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Physics - Classical Continuum Physics | Formulation of Uncertainty Relation Between Error and Disturbance in Quantum Measurement by Using Quantum Estimation Theory

Formulation of Uncertainty Relation Between Error and Disturbance in Quantum Measurement by Using Quantum Estimation Theory

Series: Springer Theses

Watanabe, Yu

2014, XIII, 122 p. 8 illus., 5 illus. in color.

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  • Formulates error and disturbance in quantum measurement in terms of Fisher information
  • Calculates the classical and quantum Fisher information using a Lie algebraic approach
  • Establishes in a groundbreaking work the fundamental bound on the accuracy of one measured observable and the disturbance on its conjugate one in the spirit of Heisenberg
  • Nominated as an outstanding contribution by the University of Tokyo's Physics Department in 2012

In this thesis, quantum estimation theory is applied to investigate uncertainty relations between error and disturbance in quantum measurement. The author argues that the best solution for clarifying the attainable bound of the error and disturbance is to invoke the estimation process from the measurement outcomes such as signals from a photodetector in a quantum optical system. The error and disturbance in terms of the Fisher information content have been successfully formulated and provide the upper bound of the accuracy of the estimation. Moreover, the attainable bound of the error and disturbance in quantum measurement has been derived.

The obtained bound is determined for the first time by the quantum fluctuations and correlation functions of the observables, which characterize the non-classical fluctuation of the observables. The result provides the upper bound of our knowledge obtained by quantum measurements.

The method developed in this thesis will be applied to a broad class of problems related to quantum measurement to build a next-generation clock standard and to successfully detect gravitational waves.

Content Level » Research

Keywords » Attainable Bound of Uncertainty Relation - Estimation Theory of Error and Disturbance - Heisenberg’s Uncertainty Relation - Information Theoretic Formulation of Error and Disturbance - Lie Algebra - Quantum Fisher Information - Quantum Measurement

Related subjects » Applied & Technical Physics - Classical Continuum Physics - Education & Language - Theoretical, Mathematical & Computational Physics

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