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Conservation laws, uncertainty relations, and quantum limits of measurements | Masanao Ozawa
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24 Dec 2001 | Journal: | Phys. Rev. Lett. 88, 050402(1--4) (2002). | Subject: | quant-ph | Affiliation: | Tohoku University | Abstract: | The uncertainty relation between the noise operator and the conserved quantity leads to a bound for the accuracy of general measurements. The bound extends the assertion by Wigner, Araki, and Yanase that conservation laws limit the accuracy of ``repeatable’’, or ``nondisturbing’’, measurements to general measurements, and improves the one previously obtained by Yanase for spin measurements. The bound also sets an obstacle to making a small quantum computer. | Source: | arXiv, quant-ph/0112154 | Other source: | [GID 1022960] pmid11863707 | Services: | Forum | Review | PDF | Favorites |
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