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Classicalization of quantum state of detector by amplification process

Tirandaz, A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.physleta.2019.02.039
  3. Publisher: Elsevier B.V , 2019
  4. Abstract:
  5. It has been shown that a macroscopic system being in a high-temperature thermal coherent state can be, in principle, driven into a non-classical state by coupling to a microscopic system. Therefore, thermal coherent states do not truly represent the classical limit of quantum description. Here, we study the classical limit of quantum state of a more relevant macroscopic system, namely the pointer of a detector, after the phase-preserving linear amplification process. In particular, we examine to what extent it is possible to find the corresponding amplified state in a superposition state, by coupling the pointer to a qubit system. We demonstrate quantitatively that the amplification process is able to produce the classical limit of quantum state of the pointer, offering a route for a classical state in a sense of not to be projected into a quantum superposition state. © 2019 Elsevier B.V
  6. Keywords:
  7. Amplification process ; Open quantum systems ; Quantum to classical transition
  8. Source: Physics Letters, Section A: General, Atomic and Solid State Physics ; Volume 383, Issue 15 , 2019 , Pages 1677-1682 ; 03759601 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0375960119301860