, Haonan Huang, Piotr Kot +6
Magnetic impurities on superconductors lead to bound states within the superconducting gap, so called Yu-Shiba-Rusinov (YSR) states. They are parity protected, which enhances their…
Universal scaling of tunable Yu-Shiba-Rusinov states across the quantum phase transition
Haonan Huang, Sujoy Karan, Ciprian Padurariu +5
Quantum magnetic impurities give rise to a wealth of phenomena attracting tremendous research interest in recent years. On a normal metal, magnetic impurities generate the correlat…
Emission of photon multiplets by a dc-biased superconducting circuit
G. C. Ménard, A. Peugeot, C. Padurariu +12
We observe the emission of bunches of photons by a circuit made of a microwave resonator in series with a voltage-biased tunable Josephson junction. The bunches are…
Compact Itinerant Microwave Photonics with Superconducting High-Kinetic Inductance Microstrips
Samuel Goldstein, Guy Pardo, Naftali Kirsh +5
Microwave photonics is a remarkably powerful system for quantum simulation and technologies, but its integration in superconducting circuits, superior in many aspects, is constrain…
Injection locking and synchronization in Josephson photonics devices
Lukas Danner, Ciprian Padurariu, Joachim Ankerhold +1
Injection locking can stabilize a source of radiation, leading to an efficient suppression of noise-induced spectral broadening and therefore, to a narrow spectrum. The technique i…
Superconducting Quantum Interference at the Atomic Scale
S. Karan, H. Huang, C. Padurariu +9
A single spin in a Josephson junction can reverse the flow of the supercurrent. At mesoscopic length scales, such -junctions are employed in various instances from finding the p…
Spin-dependent tunneling between individual superconducting bound states
Haonan Huang, Jacob Senkpiel, Ciprian Padurariu +9
Magnetic impurities on superconductors induce discrete bound levels inside the superconducting gap, known as Yu-Shiba-Rusinov (YSR) states. YSR levels are fully spin-polarized such…
Noise and full counting statistics of a Cooper pair splitter
Nicklas Walldorf, Fredrik Brange, Ciprian Padurariu +1
We investigate theoretically the noise and the full counting statistics of electrons that are emitted from a superconductor into two spatially separated quantum dots by the splitti…
Tunneling dynamics between superconducting bound states at the atomic limit
Haonan Huang, Ciprian Padurariu, Jacob Senkpiel +7
Despite plenty of room at the bottom, there is a limit to the miniaturization of every process. For charge transport this is realized by the coupling of single discrete energy leve…
Magnetic Impurities on Superconducting Surfaces: Phase Transitions and the Role of Impurity-Substrate Hybridization
Haonan Huang, Robert Drost, Jacob Senkpiel +7
Spin-dependent scattering from magnetic impurities inside a superconductor gives rise to Yu-Shiba-Rusinov (YSR) states within the superconducting gap. As such, YSR states have been…
Hanbury Brown and Twiss Exchange Correlations in Graphene Box
Teemu Elo, Zhenbing Tan, Ciprian Padurariu +4
Quadratic detection in linear mesoscopic transport systems produces cross terms that can be viewed as interference signals reflecting statistical properties of charge carriers. In…
Single Channel Josephson Effect in a High Transmission Atomic Contact
Jacob Senkpiel, Simon Dambach, Markus Etzkorn +9
The Josephson effect in scanning tunneling microscopy (STM) is an excellent tool to probe the properties of the superconducting order parameter on a local scale through the Ambegao…