717 citations · 1.7k across the 15 of their papers we have counts for
15 papers
Quantum microwave parametric interferometer
F. Kronowetter, F. Fesquet, M. Renger +7
Classical interferometers are indispensable tools for the precise determination of various physical quantities. Their accuracy is bound by the standard quantum limit. This limit ca…
Probing the symmetry breaking of a light--matter system by an ancillary qubit
Shuai-Peng Wang, Alessandro Ridolfo, Tiefu Li +4
Hybrid quantum systems in the ultrastrong, and even more in the deep-strong, coupling regimes can exhibit exotic physical phenomena and promise new applications in quantum technolo…
Flow of quantum correlations in noisy two-mode squeezed microwave states
M. Renger, S. Pogorzalek, F. Fesquet +10
We study nonclassical correlations in propagating two-mode squeezed microwave states in the presence of noise. We focus on two different types of correlations, namely, quantum enta…
Spectroscopic observation of the crossover from a classical Duffing oscillator to a Kerr parametric oscillator
T. Yamaji, S. Kagami, A. Yamaguchi +6
We study microwave response of a Josephson parametric oscillator consisting of a superconducting transmission-line resonator with an embedded dc-SQUID. The dc-SQUID allows to contr…
Brillouin light scattering by magnetic quasi-vortices in cavity optomagnonics
A. Osada, A. Gloppe, R. Hisatomi +5
A ferromagnetic sphere can support \textit{optical vortices} in forms of whispering gallery modes and \textit{magnetic quasi-vortices} in forms of magnetostatic modes with non-triv…
Information-to-work conversion by Maxwell's demon in a superconducting circuit-QED system
Y. Masuyama, K. Funo, Y. Murashita +6
The gedanken experiment of Maxwell's demon has led to the studies concerning the foundations of thermodynamics and statistical mechanics. The demon measures fluctuations of a syste…
Finite-time quantum entanglement in propagating squeezed microwaves
Kirill G. Fedorov, S. Pogorzalek, U. Las Heras +13
Two-mode squeezing is a fascinating example of quantum entanglement manifested in cross-correlations of incompatible observables between two subsystems. At the same time, these sub…
Displacement of propagating squeezed microwave states
Kirill G. Fedorov, L. Zhong, S. Pogorzalek +16
Displacement of propagating quantum states of light is a fundamental operation for quantum communication. It enables fundamental studies on macroscopic quantum coherence and plays…
Dephasing and dissipation in qubit thermodynamics
J. P. Pekola, Y. Masuyama, Y. Nakamura +2
We analyze the stochastic evolution and dephasing of a qubit within the quantum jump (QJ) approach. It allows one to treat individual realizations of inelastic processes, and in th…
Josephson parametric phase-locked oscillator and its application to dispersive readout of superconducting qubits
Z. R. Lin, K. Inomata, K. Koshino +4
The parametric phase-locked oscillator (PPLO), also known as a parametron, is a resonant circuit in which one of the reactances is periodically modulated. It can detect, amplify, a…
Observation of three-state dressed states in circuit quantum electrodynamics
K. Koshino, H. Terai, K. Inomata +4
We have investigated the microwave response of a transmon qubit coupled directly to a transmission line. In a transmon qubit, owing to its weak anharmonicity, a single driving fiel…
Damping in high-frequency metallic nanomechanical resonators
F. Hoehne, Yu. A. Pashkin, O. Astafiev +4
We have studied damping in polycrystalline Al nanomechanical resonators by measuring the temperature dependence of their resonance frequency and quality factor over a temperature r…
Quantum oscillations in two coupled charge qubits
Yu. A. Pashkin, T. Yamamoto, O. Astafiev +3
Despite an apparent progress in implementing individual solid-state qubits, there have been no experimental reports so far on multi-bit gates required for building a real quantum c…
Charge echo in a Cooper-pair box
Y. Nakamura, Yu. A. Pashkin, T. Yamamoto +1
A spin-echo-type technique is applied to an artificial two-level system that utilizes charge degree of freedom in a small superconducting electrode. Gate-voltage pulses are used to…
Singularity-matching peaks in superconducting single-electron transistor
Y. Nakamura, A. N. Korotkov, C. D. Chen +1
We report the experimental observation of the recently predicted peaks on the I-V curve of the superconducting single-electron transistor at relatively high temperatures. The peaks…