Rank dependence of entanglement sudden death of a two-qubit system in a thermal reservoir

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 force...

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Bibliographic Details
Published inJournal of optics (New Delhi) Vol. 48; no. 4; pp. 474 - 478
Main Authors Namitha, C. V., Paulson, K. G., Satyanarayana, S. V. M.
Format Journal Article
LanguageEnglish
Published New Delhi Springer India 01.12.2019
Springer Nature B.V
Subjects
Dependence
Dipoles
Entangled states
Evolution
Lasers
Optical Devices
Optics
Photonics
Photons
Physics
Physics and Astronomy
Quantum entanglement
Qubits (quantum computing)
Research Article
Reservoirs
Decoherence
Markovian process
Quantum entanglement
Thermal reservoir
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Summary: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.
ISSN:0972-8821
0974-6900
DOI:10.1007/s12596-019-00563-9