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Decoherence due to gravity: Open quantum system approach. : 중력에 의한 결잃음: 열린 양자계 관점으로.

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Authors

한정연

Advisor
이상민
Major
자연과학대학 물리·천문학부
Issue Date
2018-02
Publisher
서울대학교 대학원
Keywords
GravityDecoherenceRelativistic quantum information
Description
학위논문 (석사)-- 서울대학교 대학원 : 자연과학대학 물리·천문학부, 2018. 2. 이상민.
Abstract
This thesis addresses various sources of fluctuation and discusses how quantum states are affected by these fluctuations based on the semi-classical gravity theory, especially in relation to the macroscopic quantum state.
First, due to the time dilation effect of gravity, decoherence with respect to the proper time basis can arise. By taking a different approach from that taken in previous work (Zych et al.), we analyze the case of a constant-acceleration field using the concept of Rindler space-time. Furthermore, given that proper acceleration is proportional to the Unruh temperature, we link it to an experimental proposal of decoherence using the fluctuations in the Unruh temperature.
Secondly, in a macroscopic system, the self-localization effect toward the position of the center of mass arises due to fluctuations in the interaction potential. This leads to decoherence with regard to the position basis (the Diósi-Penrose Model). Furthermore, when considering gravity as a classical channel with noise, localization can also be explained by a weak measurement of each mass (the Kafri-Taylor-Milburn Model).
Finally, we checked the decoherence effect not merely by examining the quantum characteristics, as is usually done, but with classical fluctuation in the metric field stemming from the dynamics of the field source. In fact, due to the dominance of classical fluctuation, we attempt to analyze this from another perspective. Specifically (In particular), the energy scale between the gravitational wave which represents the classical field and graviton which indicates the quantum field is nearly 3 ∗ 10^37. Hence, the leading effect of gravitational decoherence is followed by fluctuation of the gravitational wave. Furthering this analogy, we obtain additional data pertaining to the kernel in terms of Newtonian interaction in the DP model from the fluctuation in the classical field and clarify what this solution indicates.
Language
English
URI
https://hdl.handle.net/10371/142428
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