Publications (15)
Landau-Zener-Stückelberg-Majorana lasing in circuit QED
P. Neilinger, S. N. Shevchenko, J. Bogár +7
We demonstrate amplification (and attenuation) of a probe signal by a driven two-level quantum system in the Landau-Zener-Stückelberg-Majorana regime by means of an experiment, in…
Finite quasiparticle lifetime in disordered superconductors
M. ŽemliÄka, P. Neilinger, M. Trgala +8
We investigate the complex conductivity of a highly disordered MoC superconducting film with , where is the Fermi wavenumber and is the mean free path, der…
Third harmonic-mediated amplification in TWPA
E. Rizvanov, S. Kern, P. Neilinger +1
In Josephson Traveling-Wave Parametric Amplifiers, higher-order harmonics of the pump tone and its sidebands are commonly present and typically regarded as parasitic. Consequently,…
Observation of quantum corrections to conductivity up to optical frequencies
P. Neilinger, J. Greguš, D. Manca +6
It is well known that conductivity of disordered metals is suppressed in the limit of low frequencies and temperatures by quantum corrections. Although predicted by theory to exist…
Kinetic planar resonators from strongly disordered ultra-thin MoC superconducting films investigated by transmission line spectroscopy
M. Baránek, P. Neilinger, D. Manca +1
"The non-contact broadband transmission line flip-chip spectroscopy technique is utilized to probe resonances of mm-sized square kinetic planar resonators made from strongly disord…
Damping in Ru/Co-based multilayer films with large Dzyaloshinskii-Moriya interaction
T. Å Äepka, P. Neilinger, A. S. Samardak +11
Recent development of the magnetic material engineering led to achievement of the systems with a high interfacial Dzyaloshinskii-Moriya interaction (DMI). As a result, the formatio…
Dressed-state amplification by a superconducting qubit
G. Oelsner, P. Macha, O. V. Astafiev +6
We demonstrate amplification of a microwave signal by a strongly driven two-level system in a coplanar waveguide resonator. The effect known from optics as dressed-state lasing is…
On the origin of in-gap states in homogeneously disordered ultrathin films. MoC case
V. HaÅ¡ková, M. KopÄÃk, P. Szabó +7
Many disordered superconducting films exhibit smeared tunneling spectra with evident in-gap states. We demonstrated that the tunneling density of states in ultrathin MoC films is g…
Parametric amplification by coupled flux qubits
M. Rehak, P. Neilinger, M. Grajcar +4
We report the parametric amplification of a microwave signal in a Kerr medium formed from superconducting qubits. Two mutually coupled flux qubits, embedded in the current antinode…
Reflection-enhanced gain in traveling-wave parametric amplifiers
S. Kern, P. Neilinger, E. Iľichev +12
The operating principle of traveling-wave parametric amplifiers is typically understood in terms of the standard coupled mode theory, which describes the evolution of forward propa…
Two-photon lasing by a superconducting qubit
P. Neilinger, M. Rehák, M. Grajcar +3
We study the response of a magnetic-field-driven superconducting qubit strongly coupled to a superconducting coplanar waveguide resonator. We observed a strong amplification/dampin…
Experimental system design for the integration of trapped-ion and superconducting qubit systems
D. De Motte, A. R. Grounds, M. Rehák +8
We present a design for the experimental integration of ion trapping and superconducting qubit systems as a step towards the realization of a quantum hybrid system. The scheme addr…
Design of deeply cooled ultra-low dissipation amplifier and measuring cell for quantum measurements with a microwave single-photon counter
O. G. Turutanov, A. M. Korolev, V. I. Shnyrkov +6
The requirements and details of designing a measuring cell and low-back-action deeply-cooled amplifier for quantum measurements at 10 mK are discussed. This equipment is a part of…
A numerical extrapolation method for complex conductivity of disordered metals
S. Kern, P. Neilinger, D. Manca +3
Recently, quantum corrections to optical conductivity of disordered metals up to the UV region were observed. Although this increase of conductivity with frequency, also called ant…
Zeeman driven superconductor insulator transition in strongly disordered MoC film. STM and transport studies in transverse magnetic field
M. ŽemliÄka, M. KopÄÃk, P. Szabó +5
Superconductor insulator transition in transverse magnetic field is studied in the highly disordered MoC film with the product of the Fermi momentum and the mean free path …