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AIP Advances

Magnetic field optimization for long-lived entanglement in quantum spin systems

Jin Wang, Julie Krause

Published Mar 1, 2025• 0 citations
Publisher

Abstract

This work proposes a method for stabilizing entanglement in Heisenberg spin dimers by optimizing time-varying magnetic fields. Unlike traditional approaches that rely on static configurations, the method adapts the magnetic field in real-time using simulated annealing, addressing oscillatory degradation of entanglement. This dynamic control approach aims to extend coherence times and improve the stability of high-concurrence states, offering a potentially more robust solution for quantum communication and computation. The approach complements existing findings by focusing on the longevity and coherence of entanglement, rather than its generation or distribution, providing an alternative to conventional fixed-field methods and contributing to the ongoing efforts to enhance entanglement stability in quantum systems.

DOI
10.1063/9.0000866

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A method for stabilizing oscillations and maximizing entanglement in a decoherence free Heisenberg spin dimer using a time varying magnetic field is presented. Unentangled and fully entangled initial states are investigated. A stabilizing magnetic field intensity function was found for both initial states. These time varying magnetic field intensity functions are different from each other, implying that the magnetic intensity variation needed to stabilize the system depends on the initial state. The time varying magnetic field functions were found using simulated annealing optimization. This work proves that it is possible to remove the oscillatory nature of entanglement and maximize entanglement in decoherence free systems.
Genetic algorithm optimized time varying magnetic field functions for stabilizing and maximizing entanglement in a decoherence-free Heisenberg spin dimer are presented. The oscillation in entanglement in a decoherence free magnetic spin dimer is presented. The effect on the coherence and population terms in the density matrix due to the time-varying magnetic field functions is discussed and viewed using two dimensional time varying plots of entanglement and three-dimensional Bloch sphere diagrams. This work shows that it is possible to remove the natural oscillatory nature of decoherence free entanglement and maximize entanglement using time varying transient magnetic field stabilizing functions.
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