Geodesic
Nondigital Implementation of the Arithmetic of Real Numbers
Matematičeskie zametki, Tome 70 (2001) no. 1, pp. 59-67.

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In the framework of a model for quantum computer media, a nondigital implementation of the arithmetic of the real numbers is described. For this model, an elementary storage “cell” is an ensemble of qubits (quantum bits). It is found that to store an arbitrary real number it is sufficient to use four of these ensembles and the arithmetical operations can be implemented by fixed quantum circuits. 
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G. L. Litvinov; V. P. Maslov; G. B. Shpiz. Nondigital Implementation of the Arithmetic of Real Numbers. Matematičeskie zametki, Tome 70 (2001) no. 1, pp. 59-67. http://geodesic.mathdoc.fr/item/MZM_2001_70_1_a7/

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