Generation of maximum spin entanglement induced by cavity field in quantum-dot systems

Details Generation of maximum spin entanglement induced by cavity field in quantum-dot systems Generation of maximum spin entanglement induced by cavity field in quantum-dot systems

2002-05-07

arxiv.org/abs/quant-ph/0205030v2

Phys. Rev. A 65, 062321 (2002)

Physics

Quantum Physics

6 pages, 7 figures, to appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.65.062321

Equivalent-neighbor interactions of the conduction-band electron spins of quantum dots in the model of Imamoglu et al. [Phys. Rev. Lett. 83, 4204 (1999)] are analyzed. Analytical solution and its Schmidt decomposition are found and applied to evaluate how much the initially excited dots can be entangled to the remaining dots if all of them are initially disentangled. It is demonstrated that the perfect maximally entangled states (MES) can only be generated in the systems of up to 6 dots with a single dot initially excited. It is also shown that highly entangled states, approximating the MES with a good accuracy, can still be generated in systems of odd number of dots with almost half of them being excited. A sudden decrease of entanglement is observed by increasing the total number of dots in a system with a fixed number of excitations.

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