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Lecture notes in physics

Control of Cold Atomic Collisions by Multiparticle Entanglement and a Modified Vacuum in Cavity QED

J.I. Kim, R.B.B. Santos, P. Nussenzveig

Published Jan 1, 2001• 0 citations
Publisher
DOI
10.1007/3-540-45409-8_9

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Schemes are presented for realizing quantum controlled phase gate and preparing an N -qubit W -like state, which are based on the large-detuned interaction among three-state atoms, dual-mode cavity and a classical pulse. In particular, a class of W states that can be used for perfect teleportation and superdense coding is generated by only one step. Compared with the previous schemes, cavity decay is largely suppressed because the cavity is only virtually excited and always in the vacuum state and the atomic spontaneous emission is strongly restrained due to a large atom—field detuning.