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arXiv:quant-ph/0111137 · Springer eBooks

Information Transfer in Quantum Measurements: Irreversibility and Amplification

Wojciech Hubert Zurek

Published Jan 1, 1983• 22 citations
arXivHTMLPDF
DOI
10.1007/978-1-4613-3712-6_5

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Optics Express•Dec 8, 2024•1 citation
Irreversibility in quantum measurements is considered from the point of quantum information theory. For that purpose the information transfer between the measured object S and measuring system O is analyzed. It's found that due to the principal constraints of quantum-mechanical origin, the information about the purity of S state isn't transferred to O during the measurement of arbitraryS observable V. Consequently O can't discriminate the pure and mixed S ensembles with the same . As the result, the random outcomes should be detected by O in V measurement for S pure ensemble of V eigenstate superposition. It's shown that the outcome probabilties obey to Born rule. The influence of O decoherence by its environment is studied, however the account of its effects doesn't change these results principally.
A partially disembodied quantum state transfer (PDQST) machine is crucial for Gaussian quantum information processing. It integrates Gaussian quantum teleportation and Gaussian quantum cloning machines into a single quantum information platform and therefore enhances the multifunctionality and compatibility of the present quantum information system. However, the standard PDQST machine relies on infinite quantum squeezing, which is unachievable in the practical implementation. In this paper, we propose to use measurement-based noiseless linear amplification (MBNLA) to enhance the performance of the PDQST machine. By moving the standard PDQST machine to be non-deterministic, MBNLA reduces the need for infinite squeezing, enabling perfect quantum teleportation or asymmetric cloning with achievable squeezing levels. The feasibility of the MBNLA-based PDQST machine is analyzed by considering parameters such as noiseless gain and cutoff.