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arXiv:quant-ph/0109144 · Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Maximum entanglement of quantum-dot systems with single excitation in the spin van der Waals model

Adam Miranowicz, Şahin Kaya Özdemir, Masato Koashi, N. Imoto, Y. Hirayama

Published Nov 13, 2002• 0 citations
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Abstract

Time evolution of entanglement of N quantum dots are analyzed within the spin-1/2 van der Waals (or Lipkin-Meshkov-Glick) XY model. It is shown that, for a single dot initially excited and disentangled from the remaining unexcited dots, the maximum bipartite entanglement can be obtained in the systems of N=2, /spl middot//spl middot//spl middot/, 6 dots only.

DOI
10.1109/cleopr.2001.970843

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Time evolution of entanglement of N quantum dots are analyzed within the spin-1/2 van der Waals (or Lipkin-Meshkov-Glick) XY model. It is shown that, for a single dot initially excited and disentangled from the remaining unexcited dots, the maximum bipartite entanglement can be obtained in the systems of N=2, /spl middot//spl middot//spl middot/, 6 dots only.
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We report a study on coherence of excitation of single quantum dots. We address the coherent excitation of biexcitons, the process that is indispensable for deterministic photon pair generation in quantum dots. Based on theoretical modeling we optimized the duration of the excitation pulse in our experiment to minimize the laser-induced dephasing and increase the biexciton-to-background single-exciton occupation probability. An additional effect of this approach is a high degree of time-bin entanglement with a concurrence of up to 0.78(6) and a 0.88(3) overlap with a maximally entangled state.
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Abstract We assess the thermal resilience of key quantum resources-( ℓ 1 {\ell }_{1} )-norm coherence ( Q Q ), quantum discord ( D D ), logarithmic negativity ( ℒN {\mathcal{ {\mathcal L} N}} ), Bell nonlocality ( ℬ {\mathcal{ {\mathcal B} }} ), and quantum steering ( S {\mathcal{S}} )-in a bipartite Lipkin–Meshkov–Glick (LMG) spin system subject to competing Dzyaloshinskii–Moriya (DM) interactions and Zeeman splitting. By varying temperature ( T T ), spin–spin coupling ( λ \lambda ), magnetic field strength ( B 0 {B}_{0} ), and DM amplitude ( D z {D}_{z} ), we reveal a clear hierarchy of thermal stability: coherence and discord remain robust well beyond the temperatures at which nonlocality ( ℬ {\mathcal{ {\mathcal B} }} ), steering ( S {\mathcal{S}} ), and bipartite entanglement ( ℒN {\mathcal{ {\mathcal L} N}} ) undergo successive thermal collapse. Stronger spin–spin c
The generation of entanglement between two identical, interacting quantum dots---initially in ground states---by a coherent field and the subsequent time evolution of the entanglement are studied by calculating the concurrence between the two dots. The results predict that while it is possible to generate entanglement (or entanglement of formation, as defined for a mixed state) between the two dots, at no time do the dots become fully entangled to each other or is a maximally entangled Bell state ever achieved. We also observe that the degree of entanglement increases with an increase in the photon number inside the cavity and a decrease in the dot-photon coupling. The behavior of the two-dot system, initially prepared in an entangled state and interacting with thermal light, is also studied.