F Bodoky et al 2009 J. Phys.: Condens. Matter 21 395602 doi:10.1088/0953-8984/21/39/395602
F Bodoky1, O Gühne2,3 and M Blaauboer1
Show affiliationsWe investigate the time evolution of entanglement under various models of decoherence: a general heuristic model based on local relaxation and dephasing times, and two microscopic models describing decoherence of electron spin qubits in quantum dots due to the hyperfine interaction with the nuclei. For each of the decoherence models, we investigate and compare how long the entanglement can be detected. We also introduce filtered witness operators, which extend the available detection time and investigate this detection time for various multipartite entangled states. By comparing the time required for detection with the time required for generation and manipulation of entanglement, we estimate for a range of different entangled states how many qubits can be entangled in a one-dimensional array of electron spin qubits.
03.65.Yz Decoherence; open systems; quantum statistical methods
03.67.Lx Quantum computation architectures and implementations
03.65.Db Functional analytical methods
Issue 39 (30 September 2009)
Received 21 April 2009, in final form 1 July 2009
Published 1 September 2009
F Bodoky et al 2009 J. Phys.: Condens. Matter 21 395602
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