Effects of disorder and interactions on environment assisted quantum transport

• URL: http://arxiv.org/abs/2005.04462v1
• Date: Sat, 9 May 2020 15:19:02 GMT
• Title: Effects of disorder and interactions on environment assisted quantum transport
• Authors: Elinor Zerah-Harush and Yonatan Dubi
• Abstract summary: We show a surprising situation where the particle current grows with increasing disorder, even without dephasing. We show that repulsive interactions are detrimental to ENAQT, and lead to an environment-hampered quantum transport.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Understanding the interplay between disorder, environment and interactions is key to elucidating the transport properties of open quantum systems, from excitons in photosynthetic networks to qubits in ion traps. This interplay is studied here theoretically in the context of environment-assisted quantum transport (ENAQT), a unique situation in open system where an environment-induced dephasing can, counter-intuitively, enhance transport. First, we show a surprising situation where the particle current grows with increasing disorder, even without dephasing. Then, we suggest a specific mechanism for ENAQT (which we dub population uniformization) and demonstrate that it can explain the persistence of ENAQT deep into the disorder-induced localization regime. Finally, we show that repulsive interactions are detrimental to ENAQT, and lead to an environment-hampered quantum transport. Our predictions can readily be tested within the scope of particle current experimental capabilities.

Related papers

• Engineering Transport via Collisional Noise: a Toolbox for Biology Systems [44.99833362998488]
  We study a generalised XXZ model in the presence of collision noise, which allows to describe environments beyond the standard Markovian formulation. Results constitute an example of the essential building blocks for the understanding of quantum transport in noisy and warm disordered environments.
  arXiv  Detail & Related papers  (2023-11-15T12:55:28Z)
• Neural-network quantum states for ultra-cold Fermi gases [49.725105678823915]
  This work introduces a novel Pfaffian-Jastrow neural-network quantum state that includes backflow transformation based on message-passing architecture. We observe the emergence of strong pairing correlations through the opposite-spin pair distribution functions. Our findings suggest that neural-network quantum states provide a promising strategy for studying ultra-cold Fermi gases.
  arXiv  Detail & Related papers  (2023-05-15T17:46:09Z)
• From Goldilocks to Twin Peaks: multiple optimal regimes for quantum transport in disordered networks [68.8204255655161]
  Open quantum systems theory has been successfully applied to predict the existence of environmental noise-assisted quantum transport. This paper shows that a consistent subset of physically modelled transport networks can have at least two ENAQT peaks in their steady state transport efficiency.
  arXiv  Detail & Related papers  (2022-10-21T10:57:16Z)
• Formation of robust bound states of interacting microwave photons [148.37607455646454]
  One of the hallmarks of interacting systems is the formation of multi-particle bound states. We develop a high fidelity parameterizable fSim gate that implements the periodic quantum circuit of the spin-1/2 XXZ model. By placing microwave photons in adjacent qubit sites, we study the propagation of these excitations and observe their bound nature for up to 5 photons.
  arXiv  Detail & Related papers  (2022-06-10T17:52:29Z)
• From Non-Markovian Dissipation to Spatiotemporal Control of Quantum Nanodevices [0.0]
  We study how energy dissipated into the environment can be remotely harvested to create transient excited/reactive states. We also identify how reorganisation triggered by system excitation can qualitatively and reversibly alter the downstream' kinetics of a functional' quantum system.
  arXiv  Detail & Related papers  (2022-05-20T10:46:04Z)
• Noise-Assisted Discord-Like Correlations in Light-Harvesting Photosynthetic Complexes [0.0]
  We study the Environment-Assisted Quantum Transport (ENAQT) in terms of quantum correlations that go beyond entanglement. Our results suggest that quantum discord is a manifestation of the ENAQT and highlight the importance of beyond-entanglement correlations in photosynthetic energy transport processes.
  arXiv  Detail & Related papers  (2021-04-15T18:58:08Z)
• Simulation of Collective Neutrino Oscillations on a Quantum Computer [117.44028458220427]
  We present the first simulation of a small system of interacting neutrinos using current generation quantum devices. We introduce a strategy to overcome limitations in the natural connectivity of the qubits and use it to track the evolution of entanglement in real-time.
  arXiv  Detail & Related papers  (2021-02-24T20:51:25Z)
• Environment-assisted quantum transport and mobility edges [0.0]
  Environment-assisted quantum transport (ENAQT) is a unique situation where environmental noise can enhance the transport of an open quantum system. We find that the ENAQT increases by orders of magnitude and depends on the number of localized eigenstates and disorder strength nonmonotonically.
  arXiv  Detail & Related papers  (2020-12-17T00:35:50Z)
• Stochastic collision model approach to transport phenomena in quantum networks [0.0]
  Noise-assisted transport phenomena highlight the interplay between environmental effects and quantum coherence in achieving maximal efficiency. We introduce a new approach that combines an effective quantum microscopic description with a classical microscopic one. Our approach shows how to meaningfully formulate questions, and provide answers, on important open issues such as the properties of optimal noise and the emergence of the network structure as a result of an evolutionary process.
  arXiv  Detail & Related papers  (2020-10-12T11:43:43Z)
• Subdiffusion via Disordered Quantum Walks [52.77024349608834]
  We experimentally prove the feasibility of disordered quantum walks to realize a quantum simulator that is able to model general subdiffusive phenomena. Our experiment simulates such phenomena by means of a finely controlled insertion of various levels of disorder during the evolution of the walker. This allows us to explore the full range of subdiffusive behaviors, ranging from anomalous Anderson localization to normal diffusion.
  arXiv  Detail & Related papers  (2020-07-24T13:56:09Z)
• Einselection from incompatible decoherence channels [62.997667081978825]
  We analyze an open quantum dynamics inspired by CQED experiments with two non-commuting Lindblad operators. We show that Fock states remain the most robust states to decoherence up to a critical coupling.
  arXiv  Detail & Related papers  (2020-01-29T14:15:19Z)

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.