Quantum electrodynamic fluctuations of the macroscopic Josephson phase



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Kohler, Heiner and Guinea, Francisco and Sols, Ignacio (2004) Quantum electrodynamic fluctuations of the macroscopic Josephson phase. Annals of Physics, 310 (1). pp. 127-154. ISSN 0003-4916

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Official URL: http://www.sciencedirect.com/science/article/pii/S0003491603002197


We study the equilibrium dynamics of the relative phase in a superconducting Josephson link taking into account the quantum fluctuations of the electromagnetic vacuum. The photons act as a superohmic heat bath on the relative Cooper pair number and thus, indirectly, on the macroscopic phase difference /. This leads to an enhancement of the mean square
h/2 i that adds to the spread due to the Coulomb interaction carried by the longitudinal electromagnetic field. We also include the interaction with the electronic degrees of freedom due to quasiparticle tunneling, which couple to the phase and only indirectly to the particle number.
The simultaneous inclusion of both the radiation field fluctuations and quasiparticle tunneling leads to a novel type of particle-bath Hamiltonian in which the quantum particle couples through its position and momentum to two independent bosonic heat baths. We study the interplay between the two mechanisms in the present context and find interference contributions to the quantum fluctuations of the phase. We explore the observability of the QED effects
discussed here.

Item Type:Article
Uncontrolled Keywords:Decoherence; Quantum dissipation; Josephson effect; Quantum electrodynamics; Macroscopic quantum mechanics
Subjects:Sciences > Chemistry > Mathematics
ID Code:22015
Deposited On:20 Jun 2013 13:55
Last Modified:27 Jul 2018 08:20

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