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Thermal effects on quantum communication through spin chains

Bayat, A ; Sharif University of Technology | 2005

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.71.042330
  3. Publisher: 2005
  4. Abstract:
  5. We study the effect of thermal fluctuations in a recently proposed protocol for transmission of unknown quantum states through quantum spin chains. We develop a low-temperature expansion for general spin chains. We then apply this formalism to study exactly thermal effects on short spin chains of four spins. We show that optimal times for extraction of output states are almost independent of the temperature, which lowers only the fidelity of the channel. Moreover we show that thermal effects are smaller in the antiferromagnetic chains than the ferromagnetic ones. © 2005 The American Physical Society
  6. Keywords:
  7. Low-temperature expansion ; Quantum states ; Antiferromagnetism ; Communication systems ; Thermal effects ; Quantum theory
  8. Source: Physical Review A - Atomic, Molecular, and Optical Physics ; Volume 71, Issue 4 , 2005 ; 10502947 (ISSN)
  9. URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.71.042330