Ultrafast deterministic generation of entanglement in a time-dependent asymmetric two-qubit-cavity system

Details Ultrafast deterministic generation of entanglement in a time-dependent asymmetric two-qubit-cavity system Ultrafast deterministic generation of entanglement in a time-dependent asymmetric two-qubit-cavity system

2003-11-17

arxiv.org/abs/quant-ph/0311111v1

Phys. Rev A 70 020301(R) (2004)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.70.020301

We present an efficient scheme for the controlled generation of pure two-qubit states possessing {\em any} desired degree of entanglement and a {\em prescribed} symmetry in two cavity QED based systems, namely, cold trapped ions and flying atoms. This is achieved via on-resonance ion/atom-cavity couplings which are time-dependent and asymmetric, leading to a trapping vacuum state condition which does not arise for identical couplings. A duality in the role of the coupling ratio yields states with a given concurrence but opposing symmetries. The experimental feasibility of the proposed scheme is also discussed.

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