Measurement-induced disturbance and thermal negativity in 1D optical lattice chain |
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Authors: | Jin-Liang Guo Lin-Wang Gui-Lu Long |
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Affiliation: | 1. State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China;2. College of Physics and Electronic Information Science, Tianjin Normal University, Tianjin 300387, China;3. Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing 100084, China |
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Abstract: | We study the measurement-induced disturbance (MID) in a 1D optical lattice chain with nonlinear coupling. Special attention is paid to the difference between the thermal entanglement and MID when considering the influences of the linear coupling constant, nonlinear coupling constant and external magnetic field. It is shown that MID is more robust than thermal entanglement against temperature T and external magnetic field B, and MID may reveal more properties about quantum correlations of the system, which can be seen from the point of view that MID can be nonzero when there is no thermal entanglement and MID can detect the critical point of quantum phase transition at finite temperature. |
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Keywords: | Quantum correlation Quantum entanglement Quantum discord Measurement-induced disturbance Spin chain |
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