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Quantum noise can enhance algorithmic cooling

Farahmand, Z ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.105.022418
  3. Publisher: American Physical Society , 2022
  4. Abstract:
  5. Heat-bath algorithmic cooling (HBAC) techniques are techniques that are used to purify a target element in a quantum system. These methods compress and transfer entropy away from the target element into auxiliary elements of the system. The performance of algorithmic cooling has been investigated under ideal noiseless conditions. However, realistic implementations are imperfect, and for practical purposes, noise should be taken into account. Here we analyze HBAC techniques under realistic noise models. Surprisingly, we find that noise can, in some cases, enhance the performance and improve the cooling limit of HBAC techniques. We numerically simulate the noisy algorithmic cooling for the two optimal strategies, partner-pairing and two-sort algorithms. We find that for both of them, in the presence of the generalized amplitude damping noise, the process converges, and the asymptotic purity can be higher than the noiseless process. This opens up new avenues for increasing the purity beyond heat-bath algorithmic cooling. © 2022 American Physical Society
  6. Keywords:
  7. Quantum noise ; Quantum optics ; Algorithmics ; Condition ; Cooling technique ; Heat-bath algorithmic cooling ; Noise models ; Optimal strategies ; Performance ; Quantum system ; Target element ; Transfer entropy ; Cooling
  8. Source: Physical Review A ; Volume 105, Issue 2 , 2022 ; 24699926 (ISSN)
  9. URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.105.022418