Classical Pendulum Feels Quantum Back-Action

Nobuyuki Matsumoto

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English

Springer Verlag, Japan
14 December 2015

Astronomical observation: observatories, equipment & methods; Low temperature physics; Quantum physics (quantum mechanics & quantum field theory); Astrophysics

Series: Springer Theses

In this thesis, ultimate sensitive measurement for weak force imposed on a suspended mirror is performed with the help of a laser and an optical cavity for the development of gravitational-wave detectors. According to the Heisenberg uncertainty principle, such measurements are subject to a fundamental noise called quantum noise, which arises from the quantum nature of a probe (light) and a measured object (mirror). One of the sources of quantum noise is the quantum back-action, which arises from the vacuum fluctuation of the light. It sways the mirror via the momentum transferred to the mirror upon its reflection for the measurement. The author discusses a fundamental trade-off between sensitivity and stability in the macroscopic system, and suggests using a triangular cavity that can avoid this trade-off. The development of an optical triangular cavity is described and its characterization of the optomechanical effect in the triangular cavity is demonstrated. As a result, for the first time in the world the quantum back-action imposed on the 5-mg suspended mirror is significantly evaluated. This work contributes to overcoming the standard quantum limit in the future.

By: Nobuyuki Matsumoto
Imprint: Springer Verlag, Japan
Country of Publication: Japan
Edition: 1st ed. 2016
Dimensions: Height: 235mm, Width: 155mm, Spine: 8mm
Weight: 454g
ISBN: 9784431558804
ISBN 10: 4431558802
Series: Springer Theses
Pages: 103
Publication Date: 14 December 2015
Audience: Professional and scholarly , Undergraduate
Format: Hardback
Publisher's Status: Active

Dr.Nobuyuki Matsumoto The university of Tokyo, Physics Department matsumoto@granite.phys.s.u-tokyo.ac.jp