Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:1809.09372 · Physics Letters A

Robust entanglement transfer through a disordered qubit ladder

G. M. A. Almeida, André M. C. Souza, F. A. B. F. de Moura, M. L. Lyra

Published Jul 22, 2019• 12 citations
arXivHTMLPDF
DOI
10.1016/j.physleta.2019.125847

Related papers

Robust and efficient transport of two-qubit entanglement via disordered spin chains

Rafael Vieira, Gustavo Rigolin

arXiv:1903.11419•Quantum Information Processing•Mar 23, 2019•11 citations

Superconducting Qubits for Robust Remote Entanglement via Adiabatic State Transfer

Hung-Shen Chang, Youpeng Zhong, Audrey Bienfait +8 more

Bulletin of the American Physical Society•Mar 3, 2020•0 citations

Robustness of tripartite entanglement transfer from bosonic modes to localized qubits

ALFREDO LULLI, Matteo Bina, Marco G. Genoni

The European Physical Journal Special Topics•Apr 1, 2012•1 citation

Entanglement Transfer Dynamics in a Two-Leg Spin Ladder Under a Selective Magnetic Field

Soghra Ghanavat, Abbas Sabour, Somayeh Mehrabankar

We investigate the dynamical transfer of bipartite entanglement through a two-leg spin-1/2 ladder governed by the anisotropic Heisenberg (XXZ-type) model with a selective magnetic field applied exclusively to the mediating rungs. Starting from a maximally entangled initial rung pair, we demonstrate high-fidelity entanglement transfer to the terminal pair (F_max = 0.9998 for N = 3 rung pairs), with the intermediate rungs remaining effectively disentangled throughout. The dynamics is governed by two independent timescales: a fast carrier oscillation at frequency omega_fast = 2*sqrt(1 + 4d^2) J (set by local rung physics, field-independent) and a slow transfer envelope with period T_slow = 2.37 h/J^2 (set by virtual inter-rung coupling, field-dependent). The effective inter-rung coupling J_eff = alpha(d,g) J^2/h is derived via second-order perturbation theory through two parallel virtual paths. We systematically study the effects of magnetic field strength, Hamiltonian anisotropy, and initial state on transfer quality, establish a global parameter space map of the fidelity, and demonstrate robustness under uncorrelated coupling disorder (mean F_max > 0.998 for delta <= 10%). All results are obtained by exact diagonalisation for systems of up to N = 5 rung pairs; extension to larger systems requires tensor-network methods such as DMRG. Compared to one-dimensional chain proposals, the ladder geometry enables a spatially selective control mechanism that suppresses intermediate entanglement while preserving coherent transfer, providing a distinct route to engineered quantum channels.

quant-pharXiv:2603.27511•Mar 31, 2026•0 citations

Information transfer in open quantum systems

E. K. Levi

This thesis covers open quantum systems and information transfer in the face of \ndissipation and disorder through numerical simulation. \nIn Chapter 3 we present work on an open quantum system comprising a two-level system, single bosonic mode and dissipative environment; we have included \nthe bosonic mode in the exact system treatment. This model allows us to gain an understanding of an environment’s role in small energy transfer systems. We observe \nhow the two-level system-mode coupling strength and the spectral density form characterising the environment interplay, affecting the system’s coherent behaviour. We \nfind strong coupling and a spectral density resonantly peaked on the two-level system oscillation frequency enhances the system’s coherent oscillatory dynamics. \nChapter 4 focusses on a physically motivated study of chain and ladder spin \ngeometries and their use for entanglement transfer between qubits. We consider a \nnitrogen vacancy centre qubit implementation with nitrogen impurity spin-channels \nand demonstrate how matrix product operator techniques can be used in simulations \nof this physical system. We investigate coupling parameters and environmental decay \nrates with respect to transfer efficiency effects. Then, in turn, we simulate the effects \nof missing channel spins and disorder in the spin-spin coupling. We conclude by \nhighlighting where our considered channel geometries outperform each other. \nThe work in Chapter 5 is an investigation into the feasibility of routing entanglement between distant qubits in 2D spin networks. We no longer consider a physical \nimplementation, but keep in mind the effects of dissipative environments on entanglement transfer systems. Starting with a single sending qubit-ancilla and multiple \naddressable receivers, we show it is possible to target a specific receiver and establish transferred entanglement between it and the sender’s ancilla through eigenstate tunnelling techniques. We proceed to show that eigenstate tunnelling-mediated entanglement transfer can be achieved simultaneously from two senders across one spin network.

•Jun 21, 2017•0 citations

Robust methods for entanglement distribution and their application to quantum communication

Philipp Sohr

•Jul 1, 2026•0 citations
We investigate the dynamical transfer of bipartite entanglement through a two-leg spin-1/2 ladder governed by the anisotropic Heisenberg (XXZ-type) model with a selective magnetic field applied exclusively to the mediating rungs. Starting from a maximally entangled initial rung pair, we demonstrate high-fidelity entanglement transfer to the terminal pair (F_max = 0.9998 for N = 3 rung pairs), with the intermediate rungs remaining effectively disentangled throughout. The dynamics is governed by two independent timescales: a fast carrier oscillation at frequency omega_fast = 2*sqrt(1 + 4d^2) J (set by local rung physics, field-independent) and a slow transfer envelope with period T_slow = 2.37 h/J^2 (set by virtual inter-rung coupling, field-dependent). The effective inter-rung coupling J_eff = alpha(d,g) J^2/h is derived via second-order perturbation theory through two parallel virtual paths. We systematically study the effects of magnetic field strength, Hamiltonian anisotropy, and initial state on transfer quality, establish a global parameter space map of the fidelity, and demonstrate robustness under uncorrelated coupling disorder (mean F_max > 0.998 for delta <= 10%). All results are obtained by exact diagonalisation for systems of up to N = 5 rung pairs; extension to larger systems requires tensor-network methods such as DMRG. Compared to one-dimensional chain proposals, the ladder geometry enables a spatially selective control mechanism that suppresses intermediate entanglement while preserving coherent transfer, providing a distinct route to engineered quantum channels.
This thesis covers open quantum systems and information transfer in the face of \ndissipation and disorder through numerical simulation. \nIn Chapter 3 we present work on an open quantum system comprising a two-level system, single bosonic mode and dissipative environment; we have included \nthe bosonic mode in the exact system treatment. This model allows us to gain an understanding of an environment’s role in small energy transfer systems. We observe \nhow the two-level system-mode coupling strength and the spectral density form characterising the environment interplay, affecting the system’s coherent behaviour. We \nfind strong coupling and a spectral density resonantly peaked on the two-level system oscillation frequency enhances the system’s coherent oscillatory dynamics. \nChapter 4 focusses on a physically motivated study of chain and ladder spin \ngeometries and their use for entanglement transfer between qubits. We consider a \nnitrogen vacancy centre qubit implementation with nitrogen impurity spin-channels \nand demonstrate how matrix product operator techniques can be used in simulations \nof this physical system. We investigate coupling parameters and environmental decay \nrates with respect to transfer efficiency effects. Then, in turn, we simulate the effects \nof missing channel spins and disorder in the spin-spin coupling. We conclude by \nhighlighting where our considered channel geometries outperform each other. \nThe work in Chapter 5 is an investigation into the feasibility of routing entanglement between distant qubits in 2D spin networks. We no longer consider a physical \nimplementation, but keep in mind the effects of dissipative environments on entanglement transfer systems. Starting with a single sending qubit-ancilla and multiple \naddressable receivers, we show it is possible to target a specific receiver and establish transferred entanglement between it and the sender’s ancilla through eigenstate tunnelling techniques. We proceed to show that eigenstate tunnelling-mediated entanglement transfer can be achieved simultaneously from two senders across one spin network.