scispace - formally typeset
Search or ask a question

Showing papers on "Quantum error correction published in 1979"


Journal ArticleDOI
TL;DR: In this article, the authors re-examine the notion of the quantum potential introduced by the Broglie and Bohm and calculate its explicit form in the case of the two-slit interference experiment.
Abstract: We re-examine the notion of the quantum potential introduced by the Broglie and Bohm and calculate its explicit form in the case of the two-slit interference experiment. We also calculate the ensemble of particle trajectories through the two slits. The results show clearly how the quantum potential produces the bunching of trajectories that is required to obtain the usual fringe intensity pattern. Hence we are able to account for the interference fringes while retaining the notion of a well-defined particle trajectory. The wider implications of the quantum potential particularly in regard to the quantum interconnectedness are discussed.

317 citations


Journal ArticleDOI
TL;DR: In this paper, a variety of quantum nondemolition measurement schemes are defined and examples are given to demonstrate their theoretical and practical possibilities, and it is shown that the quantum limit of measurement of weak forces does not exist.
Abstract: A variety of quantum nondemolition measurement schemes are defined and examples are given to demonstrate their theoretical and practical possibilities. They show that the quantum limit of measurement of weak forces does not exist.

72 citations


Journal ArticleDOI
TL;DR: Methods are presented for calculating the minimum attainable probability of error in detecting a coherent quantum signal received amid thermal noise in the limits of low and high signal-to-noise ratio.
Abstract: Methods are presented for calculating the minimum attainable probability of error in detecting a coherent quantum signal received amid thermal noise in the limits of Iow and high signal-to-noise ratio. In the latter limit, quantum-mechanical perturbation theory is applied to solving the detection operator equation approximately. Graphical results are furnished for binary signals transmitted with equal prior probabilities. Previous work on this problem is thus extended to a broader range of signal and noise strengths. The results are applied to the detection of antipodal two-photon-coherent-state signals.

4 citations