Mechanism of entanglement preservation

Journal Article · Sat May 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.052330· OSTI ID:21408804

Qingjun, Tong ^[1]; Junhong, An ^[1]; Honggang, Luo ^[1]; Oh, C H ^[2]

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1. Center for Interdisciplinary Studies, Lanzhou University, Lanzhou 730000 (China)
2. Department of Physics, National University of Singapore, 3 Science Drive 2, Singapore 117543 (Singapore)

We study the entanglement preservation of two qubits locally interacting with their reservoirs. We show that the existence of a bound state of the qubit and its reservoir and the non-Markovian effect are two essential ingredients and their interplay plays a crucial role in preserving the entanglement in the steady state. When the non-Markovian effect is neglected, the entanglement sudden death (ESD) is reproduced. On the other hand, when the non-Markovian is significantly strong but the bound state is absent, the phenomenon of the ESD and its revival is recovered. Our formulation presents a unified picture about the entanglement preservation and provides a clear clue on how to preserve the entanglement in quantum information processing.

• OSTI ID: 21408804
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOUND STATE
DATA PROCESSING
INFORMATION
MARKOV PROCESS
PRESERVATION
PROCESSING
QUANTUM ENTANGLEMENT
QUANTUM INFORMATION
QUBITS
STEADY-STATE CONDITIONS
STOCHASTIC PROCESSES