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International Conference on Quantum Information

QUANTUM MEASUREMENTS OF ATOMS USING CAVITY QED

Adetunmise C. Dada, Erika Andersson, Martin L. Jones, Viv M. Kendon, Mark S. Everitt

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We propose schemes to realize two non-standard quantum measurements using cavity quantum electrodynamics (QED). Such measurements have only been realized on photons, and realizations using atoms could be more easily scaled than existing realizations using photons.
DOI
10.1364/icqi.2011.qmi7

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Recent experimental advances in the field of cavity quantum electrodynamics (QED) have opened new possibilities for control of atom‐photon interactions. A laser with “one and the same atom” demonstrates the theory of laser operation pressed to its conceptual limit. The generation of single photons on demand and the realization of cavity QED with well defined atomic numbers N = 0, 1, 2,… both represent important steps toward realizing diverse protocols in quantum information science. Coherent manipulation of the atomic state via Raman transitions provides a new tool in cavity QED for in situ monitoring and control of the atom‐cavity system. All of these achievements share a common point of departure: the regime of strong coupling. It is thus interesting to consider briefly the history of the strong coupling criterion in cavity QED and to trace out the path that research has taken in the pursuit of this goal.
An experimentally feasible new scheme for quantum secure direct communication is proposed in cavity quantum electrodynamics without apparent joint Bell-state measurement. The legitimate user can receive different secret messages in a direct way through Einstein–Podolsky–Rosen (EPR) pairs, the probability of the success in our scheme is unity. In the communication processes, the interactions between atoms and a single-mode non-resonant cavity with the assistance of a strong classical driving field substitute the joint measurements. Hence, this scheme needs only separate measurements. In addition, the scheme is insensitive to the cavity decay and the thermal field. The discussion of the scheme indicates that it can be realized based on current technologies.