2017/07/04 by Xue-Min Bai, Chunping Gao, Chun-Ping Gao +5
Computer Science · Physics and Astronomy · #Coherence (philosophical gambling strategy) #Concurrence #Photon #Physics #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum Zeno effect #Quantum correlation #Quantum decoherence #Quantum discord #Quantum entanglement #Quantum mechanics #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.1364/oe.25.017051
15 pages, 4 figures
arxiv created 2017/07/04 · openalex publication_date 2017/07/10 · arxiv updated 2017/08/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We in this paper study quantum correlations for two neutral spin-particles coupled with a single-mode optical cavity through the usual magnetic interaction. Two-spin entangled states for both antiparallel and parallel spin-polarizations are generated under the photon coherent-state assumption. Based on the quantum master equation we derive the time-dependent quantum correlation of Clauser-Horne-Shimony-Holt (CHSH) type explicitly in comparison with the well known entanglement-measure concurrence. In the two-spin singlet state, which is recognized as one eigenstate of the system, the CHSH correlation and concurrence remain in their maximum values invariant with time and independent of the average photon-numbers either. The correlation varies periodically with time in the general entangled-states for the low average photon-numbers. When the photon number increases to a certain value the oscillation becomes random and the correlations are suppressed below the Bell bound indicating the decoherence of the entangled states. In the high photon-number limit the coherence revivals periodically such that the CHSH correlation approaches the upper bound value at particular time points associated with the cavity-field period.