Decoherence in Exchange-Coupled Quantum Spin Qubit Systems: Impact of Multiqubit Interactions and Geometric Connectivity

• URL: http://arxiv.org/abs/2401.00725v2
• Date: Thu, 16 May 2024 11:37:34 GMT
• Title: Decoherence in Exchange-Coupled Quantum Spin Qubit Systems: Impact of Multiqubit Interactions and Geometric Connectivity
• Authors: Quan Fu, Jiahao Wu, Xin Wang,
• Abstract summary: We investigate the impact of different connectivities on the decoherence time in quantum systems under quasi-static Heisenberg noise. We find that rings exhibit greater stability compared to chains, contrary to the expectation that higher average connectivity leads to decreased stability.
• Score: 6.222054066855025
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate the impact of different connectivities on the decoherence time in quantum systems under quasi-static Heisenberg noise. We considered three types of elementary units, including node, stick and triangle and connect them into ring, chain, and tree configurations. We find that rings exhibit greater stability compared to chains, contrary to the expectation that higher average connectivity leads to decreased stability. Additionally, the stick configuration is more stable than the triangle configuration. We also observe similar trends in entanglement entropy and return probability, indicating their potential use in characterizing decoherence time. Our findings provide insights into the interplay between connectivity and stability in quantum systems, with implications for the design of robust quantum technologies and quantum error correction strategies.

Related papers

• Stability of Continuous Time Quantum Walks in Complex Networks [0.7864304771129751]
  We investigate the stability of continuous time quantum walks (CTQWs) in a range of network topologies.<n>The interplay of both network topology and decoherence model influences coherence.
  arXiv  Detail & Related papers  (2025-07-23T19:13:26Z)
• Impacts of Intrinsic Noise and Quantum Entanglement on the Geometric and Dynamical Properties of the XXZ Heisenberg Interacting Spin Model [0.0]
  We develop a unified framework that explores the interplay between geometry, dynamics, and entanglement in quantum systems.<n>We quantify entanglement using the concurrence measure and examine its evolution under decoherence.<n>We show that decoherence hinders geometric phase accumulation, while entanglement counteracts this effect, enhancing phase stability.
  arXiv  Detail & Related papers  (2025-07-23T12:19:12Z)
• Quantum channel for modeling spin-motion dephasing in Rydberg chains [44.99833362998488]
  We introduce a quantum channel to model the dissipative dynamics resulting from the coupling between spin and motional degrees of freedom in chains of neutral atoms with Rydberg interactions.<n>We benchmark the accuracy of our approach against exact diagonalization for small systems, identifying its regime of validity and the onset of perturbative breakdown.<n>We then apply the quantum channel to compute fidelity loss during transport of single-spin excitations across extended Rydberg chains in intractable regimes via exact diagonalization.
  arXiv  Detail & Related papers  (2025-06-30T17:37:38Z)
• Entanglement scaling and criticality of quantum many-body systems in canonical quantization picture using tensor network [0.0]
  This work investigates the quantum entanglement and criticality of the ground-state wave-functions of infinitely-many coupled quantum oscillators (iCQOs) By extending the imaginary-time evolution algorithm with translationally-invariant functional tensor network, we simulate the ground state of iCQOs with the presence of two- and three-body couplings. We reveal the logarithmic scaling law of entanglement entropy (EE) and the scaling law of correlation length against the virtual bond $chi$ at the dividing point of physical and non-physical regions.
  arXiv  Detail & Related papers  (2024-10-31T04:20:49Z)
• Harnessing spin-qubit decoherence to probe strongly-interacting quantum systems [0.0]
  We employ a single spin qubit to probe a strongly interacting system. By focusing on the XXZ spin chain, we observe diverse dynamics in the qubit evolution. This approach reveals the power of small quantum systems to probe the properties of large, strongly correlated quantum systems.
  arXiv  Detail & Related papers  (2024-10-29T12:51:55Z)
• Investigating the Impact of Qubit Velocity on Quantum Synchronization Dynamics [1.1068280788997427]
  We investigate the quantum synchronization dynamics of a moving qubit within a dissipative cavity environment. We find that the qubit's velocity and detuning influence synchronization, offering potential pathways to enhance coherence in quantum systems.
  arXiv  Detail & Related papers  (2024-09-02T19:16:16Z)
• An analysis of the relative effects of connectivity and coupling interactions on spin networks emulating the D-Wave 2000Q quantum annealer [0.19116784879310028]
  We show strong positive spatial correlations in qubits connected to qubits outside their own unit cell. We then show that correlation between nodes is affected by a number of factors. This highlights the importance of understanding the architectural features and potentially unprogrammed interactions/connections.
  arXiv  Detail & Related papers  (2024-05-14T13:51:05Z)
• Squeezing oscillations in a multimode bosonic Josephson junction [0.4335300149154109]
  We show how to enhance the quantum correlations in a one-dimensional multimode bosonic Josephson junction. Our work provides new ways for engineering correlations and entanglement in the external degree of freedom of interacting many-body systems.
  arXiv  Detail & Related papers  (2023-04-05T23:29:05Z)
• Trapped-Ion Quantum Simulation of Collective Neutrino Oscillations [55.41644538483948]
  We study strategies to simulate the coherent collective oscillations of a system of N neutrinos in the two-flavor approximation using quantum computation. We find that the gate complexity using second order Trotter- Suzuki formulae scales better with system size than with other decomposition methods such as Quantum Signal Processing.
  arXiv  Detail & Related papers  (2022-07-07T09:39:40Z)
• 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)
• Sensing quantum chaos through the non-unitary geometric phase [62.997667081978825]
  We propose a decoherent mechanism for sensing quantum chaos. The chaotic nature of a many-body quantum system is sensed by studying the implications that the system produces in the long-time dynamics of a probe coupled to it.
  arXiv  Detail & Related papers  (2021-04-13T17:24:08Z)
• Controlling many-body dynamics with driven quantum scars in Rydberg atom arrays [41.74498230885008]
  We experimentally investigate non-equilibrium dynamics following rapid quenches in a many-body system composed of 3 to 200 strongly interacting qubits in one and two spatial dimensions. We discover that scar revivals can be stabilized by periodic driving, which generates a robust subharmonic response akin to discrete time-crystalline order.
  arXiv  Detail & Related papers  (2020-12-22T19:00:02Z)
• Transmon platform for quantum computing challenged by chaotic fluctuations [55.41644538483948]
  We investigate the stability of a variant of a many-body localized (MBL) phase for system parameters relevant to current quantum processors. We find that these computing platforms are dangerously close to a phase of uncontrollable chaotic fluctuations.
  arXiv  Detail & Related papers  (2020-12-10T19:00:03Z)
• Non-equilibrium non-Markovian steady-states in open quantum many-body systems: Persistent oscillations in Heisenberg quantum spin chains [68.8204255655161]
  We investigate the effect of a non-Markovian, structured reservoir on an open Heisenberg spin chain. We establish a coherent self-feedback mechanism as the reservoir couples frequency-dependent to the spin chain.
  arXiv  Detail & Related papers  (2020-06-05T09:16:28Z)

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.