Dynamics of Quantum Discord of Two-Qubit Coupled with a Vacuum Cavity
| Autor: | Jian-Xing Fang, Zhan-Ying Guo, Rui-Hua Xiao, Shiqun Zhu |
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| Rok vydání: | 2012 |
| Předmět: |
Quantum phase transition
Physics Quantum discord Physics and Astronomy (miscellaneous) Quantitative Biology::Tissues and Organs General Mathematics technology industry and agriculture Cavity quantum electrodynamics Quantum Physics Quantum entanglement equipment and supplies Quantitative Biology::Genomics Quantitative Biology::Quantitative Methods Quantum process Quantum electrodynamics Quantum mechanics Qubit Quantum system Quantitative Biology::Populations and Evolution Amplitude damping channel |
| Zdroj: | International Journal of Theoretical Physics. 52:1721-1728 |
| ISSN: | 1572-9575 0020-7748 |
| DOI: | 10.1007/s10773-012-1140-8 |
| Popis: | The dynamical behaviors of quantum discord between two atoms coupled with a vacuum cavity are investigated. If the two qubits are initially prepared in two extended Werner-like states, the quantum discord and entanglement can be numerically calculated. There are remarkable differences between the time evolutions of the quantum discord and entanglement under the same conditions. These results imply that quantum discord is not zero for some unentangled states and in some regions entanglement can disappear completely. A large amount of quantum discord exists between the two-qubit. Thus, the quantum discord is more robust than entanglement for the quantum system exposed to the environment. The quantum discord shows sudden change and its existence depends on the initial state of the system. This property of quantum discord may have important implications for experimental characterization of quantum phase transitions. |
| Databáze: | OpenAIRE |
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