Quantum electrodynamics and photon-assisted tunnelling in long Josephson junctions

Abstract

We describe the interaction between an electromagnetic field and a long Josephson junction (JJ) driven by a dc current. We calculate the amplitudes of emission and absorption of light via the creation and annihilation of quantized Josephson plasma waves (JPWs). Both, the energies of JPW quanta and the amplitudes of light absorption and emission, strongly depend on the junction's length and can be tuned by an applied dc current. Moreover, photon-assisted macroscopic quantum tunnelling in long Josephson junctions show resonances when the frequency of the outside radiation coincides with the current-driven eigenfrequencies of the quantized JPWs.

9 pages, 4 figures

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Cited by in corpus (5)

• Theory of macroscopic quantum tunneling with Josephson-Leggett collective excitations in multi-band superconducting Josephson junctions
• Asymmetric long Josephson junction acting as a ratchet for a quantum field
• Macroscopic quantum tunneling and phase diffusion in a La${}_{2-x}$Sr${}_x$CuO${}_4$ intrinsic Josephson junction stack
• Effects of Resonant Cavity on Macroscopic Quantum Tunneling of Fluxon in Long Josephson Junctions
• Extended Josephson junction qubit system