Charge Oscillations in Superconducting Nanodevices Coupled to External Environments
arXiv:0711.0812 · doi:10.1016/j.physleta.2007.10.085
Abstract
Charge oscillations in certain nanodevices, more specifically the so-called Superconducting Cooper Pair Boxes (SCB), are usually interpreted as an effect of macroscopic quantum coherence; an alternative explanation is however possible in terms of the Gross-Pitaewski equation for the classical order parameter. These two explanations are based on different quantum states assigned to the SCB, occupation number states in the first case, coherent-like states in the second one. We show that, when the SCB is weakly coupled to an external source of noise and dissipation, occupation number states are much more unstable than coherent ones.
8 pages, LaTeX
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Cited by in corpus (5)
- Analytical approach to the two-site Bose-Hubbard model: from Fock states to Schrödinger cat states and entanglement entropy
- A Master Equation with Generalized Lindblad Form and a Unitary Transformation by the Squeezing Operator
- Cooper Pair Boxes Weakly Coupled to External Environments
- BCS model of Cooper Pair Box
- Quantum theory of the Josephson junction between finite islands