Direct detection of the parametrically generated half‐harmonic voltage in a Josephson tunnel junction

Josephson tunnel junction microwave attenuator

Josephson tunnel junction controlled by quasiparticle injection

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Nonclassical photon pair production in a voltage-biased Josephson junction.

We investigate electromagnetic radiation emitted by a small voltage-biased Josephson junction connected to a superconducting transmission line. At frequencies below the well-known emission peak at the Josephson frequency (2eV/h), extra radiation is triggered by quantum fluctuations in the transmission line. For weak tunneling couplings and typical Ohmic transmission lines, the corresponding pho...

Direct observation of dynamical bifurcation in a superfluid Josephson junction.

We report a direct observation of dynamical bifurcation between two plasma oscillation states of a superfluid Josephson junction. We excite the superfluid plasma resonance into a nonlinear regime by driving below the natural plasma frequency and observe a clear transition between two dynamical states. We also demonstrate bifurcation by changing the potential well with temperature variations.

Influence of Thermal Fluctuations on an Underdamped Josephson Tunnel Junction

Inspired by a recent experiment, we study the influence of thermal fluctuations on the I-V characteristics of a Josephson junction, coupled to a strongly resistive environment. We obtain analytical results in the limit where the Josephson energy is larger than the charging energy and quasiparticles are absent.