Abstract
Entanglement sudden death and revival of entanglement are generic features of the evolution of entangled quantum systems interacting with a thermal reservoir. We investigated the evolution of mixed entangled states of different ranks of two spatially separated qubits interacting through dipole forces and in contact with a common finite temperature photon bath. For a fixed initial concurrence, lower rank initial states exhibit ESD at later times. ESD time increases with increase in initial concurrence for a given mean number of photons, N in a bath. Further, ESD time decreases with increase in N. The choice of low rank mixed state with higher entanglement and low N of the bath can delay or even avoid ESD.
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Namitha C V acknowledges DST for the financial support (No. DST/INSPIRE Fellowship/2013/974) under the scheme of AORC-INSPIRE Fellowship.
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Namitha, C.V., Paulson, K.G. & Satyanarayana, S.V.M. Rank dependence of entanglement sudden death of a two-qubit system in a thermal reservoir. J Opt 48, 474–478 (2019). https://doi.org/10.1007/s12596-019-00563-9
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DOI: https://doi.org/10.1007/s12596-019-00563-9