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 …
1/f noise: Implications for solid-state quantum information
The efficiency of the future devices for quantum information processing is limited mostly by
the finite decoherence rates of the individual qubits and quantum gates. Recently …
the finite decoherence rates of the individual qubits and quantum gates. Recently …
Phonon engineering of atomic-scale defects in superconducting quantum circuits
Noise within solid-state systems at low temperatures can typically be traced back to material
defects. In amorphous materials, these defects are broadly described by the tunneling two …
defects. In amorphous materials, these defects are broadly described by the tunneling two …
Strain tuning of individual atomic tunneling systems detected by a superconducting qubit
GJ Grabovskij, T Peichl, J Lisenfeld, G Weiss… - Science, 2012 - science.org
In structurally disordered solids, some atoms or small groups of atoms are able to quantum
mechanically tunnel between two nearly equivalent sites. These atomic tunneling systems …
mechanically tunnel between two nearly equivalent sites. These atomic tunneling systems …
Lifetime and coherence of two-level defects in a Josephson junction
We measure the lifetime (T 1) and coherence (T 2) of two-level defect states (TLSs) in the
insulating barrier of a Josephson phase qubit and compare to the interaction strength …
insulating barrier of a Josephson phase qubit and compare to the interaction strength …
Projected dipole moments of individual two-level defects extracted using circuit quantum electrodynamics
Material-based two-level systems (TLSs), appearing as defects in low-temperature devices
including superconducting qubits and photon detectors, are difficult to characterize. In this …
including superconducting qubits and photon detectors, are difficult to characterize. In this …
Memory-keeping effects and forgetfulness in the dynamics of a qubit coupled to a spin chain
TJG Apollaro, C Di Franco, F Plastina… - Physical Review A …, 2011 - APS
Using recently proposed measures for non-Markovianity [H.-P. Breuer, EM Laine, and J.
Piilo, Phys. Rev. Lett. 103, 210401 (2009) PRLTAO 0031-9007 10.1103/PhysRevLett …
Piilo, Phys. Rev. Lett. 103, 210401 (2009) PRLTAO 0031-9007 10.1103/PhysRevLett …
Tunable quantum beam splitters for coherent manipulation of a solid-state tripartite qubit system
G Sun, X Wen, B Mao, J Chen, Y Yu, P Wu… - Nature …, 2010 - nature.com
Coherent control of quantum states is at the heart of implementing solid-state quantum
processors and testing quantum mechanics at the macroscopic level. Despite significant …
processors and testing quantum mechanics at the macroscopic level. Despite significant …
Identification of different types of high-frequency defects in superconducting qubits
Parasitic two-level-system (TLS) defects are one of the major factors limiting the coherence
times of superconducting qubits. Although there has been significant progress in …
times of superconducting qubits. Although there has been significant progress in …
Probing defect densities at the edges and inside Josephson junctions of superconducting qubits
Tunneling defects in disordered materials form spurious two-level systems which are a
major source of decoherence for micro-fabricated quantum devices. For superconducting …
major source of decoherence for micro-fabricated quantum devices. For superconducting …