Elements of Quantum Information by Wolfgang P. Schleich, Herbert Walther PDF

By Wolfgang P. Schleich, Herbert Walther

'Elements of Quantum details' introduces the reader to the interesting box of quantum details processing, which lives at the interface among computing device technological know-how, physics, arithmetic, and engineering. This interdisciplinary department of technological know-how flourishes at the use of quantum mechanics as a source for top strength glossy purposes. With its vast assurance of experiments, purposes, and really expert subject matters - all written through popular specialists - 'Elements of Quantum details' presents an critical up to date account of the cutting-edge of this swiftly advancing box and takes the reader instantly as much as the frontiers of present study. The articles have first seemed as a unique factor of the magazine 'Fortschritte der Physik/Progress of Physics'. because then, they've been rigorously up to date. The ebook could be an inspiring resource of data and perception for an individual discovering and focusing on experiments and idea of quantum details.

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As the atoms are the source of the field, the field statistics can be related to the atomic statistics in a systematic manner [35]. The observation of sub-Poissonian atomic statistics was reported by Rempe, Schmidt-Kaler and Walther [36], and its relation to the sub-Poissonian photon distribution was first studied by Rempe and Walther [37] and later by Briegel et al. [35]. The reason for the sub-Poissonian atomic statistics is as follows: A changing flux of atoms changes the Rabi frequency via the stored photon number in the cavity.

This means that when, for example, two atoms in the upper state enter the cavity close to each other, the second one performs a transition to the lower state with reduced probability. The interaction with the cavity field thus leads to an atomic beam with atoms in the lower maser level showing number fluctuations which are up to 40 % below those of a Poissonian distribution usually found in atomic beams. This is interesting because atoms in the lower level have emitted a photon to compensate for cavity losses inevitably present.

The oscillation undergoes collapse due to the dispersion of the Rabi frequencies. This effect is unitary and reversible.

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