Towards understanding two-level-systems in amorphous solids: insights from quantum circuits
Amorphous solids show surprisingly universal behaviour at low temperatures. The
prevailing wisdom is that this can be explained by the existence of two-state defects within …
prevailing wisdom is that this can be explained by the existence of two-state defects within …
Materials loss measurements using superconducting microwave resonators
The performance of superconducting circuits for quantum computing is limited by materials
losses. In particular, coherence times are typically bounded by two-level system (TLS) …
losses. In particular, coherence times are typically bounded by two-level system (TLS) …
Localization and mitigation of loss in niobium superconducting circuits
Materials imperfections in planar superconducting quantum circuits—in particular, two-level-
system (TLS) defects—contribute significantly to decoherence, ultimately limiting the …
system (TLS) defects—contribute significantly to decoherence, ultimately limiting the …
Evidence for interacting two-level systems from the 1/f noise of a superconducting resonator
The performance of a great variety of electronic devices—ranging from semiconductor
transistors to superconducting qubits—is hampered by low-frequency noise with spectra …
transistors to superconducting qubits—is hampered by low-frequency noise with spectra …
Interacting tunneling model for two-level systems in amorphous materials and its predictions for their dephasing and noise in superconducting microresonators
We use a tunneling model for two-level systems in insulators that takes into account the
interaction between them and a slow power-law dependence of their density of states. We …
interaction between them and a slow power-law dependence of their density of states. We …
Analysis of high quality superconducting resonators: consequences for TLS properties in amorphous oxides
$1/f $ noise caused by microscopic Two-Level Systems (TLS) is known to be very
detrimental to the performance of superconducting quantum devices but the nature of these …
detrimental to the performance of superconducting quantum devices but the nature of these …
Noise and loss of superconducting aluminium resonators at single photon energies
The loss and noise mechanisms of superconducting resonators are useful tools for
understanding decoherence in superconducting circuits. While the loss mechanisms have …
understanding decoherence in superconducting circuits. While the loss mechanisms have …
Tunable superconducting microstrip resonators
AA Adamyan, SE Kubatkin, AV Danilov - Applied Physics Letters, 2016 - pubs.aip.org
We report on a simple yet versatile design for a tunable superconducting microstrip
resonator. Niobium nitride is employed as the superconducting material and aluminum …
resonator. Niobium nitride is employed as the superconducting material and aluminum …
Low-temperature noise in microwave dielectric constant of amorphous dielectrics in Josephson qubits
The analytical solution for the low-temperature 1/f noise in the microwave dielectric constant
of amorphous films at frequency ν 0∼ 5 GHz due to tunneling two-level systems (TLSs) is …
of amorphous films at frequency ν 0∼ 5 GHz due to tunneling two-level systems (TLSs) is …
Readout of quantum devices with a sideband microwave interferometer immune to systematic noise
The accuracy of microwave measurements is not only critical for applications in
telecommunication and radar but also for future quantum computers. Qubit technologies …
telecommunication and radar but also for future quantum computers. Qubit technologies …