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A Study of Laboratory Proposals for Detecting Gravitational Entanglement in Quantum Interferometry

Najafzadeh, Ayda | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58620 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Khosravi, Nima; Karimipour, Vahid
  7. Abstract:
  8. In recent years, growing attention has been directed toward the possibility of testing the quantum nature of gravity using laboratory-scale systems; a pursuit motivated by the fundamental question of whether the gravitational field, like the other fundamental interactions, possesses quantum degrees of freedom or can be fully described by a classical theory. In this thesis, we begin by reviewing the principles of quantum interference and the role of path-dependent phase in experiments such as atomic interferometry and the gravitational Aharonov–Bohm effect, illustrating how these techniques enable the detection of extremely weak gravitational influences. We then introduce quantum entanglement as a diagnostic tool for assessing the quantum character of physical interactions, and we analyze recent proposals in which two spatially superposed masses become entangled solely through their mutual gravitational interaction. The potential observation of such entanglement is discussed as an indirect signature of the quantization of the gravitational field. In the final part, quantized linear gravity is employed to describe the gravitational Aharonov–Bohm effect and to estimate the entanglement generated between a particle and the gravitational field. The results of this study highlight that the combination of high-precision interferometry and entanglement-based quantification methods may offer a promising route toward experimentally probing quantum aspects of gravity in the near future
  9. Keywords:
  10. Quantum Gravity ; Quantum Entanglement ; General Relativity Theory ; Linearized Gravity ; Aharanov-Bohm Effect ; Atomic Interferometry

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