Proposal for the observation of nonlocal multipair production: the biSQUID

Abstract

We propose an all-superconducting three-terminal setup consisting in a carbon nanotube (or semiconducting nanowire) contacted to three superconducting leads. The resulting device, referred to as a "biSQUID", is made of four quantum dots arranged in two loops of different surface area. We show how this biSQUID can prove a useful tool to probe nonlocal quantum phenomena in an interferometry setup. We study the measured critical current as a function of the applied magnetic field, which shows peaks in its Fourier spectrum, providing clear signatures of multipair Josephson processes. The device does not require any specific fine-tuning as these features are observed for a wide range of microscopic parameters -- albeit with a non-trivial dependence. Competing effects which may play a significant role in actual experimental realizations are also explored.

13 pages, 9 figures

References in corpus (6)

• Near-unity Cooper pair splitting efficiency
• Production of non-local quartets and phase-sensitive entanglement in a superconducting beam splitter
• Current and noise correlations in a double dot Cooper pair beam splitter
• Voltage-induced Shapiro steps in a superconducting multi-terminal structure
• Multiple Andreev reflections in hybrid multiterminal junctions
• Large oscillating non-local voltage in multi-terminal single wall carbon nanotube devices

Cited by in corpus (6)

• Simple Floquet-Wannier-Stark-Andreev viewpoint and emergence of low-energy scales in a voltage-biased three-terminal Josephson junction
• A quantum interferometer for quartets in superconducting three-terminal Josephson junctions
• Quartets and the Current-Phase Structure of a Double Quantum Dot Superconducting Bijunction at Equilibrium
• Theory of non-equilibrium noise in general multi-terminal superconducting hydrid devices: application to multiple Cooper pair resonances
• Quartet Tomography in Multiterminal Josephson Junctions
• Revisiting the adiabatic limit in ballistic multiterminal Josephson junctions