Implementation of an atomtronic SQUID in a strongly confined toroidal condensate

• URL: http://arxiv.org/abs/2204.03000v1
• Date: Wed, 6 Apr 2022 18:00:03 GMT
• Title: Implementation of an atomtronic SQUID in a strongly confined toroidal condensate
• Authors: Hannes Kiehn, Vijay Pal Singh, and Ludwig Mathey
• Abstract summary: atomtronic SQUID created by two mobile barriers, moving at two different, constant velocities in a quasi-1D toroidal condensate. Relative velocity of the two barriers results in a chemical potential imbalance analogous to a voltage in an electronic system. Average velocity of the two barriers corresponds to a rotation of the condensate, analogous to a magnetic flux.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate the dynamics of an atomtronic SQUID created by two mobile barriers, moving at two different, constant velocities in a quasi-1D toroidal condensate. We implement a multi-band truncated Wigner approximation numerically, to demonstrate the functionality of a SQUID reflected in the oscillatory voltage-flux dependence. The relative velocity of the two barriers results in a chemical potential imbalance analogous to a voltage in an electronic system. The average velocity of the two barriers corresponds to a rotation of the condensate, analogous to a magnetic flux. We demonstrate that the voltage equivalent shows characteristic flux-dependent oscillations. We point out the parameter regime of barrier heights and relaxation times for the phase slip dynamics, resulting in a realistic protocol for atomtronic SQUID operation.

Related papers

• Superfluid Oscillator Circuit with Quantum Current Regulator [6.676165951264428]
  We examine the properties of atomic current in a superfluid circuit consisting of a mesoscopic channel that connects two reservoirs of a Bose-Einstein condensate. Our findings indicate that the circuit demonstrates characteristics of both voltage-limiting and current-limiting mechanisms.
  arXiv  Detail & Related papers  (2024-03-28T07:42:06Z)
• 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)
• Unconditional Wigner-negative mechanical entanglement with linear-and-quadratic optomechanical interactions [62.997667081978825]
  We propose two schemes for generating Wigner-negative entangled states unconditionally in mechanical resonators. We show analytically that both schemes stabilize a Wigner-negative entangled state that combines the entanglement of a two-mode squeezed vacuum with a cubic nonlinearity. We then perform extensive numerical simulations to test the robustness of Wigner-negative entanglement attained by approximate CPE states stabilized in the presence of thermal decoherence.
  arXiv  Detail & Related papers  (2023-02-07T19:00:08Z)
• Photon generation and entanglement in a double superconducting cavity [105.54048699217668]
  We study the dynamical Casimir effect in a double superconducting cavity in a quantum electrodynamics architecture. We study the creation of photons when the walls oscillate harmonically with a small amplitude.
  arXiv  Detail & Related papers  (2022-07-18T16:43:47Z)
• Rotation-driven transition into coexistent Josephson modes in an atomtronic dc-SQUID [0.0]
  We show that transitions to different arrays of coexistent regimes in the phase space can be attained by rotating a double-well system. In particular, we show that within a determined rotation frequency interval, a hopping parameter, usually disregarded in nonrotating systems, turns out to rule the dynamics.
  arXiv  Detail & Related papers  (2021-11-19T14:47:54Z)
• Distant emitters in ultrastrong waveguide QED: Ground-state properties and non-Markovian dynamics [0.0]
  We study the properties of a system of two distant two-level emitters coupled to a one-dimensional Ohmic waveguide. We introduce non-Markovianity arising from delay-feedback effects in two distant emitters in the so-called ultrastrong coupling regime. In particular, we revisit the Fermi two-atom problem showing that, in the USC regime, initial correlations yield two different evolutions for symmetric and antisymmetric states.
  arXiv  Detail & Related papers  (2021-06-05T19:21:00Z)
• dc to ac Josephson transition in a dc atom superconducting quantum interference device [0.0]
  We analyze the effect of the barrier motion on the Bose-Hubbard Hamiltonian of a ring-shaped Bose-Einstein condensate interrupted by a pair of Josephson junctions. Such an effect is also shown to modify the Heisenberg equation of motion of the boson field operator.
  arXiv  Detail & Related papers  (2020-08-02T17:34:11Z)
• Cat states in a driven superfluid: role of signal shape and switching protocol [62.997667081978825]
  We investigate the behavior of a one-dimensional Bose-Hubbard model whose kinetic energy is made to oscillate with zero time-average. We analyze the robustness of this unconventional ground state against variations of a number of system parameters.
  arXiv  Detail & Related papers  (2020-05-11T15:15:06Z)
• Switching dynamics of single and coupled VO2-based oscillators as elements of neural networks [55.41644538483948]
  We report on the switching dynamics of both single and coupled VO2-based oscillators, with resistive and capacitive coupling, and explore the capability of their application in neural networks. For the resistive coupling, it is shown that synchronization takes place at a certain value of the coupling resistance, though it is unstable and a synchronization failure occurs periodically. For the capacitive coupling, two synchronization modes, with weak and strong coupling, are found. The transition between these modes is accompanied by chaotic oscillations.
  arXiv  Detail & Related papers  (2020-01-07T02:16:04Z)
• Thermal coupling and effect of subharmonic synchronization in a system of two VO2 based oscillators [55.41644538483948]
  We explore a prototype of an oscillatory neural network (ONN) based on vanadium dioxide switching devices. The effective action radius RTC of coupling depends both on the total energy released during switching and on the average power. In the case of a strong thermal coupling, the limit of the supply current parameters, for which the oscillations exist, expands by 10 %. The effect of subharmonic synchronization hold promise for application in classification and pattern recognition.
  arXiv  Detail & Related papers  (2020-01-06T03:26:53Z)

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.