191 citations · 1.9k across the 47 of their papers we have counts for
24 papers · 1 filter
Quantized current steps due to the a.c. coherent quantum phase-slip effect
R. S. Shaikhaidarov, K. H. Kim, J. W. Dunstan +7
The AC Josephson effect predicted in 1962 and observed experimentally in 1963 as quantised voltage steps (the Shapiro steps) from photon assisted tunnelling of Cooper pairs is amon…
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…
Broadband Sample Holder for Microwave Spectroscopy of Superconducting Qubits
A. S. Averkin, A. Karpov, K. Shulga +5
We present a practical design and implementation of a broadband sample holder suitable for microwave experiments with superconducting integrated circuits at millikelvin temperature…
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…
Phase diagram of the resistive state of the narrow superconducting channel in the voltage-driven regime
Y. S. Yerin, V. N. Fenchenko, E. Il'ichev
Based on the numerical solution non-stationary Ginzburg-Landau equations, we investigated the evolution of the order parameter of superconducting channels with different lengths un…
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…
Resonant excitations of single and two-qubit systems coupled to a tank circuit
S. N. Shevchenko, S. H. W. van der Ploeg, M. Grajcar +3
The interaction of flux qubits with a low frequency tank circuit is studied. It is shown that changes in the state of the interacting qubits influence the effective impedance of th…
Generation of squeezed states of microwave radiation in a superconducting resonant circuit
A. M. Zagoskin, E. Il'ichev, M. W. McCutcheon +2
High-quality superconducting oscillators have been successfully used for quantum control and readout devices in conjunction with superconducting qubits. Also, it is well known that…
Quantum theory of the low-frequency linear susceptibility of interferometer-type superconducting qubits
Ya. S. Greenberg, E. Il'ichev
We use the density matrix formalism to analyze the interaction of interferometer-type superconducting qubits with a high quality tank circuit, which frequency is well below the gap…
Sisyphus cooling and amplification by a superconducting qubit
M. Grajcar, S. H. W. van der Ploeg, A. Izmalkov +5
Laser cooling of the atomic motion paved the way for remarkable achievements in the fields of quantum optics and atomic physics, including Bose-Einstein condensation and the trappi…
Pseudo-Rabi oscillations in superconducting flux qubits in the classical regime
A. N. Omelyanchouk, S. N. Shevchenko, A. M. Zagoskin +2
Nonlinear effects in mesoscopic devices can have both quantum and classical origins. We show that a three-Josephson-junction (3JJ) flux qubit in the _classical_ regime can produce…
Flux qubit as a sensor for a magnetometer with quantum limited sensitivity
E. Il'ichev, Ya. S. Greenberg
We propose to use the quantum properties of a superconducting flux qubit in the construction of a magnetometer with quantum limited sensitivity. The main advantage of a flux qubit…
Realization of a classical counterpart of a scalable design for adiabatic quantum computation
V. Zakosarenko, N. Bondarenko, S. H. W. van der Ploeg +6
We implement a classical counterpart of a scalable design for adiabatic quantum computation. The key element of this design is a coupler providing controllable coupling between two…
Controllable coupling of superconducting flux qubits
S. H. W. van der Ploeg, A. Izmalkov, Alec Maassen van den Brink +5
We have realized controllable coupling between two three-junction flux qubits by inserting an additional coupler loop between them, containing three Josephson junctions. Two of the…
Multiphoton transitions between energy levels in a phase-biased Cooper-pair box
V. I. Shnyrkov, Th. Wagner, D. Born +5
We investigated both theoretically and experimentally dynamic features of a phase-biased charge qubit consisting of a single-Cooper-pair transistor closed by a superconducting loop…
Direct Josephson coupling between superconducting flux qubits
M. Grajcar, A. Izmalkov, S. H. W. van der Ploeg +8
We have demonstrated strong antiferromagnetic coupling between two three-junction flux qubits based on a shared Josephson junction, and therefore not limited by the small inductanc…
Temperature dependence of the resistance of a phase-slip line in a thin superconducting film
E. V. Il'ichev, V. I. Kuznetsov, V. A. Tulin
An experimental investigation was made of the temperature dependence of the first step of a phase-slip line in a thin superconducting tin film. The depth of penetration of a nonequ…
Supercurrent-phase relationship of a Nb/InAs(2DES)/Nb Josephson junction in overlapping geometry
M. Ebel, C. Busch, U. Merkt +3
Superconductor/normal conductor/superconductor (SNS) Josephson junctions with highly transparent interfaces are predicted to show significant deviations from sinusoidal supercurren…
Possible implementation of adiabatic quantum algorithm with superconducting flux qubits
M. Grajcar, A. Izmalkov, E. Il'ichev
We show that an LC parametric transducer can be effectively used to monitor an adiabatic evolution of the superconducting flux qubit. We propose a new scheme to measure the qubit's…
Conversion of phase-slip lines into elementary resistive domains in a current-carrying superconducting thin film
E. V. Il'ichev, V. I. Kuznetsov, V. A. Tulin
A nonmonotonic dependence of the differential resistance of the first step of a phase-slip line on the heat-reservoir temperature near Tc has been observed experimentally for the f…
Observation of a nonmonotonic transverse voltage induced by vortex motion in a superconducting thin film
I. Yu. Antonova, V. M. Zakosarenko, E. V. Il'ichev +2
A vortex-induced transverse voltage in a superconducting film, previously predicted theoretically, has been seen experimentally for the first time. The magnitude of this voltage an…
Method for direct observation of coherent quantum oscillations in a superconducting phase qubit. Computer simulations
Ya. S. Greenberg
Time-domain observations of coherent oscillations between quantum states in mesoscopic superconducting systems have so far been restricted to restoring the time-dependent probabili…
What does the Josephson effect tell us about the superconducting state of the cuprates?
R. Hlubina, M. Grajcar, E. Il'ichev
We review the recent measurements of the current-phase relation in cuprate Josephson junctions. Special attention is paid to 45 degree grain boundary junctions and to c-axis juncti…
Degenerate ground state in a mesoscopic YBaCuO grain boundary Josephson junction
E. Il'ichev, M. Grajcar, R. Hlubina +8
We have measured the current-phase relationship (CPR) of symmetric 45 degree YBaCuO grain boundary Josephson junctions. Substantial deviations of the CPR from conventional tunnel-j…