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Uncertainty Relations for Noise and Disturbance in Generalized Quantum Measurements

机译:广义量子测量中噪声和干扰的不确定性关系

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摘要

Heisenberg's uncertainty relation for measurement noise and disturbance states that any position measurement with noise epsilon brings the momentum disturbance not less than hbar/2epsilon. This relation holds only for restricted class of measuring apparatuses. Here, Heisenberg's uncertainty relation is generalized to a relation that holds for all the possible quantum measurements, from which conditions are obtained for measuring apparatuses to satisfy Heisenberg's relation. In particular, every apparatus with the noise and the disturbance statistically independent from the measured object is proven to satisfy Heisenberg's relation. For this purpose, all the possible quantum measurements are characterized by naturally acceptable axioms. Then, a mathematical notion of the distance between probability operator valued measures and observables is introduced and the basic properties are explored. Based on this notion, the measurement noise and disturbance are naturally defined for any quantum measurements in a model independent formulation. Under this formulation, various uncertainty relations are also derived for apparatuses with independent noise, independent disturbance, unbiased noise, and unbiased disturbance as well as noiseless apparatuses and nondisturbing apparatuses. Two models of position measurements are discussed to show that Heisenberg's relation can be violated even by approximately repeatable position measurements.
机译:海森堡对于测量噪声和扰动的不确定性关系表明,任何带有噪声ε的位置测量都会带来动量扰动不小于hbar / 2epsilon。该关系仅适用于受限的测量设备类别。在这里,海森堡的不确定性关系被概括为对所有可能的量子测量都成立的关系,从该关系中获得了使测量设备满足海森堡关系的条件。尤其是,每个噪声和干扰在统计上独立于被测对象的设备都被证明满足海森堡的关系。为此,所有可能的量子测量均以自然可接受的公理为特征。然后,介绍了概率算子值度量与可观测值之间距离的数学概念,并探讨了基本属性。基于此概念,自然而然地在模型无关的公式中为任何量子测量定义了测量噪声和干扰。根据该公式,对于具有独立噪声,独立干扰,无偏噪声和无偏干扰的设备以及无噪声设备和无干扰设备,还导出了各种不确定性关系。讨论了两种位置测量模型,以表明即使通过近似可重复的位置测量也可以违反海森堡的关系。

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  • 作者

    Ozawa, M;

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  • 年度 2003
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  • 原文格式 PDF
  • 正文语种 eng
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