2011/11/03 by Da-Wei Luo, Hai‐Qing Lin, Hai-Qing Lin +4
Chemistry · Computer Science · Physics and Astronomy · #Chemistry #Neural Networks and Reservoir Computing #Phase transition #Physics #Pulse (music) #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum computer #Quantum decoherence #Quantum mechanics #Quantum phase transition #Qubit #Spin (aerodynamics) #Statistical physics #Thermodynamics #Transition (genetics) #quant-ph
paper · pdf · doi:10.1103/physreva.84.062112
published as Phys. Rev. A 84, 062112 (2011) · 5 pages, 6 figures
arxiv created 2011/11/03 · openalex publication_date 2011/12/19 · arxiv updated 2012/08/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study the dynamics of two initially correlated qubits coupled to their own separate spin baths modeled by an XY spin chain and find the explicit expression of the quantum discord for the system. A sudden transition is found to exist between classical and quantum decoherence by choosing certain initial states. We show that the sudden transition happens near the critical point, which provides an alternative way to characterize the quantum phase transition. Furthermore, we propose a scheme to prolong the transition time of the quantum discord by applying the bang-bang pulses.