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Stabilizing persistent currents in an atomtronic Josephson junction necklace.

Luca Pezzè1,2,3, Klejdja Xhani4,5,6, Cyprien Daix5,7

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Atomtronic Josephson junction arrays show enhanced stability with more junctions, enabling higher critical currents for quantum technologies. This contrasts with decreasing superfluid fraction, highlighting their potential for atomtronics and quantum state superposition.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Atomtronics

Background:

  • Arrays of Josephson junctions are crucial for quantum computing, simulation, and metrology.
  • They serve as platforms to study quantum phenomena like phase coherence and dissipation.

Purpose of the Study:

  • To realize and investigate finite-circulation states in an atomtronic Josephson junction necklace.
  • To explore the stability of atomic flow in response to varying circulation and junction numbers.

Main Methods:

  • Utilized a tunable array of tunneling links in a ring-shaped superfluid.
  • Theoretically predicted and experimentally demonstrated atomic circuit stability.
  • Quantified superfluid fraction using Leggett's criterion.

Main Results:

  • Atomic circuits withstand higher circulations (critical currents) with an increased number of Josephson links.
  • Superfluid fraction decreases with more junctions due to density depletion.
  • Demonstrated enhanced stability in mesoscopic structured ring potentials.

Conclusions:

  • Atomtronic Josephson junction arrays are promising for atomtronics applications.
  • These systems offer potential for observing non-trivial macroscopic superpositions of current states.
  • The study provides insights into the interplay between stability and superfluidity in quantum circuits.