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 …

Quantum electromechanical systems are nano-to-micrometer (micron) scale mechanical
resonators coupled to electronic devices of comparable dimensions, such that the …

Superconducting circuits can behave like atoms making transitions between two levels.
Such circuits can test quantum mechanics at macroscopic scales and be used to conduct …

Decoherence in quantum bit circuits is presently a major limitation to their use for quantum
computing purposes. We present experiments, inspired from NMR, that characterize …

We theoretically investigate the influence of designed pulse sequences in restoring quantum
coherence lost due to background noise in superconducting qubits. We consider both 1/f …

The tunnelling of quasiparticles across Josephson junctions in superconducting quantum
circuits is an intrinsic decoherence mechanism for qubit degrees of freedom. Understanding …

We investigate the quantum dynamics of a Cooper-pair box with a superconducting loop in
the presence of a nonclassical microwave field. We demonstrate the existence of Rabi …

We calculate for the current-biased Josephson junction the decoherence of the qubit state
from noise and dissipation. The effect of dissipation can be entirely accounted for through a …

We have studied the dephasing of a superconducting flux qubit coupled to a dc-SQUID
based oscillator. By varying the bias conditions of both circuits we were able to tune their …

Solid-state quantum computer architectures with qubits encoded using single atoms are now
feasible given recent advances in the atomic doping of semiconductors. Here we present a …