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Dephasing of qubits by transverse low-frequency noise
Yuriy Makhlin, Alexander Shnirman
We analyze the dissipative dynamics of a two-level quantum system subject to low-frequency, e.g. 1/f noise, motivated by recent experiments with superconducting quantum circuits. W…
Nondemolition measurements of a single quantum spin using Josephson oscillations
L. Bulaevskii, M. Hruška, A. Shnirman +2
We consider a Josephson junction containing a single localized spin 1/2 between conventional singlet superconducting electrodes. We study the spin dynamics and measurements when a…
Quantum Zeno effect in the Cooper-pair transport through a double-island Josephson system
Alexander Shnirman, Yuriy Makhlin
Motivated by recent experiments, we analyze transport of Cooper pairs through a double-island Josephson qubit. At low bias in a certain range of gate voltages coherent superpositio…
Dissipation in Josephson qubits
Yuriy Makhlin, Gerd Schön, Alexander Shnirman
We discuss the dissipative dynamics of superconducting qubits in the applicability range of the Bloch equations and beyond.
Dephasing of solid-state qubits at optimal points
Yuriy Makhlin, Alexander Shnirman
Motivated by recent experiments with Josephson-junction circuits, we analyze the influence of various noise sources on the dynamics of two-level systems at optimal operation points…
Spin-spin correlators in Majorana representation
Alexander Shnirman, Yuriy Makhlin
In the Majorana representation of a spin 1/2 we find an identity which relates spin-spin correlators to one-particle fermionic correlators. This should be contrasted with the strai…