Stabilizing persistent currents in an atomtronic Josephson junction
necklace
- URL: http://arxiv.org/abs/2311.05523v1
- Date: Thu, 9 Nov 2023 17:08:09 GMT
- Title: Stabilizing persistent currents in an atomtronic Josephson junction
necklace
- Authors: Luca Pezz\`e, Klejdja Xhani, Cyprien Daix, Nicola Grani, Beatrice
Donelli, Francesco Scazza, Diego Hernandez-Rajkov, Woo Jin Kwon, Giulia Del
Pace, and Giacomo Roati
- Abstract summary: We realize finite-circulation states in an atomtronic Josephson junction necklace.
We study the stability diagram of the atomic flow by tuning both the circulation and the number of junctions.
- Score: 0.08728333291313056
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Arrays of Josephson junctions are at the forefront of research on quantum
circuitry for quantum computing, simulation and metrology. They provide a
testing bed for exploring a variety of fundamental physical effects where
macroscopic phase coherence, nonlinearities and dissipative mechanisms compete.
Here we realize finite-circulation states in an atomtronic Josephson junction
necklace, consisting of a tunable array of tunneling links in a ring-shaped
superfluid. We study the stability diagram of the atomic flow by tuning both
the circulation and the number of junctions. We predict theoretically and
demonstrate experimentally that the atomic circuit withstands higher
circulations (corresponding to higher critical currents) by increasing the
number of Josephson links. The increased stability contrasts with the trend of
the superfluid fraction -- quantified by Leggett's criterion -- which instead
decreases with the number of junctions and the corresponding density depletion.
Our results demonstrate atomic superfluids in mesoscopic structured ring
potentials as excellent candidates for atomtronics applications, with prospects
towards the observation of non-trivial macroscopic superpositions of current
states.
Related papers
- Probing Site-Resolved Current in Strongly Interacting Superconducting Circuit Lattices [0.0]
Transport measurements are fundamental for understanding condensed matter phenomena, from superconductivity to the fractional quantum Hall effect.
Here we demonstrate the measurement of in-situ particle current in a superconducting circuit lattice and apply it to study transport in both coherent and bath-coupled lattices.
arXiv Detail & Related papers (2024-03-18T17:08:04Z) - Dissipative preparation and stabilization of many-body quantum states in
a superconducting qutrit array [55.41644538483948]
We present and analyze a protocol for driven-dissipatively preparing and stabilizing a manifold of quantum manybody entangled states.
We perform theoretical modeling of this platform via pulse-level simulations based on physical features of real devices.
Our work shows the capacity of driven-dissipative superconducting cQED systems to host robust and self-corrected quantum manybody states.
arXiv Detail & Related papers (2023-03-21T18:02:47Z) - Characterizing quantum criticality and steered coherence in the XY-Gamma
chain [0.37498611358320727]
We analytically solve the one-dimensional short-range interacting case with the Jordan-Wigner transformation.
In the gapless phase, an incommensurate spiral order is manifested by the vector-chiral correlations.
We derive explicit scaling forms of the excitation gap near the quantum critical points.
arXiv Detail & Related papers (2022-06-08T15:28:10Z) - Correlated steady states and Raman lasing in continuously pumped and
probed atomic ensembles [68.8204255655161]
We consider an ensemble of Alkali atoms that are continuously optically pumped and probed.
Due to the collective scattering of photons at large optical depth, the steady state of atoms does not correspond to an uncorrelated tensor-product state.
We find and characterize regimes of Raman lasing, akin to the model of a superradiant laser.
arXiv Detail & Related papers (2022-05-10T06:54:54Z) - Josephson-like oscillations in toroidal spinor Bose-Einstein
condensates: a prospective symmetry probe [0.0]
We present an intriguing effect caused by a thin finite barrier in a quasi-one-dimensional toroidal spinor Bose--Einstein condensate (BEC)
In this system, the atomic current density flowing through the edges of the barrier oscillates, such as the electrical current through a Josephson junction in a superconductor.
We also show how the nontrivial broken-symmetry states of spinor BECs change the structure of this Josephson-like current, creating the possibility to probe the spinor symmetry.
arXiv Detail & Related papers (2022-04-17T04:54:11Z) - Tuning long-range fermion-mediated interactions in cold-atom quantum
simulators [68.8204255655161]
Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior.
Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
arXiv Detail & Related papers (2022-03-31T13:32:12Z) - Phase diagram of Rydberg-dressed atoms on two-leg square ladders:
Coupling supersymmetric conformal field theories on the lattice [52.77024349608834]
We investigate the phase diagram of hard-core bosons in two-leg ladders in the presence of soft-shoulder potentials.
We show how the competition between local and non-local terms gives rise to a phase diagram with liquid phases with dominant cluster, spin, and density-wave quasi-long-range ordering.
arXiv Detail & Related papers (2021-12-20T09:46:08Z) - Effect of Emitters on Quantum State Transfer in Coupled Cavity Arrays [48.06402199083057]
We study the effects of atoms in cavities which can absorb and emit photons as they propagate down the array.
Our model is equivalent to previously examined spin chains in the one-excitation sector and in the absence of emitters.
arXiv Detail & Related papers (2021-12-10T18:52:07Z) - A Reassessment of the Evidence for Macroscopic Quantum Tunneling in a
Josephson Junction [0.0]
Switching current distributions have played a key role in testing the conjecture of a macroscopic quantum state in junctions at millikelvin temperatures.
A different criterion is proposed here - the distance of the SCD peak from the junction critical current - and its efficacy is demonstrated.
For three example experiments, the evidence for a crossover to the conjectured macroscopic quantum state is unequivocally negative.
arXiv Detail & Related papers (2020-09-19T17:35:43Z) - Ionic polaron in a Bose-Einstein condensate [0.0]
The presence of strong interactions in a many-body quantum system can lead to a variety of exotic effects.
We show that even in a relatively simple setup the competition of length scales gives rise to a highly correlated state.
Our findings are directly relevant to experiments using hybrid atom-ion setups that have recently attained the ultracold regime.
arXiv Detail & Related papers (2020-05-25T11:10:34Z) - Quantum decoherence by Coulomb interaction [58.720142291102135]
We present an experimental study of the Coulomb-induced decoherence of free electrons in a superposition state in a biprism electron interferometer close to a semiconducting and metallic surface.
The results will enable the determination and minimization of specific decoherence channels in the design of novel quantum instruments.
arXiv Detail & Related papers (2020-01-17T04:11:44Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.