Demonstration of nonlocal Josephson effect in Andreev molecules

Abstract

We perform switching current measurements of planar Josephson junctions (JJs) coupled by a common superconducting electrode, with independent control over the two superconducting phase differences. We observe an anomalous phase shift in the current--phase relation of a JJ as a function of gate voltage or phase difference in the second JJ. This demonstrates a nonlocal Josephson effect, and the implementation of a ${\phi }_0$-junction which is tunable both electrostatically and magnetically. The anomalous phase shift was larger for shorter distances between the JJs and vanished for distances much longer than the superconducting coherence length. Results are consistent with the hybridization of ABSs, leading to the formation of an Andreev molecule. Our devices constitute a realization of a tunable superconducting phase source, and could enable new coupling schemes for hybrid quantum devices.

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Cited by in corpus (22)

• Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction
• Josephson Diode Effect in Andreev Molecules
• Phase-dependent Andreev molecules and superconducting gap closing in coherently coupled Josephson junctions
• Engineering of anomalous Josephson effect in coherently coupled Josephson junctions
• Non-Hermitian multiterminal phase-biased Josephson junctions
• Strong nonlocal tuning of the current-phase relation of a quantum dot based Andreev molecule
• Zeeman and Orbital Driven Phase Transitions in Planar Josephson Junctions
• Spin-degeneracy breaking and parity transitions in three-terminal Josephson junctions
• The carbon nanotube gatemon qubit
• Josephson junction π-0 transition induced by orbital hybridization in a double quantum dot
• Flux-tunable Josephson Effect in a Four-Terminal Junction
• Quartet Tomography in Multiterminal Josephson Junctions
• Long-range coupling between superconducting dots induced by periodic driving
• Josephson junctions based on ultraclean carbon nanotubes
• Josephson diode effect in nanowire-based Andreev molecules
• Fermionic Quantum Simulation on Andreev Bound State Superlattices
• Nonlocal Josephson diode effect in minimal Kitaev chains
• Exploring the energy spectrum of a four-terminal Josephson junction: Towards topological Andreev band structures
• Phase-Biased Andreev Diffraction Grating
• Directional conductance of Andreev crystals in hybrid Josephson junction arrays
• Andreev molecules at distance
• Towards a $\cos (2\phi )$ Josephson element using aluminum junctions with well-transmitted channels