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Dephasing of Josephson qubits close to optimal points
S. V. Syzranov, Yu. Makhlin
Decoherence of Josephson qubits can be substantially reduced by tuning their parameters to optimal operation points, with only quadratic coupling to fluctuations. We analyze dephas…
Decoherence from ensembles of two-level fluctuators
Josef Schriefl, Yuriy Makhlin, Alexander Shnirman +1
1/f noise, the major source of dephasing in Josephson qubits, may be produced by an ensemble of two-level systems. Depending on the statistical properties of their distribution, th…
Landau-Zener interferometry with superconducting qubits
Mika Sillanpaa, Teijo Lehtinen, Antti Paila +2
Quantum-mechanical systems having two discrete energy levels are ubiquitous in nature. For crossing energy levels, depending on how fast they approach each other, there is a possib…
Decoherence in a superconducting quantum bit circuit
G. Ithier, E. Collin, P. Joyez +8
Decoherence in quantum bit circuits is presently a major limitation to their use for quantum computing purposes. We present experiments, inspired from NMR, that characterise decohe…
Direct Observation of Josephson Capacitance
M. A. Sillanpaa, T. Lehtinen, A. Paila +3
The effective capacitance has been measured in the split Cooper pair box (CPB) over its phase-gate bias plane. Our low-frequency reactive measurement scheme allows to probe purely…
Low- and high-frequency noise from coherent two-level systems
Alexander Shnirman, Gerd Schön, Ivar Martin +1
Recent experiments indicate a connection between the low- and high-frequency noise affecting superconducting quantum systems. We explore the possibilities that both noises can be p…