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Paper   IPM / Physic / 14941
School of Physics
  Title:   Classicalization of Quantum State of Detector by Amplification Process
1.  A. Tirandaz
2.  F. Taher Ghahramani
3.  A. Asadian
4.  M. Golshani
  Status:   Published
  Journal: Phys. Lett. A
  Vol.:  383
  Year:  2019
  Pages:   1677-1682
  Supported by:  IPM
It has been shown that a macroscopic quantum system being in a high-temperature thermal coherent state can, in principle, be driven into non-classical states by coupling it to a microscopic quantum system. Therefore, thermal coherent states do not truly represent a purely classical system such as a measurement apparatus. Here, we investigate the classical limit of the quantum description of a more relevant macroscopic quantum system, namely a phase-preserving linear amplifier. In particular, we examine to what extent it is possible to find an amplified coherent state, supposedly representing the pointer state of a detector, in a superposition state, by coupling it to a qubit system. We demonstrate quantitatively that the classicalization induced by a realistic amplifier might not be isomorphic to that of a high-temperature thermal coherent state, offering a route to a classical state in a sense of not being able to be projected into a macroscopically distinct superposed state.

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