Quantum Zeno effect in the Cooper-pair transport through a double-island Josephson system

Abstract

Motivated by recent experiments, we analyze transport of Cooper pairs through a double-island Josephson qubit. At low bias in a certain range of gate voltages coherent superpositions of charge states play a crucial role. Analysis of the evolution of the density matrix allows us to cover a wide range of parameters, incl. situations with degenerate levels, when dissipation strongly affects the coherent eigenstates. At high noise levels the so-called Zeno effect can be observed, which slows down the transport. Our analysis explains certain features of the I-V curves, in particular the visibility and shape of resonant peaks and lines.

References in corpus (4)

• Quantum state engineering with Josephson-junction devices
• Quantum Manipulations of Small Josephson Junctions
• Mesoscopic quantum transport: Resonant tunneling in the presence of strong Coulomb interaction
• Charge Transport in Voltage-Biased Superconducting Single-Electron Transistors

Cited by in corpus (5)

• Quantum simulation of the spin-boson model with a microwave circuit
• Tunneling of Cooper pairs across voltage biased asymmetric single-Cooper-pair transistors
• Effect of decoherence on resonant Cooper-pair tunneling in a voltage-biased single-Cooper-pair transistor
• Effects of quasiparticle tunneling in a circuit-QED realization of a strongly driven two-level system
• Properties of a single photon generated by a solid-state emitter: effects of pure dephasing