Controlling superfluid flows using dissipative impurities

• URL: http://arxiv.org/abs/2208.02499v1
• Date: Thu, 4 Aug 2022 07:16:33 GMT
• Title: Controlling superfluid flows using dissipative impurities
• Authors: Martin Will, Jamir Marino, Herwig Ott, Michael Fleischhauer
• Abstract summary: Noise tuning can be employed to control, stabilize or eventually shunt the superfluid transport of particles along the segment which connects them. We show that noise tuning can be employed to control, stabilize or eventually shunt the superfluid transport of particles along the segment which connects them.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose and analyze a protocol to create and control the superfluid flow in a one dimensional, weakly interacting Bose gas by noisy point contacts coupled to the density of the bosons. Considering first a single contact in a static or moving condensate, we identify three different dynamical phases: I. a linear response regime, where the noise induces a coherent flow in proportion to the strength of the noise accompanied by a counterflow of the normal component of the gas, II. a Zeno regime with suppressed currents and negative differential current to noise characteristics, and III. for a non-vanishing relative velocity, a regime of continuous soliton emission. The velocity of the condensate at the dissipative impurity determines the threshold for Zeno suppression of the current through the point contact, and the onset of the non-stationary regime of soliton "shooting" from the defect. Generalizing to two point contacts in a condensate at rest we show that noise tuning can be employed to control, stabilize or eventually shunt the superfluid transport of particles along the segment which connects them, with perspectives for an atomtronic analogue of a superfluid-current source for studying quantum transport phenomena.

Related papers

• Static impurity in a mesoscopic system of SU($N$) fermionic matter-waves [0.0]
  We show that the impurity opens a gap in the energy spectrum selectively, constrained by the total effective spin and interaction. Our findings hold significance for the fundamental understanding of the localized impurity problem and its potential applications for sensing and interferometry in quantum technology.
  arXiv  Detail & Related papers  (2024-11-21T19:25:14Z)
• Acceleration-induced transport of quantum vortices in joined atomtronic circuits [0.0]
  acceleration influences transfer of persistent currents between two density-connected, ring-shaped atomic Bose-Einstein condensates. We find that the acceleration modifies both the density and phase dynamics between the rings, leading to a bias in the periodic vortex oscillations. We analyze how this transfer depends on the weak-link amplitude, the initial persistent current configuration, and the acceleration strength and direction.
  arXiv  Detail & Related papers  (2024-10-31T11:02:10Z)
• Dynamics of polaron formation in 1D Bose gases in the strong-coupling regime [0.0]
  We discuss the dynamics of the formation of a Bose polaron when an impurity is injected into a weakly interacting Bose condensate. We use Truncated Wigner simulations to show under what conditions the influence of quantum fluctuations is small.
  arXiv  Detail & Related papers  (2023-04-27T19:55:18Z)
• Probing flux and charge noise with macroscopic resonant tunneling [45.36850110238202]
  We measure rates of incoherent tunneling from the lowest energy state in the initial well to the ground. We develop a theoretical model that allows us to extract information about flux and charge noise within one experimental setup.
  arXiv  Detail & Related papers  (2022-10-04T16:15:34Z)
• Multilevel resonant tunneling in the presence of flux and charge noise [64.0476282000118]
  Macroscopic resonant tunneling (MRT) in flux qubits is an important experimental tool for extracting information about noise produced by a qubit's surroundings. We present a detailed derivation of the MRT signal in the RF-SQUID flux qubit allowing for effects of flux and charge fluctuations on the interwell and intrawell transitions in the system.
  arXiv  Detail & Related papers  (2022-09-21T18:59:36Z)
• Stabilizing and improving qubit coherence by engineering noise spectrum of two-level systems [52.77024349608834]
  Superconducting circuits are a leading platform for quantum computing. Charge fluctuators inside amorphous oxide layers contribute to both low-frequency $1/f$ charge noise and high-frequency dielectric loss. We propose to mitigate those harmful effects by engineering the relevant TLS noise spectral densities.
  arXiv  Detail & Related papers  (2022-06-21T18:37:38Z)
• Rotating Bose gas dynamically entering the lowest Landau level [0.0]
  We model the dynamics of a condensed Bose gas in a rotating anisotropic trap. The condensate stretches along one direction and is squeezed along another, becoming long and thin. This preparation of a lowest Landau level condensate can be an important first step in realizing bosonic analogs of quantum Hall states.
  arXiv  Detail & Related papers  (2021-11-19T19:52:40Z)
• Quantum asymmetry and noisy multi-mode interferometry [55.41644538483948]
  Quantum asymmetry is a physical resource which coincides with the amount of coherence between the eigenspaces of a generator. We show that the asymmetry may emphincrease as a result of a emphdecrease of coherence inside a degenerate subspace.
  arXiv  Detail & Related papers  (2021-07-23T07:30:57Z)
• Localization Dynamics from Static and Mobile Impurities [3.803244458097104]
  We study the superfluid response and localization dynamics from static and mobile impurities. The superfluidity is formed in the rung-Mott phase of a bosonic ladder model. We study the superfluid currents both in the weakly-coupled and strongly-coupled rungs limits for the bosons.
  arXiv  Detail & Related papers  (2021-01-16T10:10:06Z)
• Universal non-adiabatic control of small-gap superconducting qubits [47.187609203210705]
  We introduce a superconducting composite qubit formed from two capacitively coupled transmon qubits. We control this low-frequency CQB using solely baseband pulses, non-adiabatic transitions, and coherent Landau-Zener interference. This work demonstrates that universal non-adiabatic control of low-frequency qubits is feasible using solely baseband pulses.
  arXiv  Detail & Related papers  (2020-03-29T22:48:34Z)
• Zitterbewegung and Klein-tunneling phenomena for transient quantum waves [77.34726150561087]
  We show that the Zitterbewegung effect manifests itself as a series of quantum beats of the particle density in the long-time limit. We also find a time-domain where the particle density of the point source is governed by the propagation of a main wavefront. The relative positions of these wavefronts are used to investigate the time-delay of quantum waves in the Klein-tunneling regime.
  arXiv  Detail & Related papers  (2020-03-09T21:27:02Z)

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.