TY - JOUR
T1 - Ground-state instabilities and entanglement in the spin-boson model
AU - Liu, Ru Fen
AU - Chen, Chia Chu
N1 - Funding Information:
This work was supported by the National Science Council of R.O.C. under the Grant No. NSC 93-2112-M-006-006 and 94-2112-M-006-016. The support from the Center for QIS at NCKU and the Tainan Branch of the National Center for Theoretical Sciences of Taiwan are acknowledged.
PY - 2007/2/1
Y1 - 2007/2/1
N2 - Ground-state instabilities of the spin-boson model is studied in this work. The existence of sequential ground-state instabilities is shown analytically for arbitrary detuning in the two-spin system. In this model, extra discontinuities of concurrence (entanglement measure) are found in the finite system, which do not appear in the on-resonant model. The above results remain intact by including extra boson modes. Moreover, by including extra modes, it is found that ground-state entanglement can be obtained and enhanced even in the weak coupling regime.
AB - Ground-state instabilities of the spin-boson model is studied in this work. The existence of sequential ground-state instabilities is shown analytically for arbitrary detuning in the two-spin system. In this model, extra discontinuities of concurrence (entanglement measure) are found in the finite system, which do not appear in the on-resonant model. The above results remain intact by including extra boson modes. Moreover, by including extra modes, it is found that ground-state entanglement can be obtained and enhanced even in the weak coupling regime.
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U2 - 10.1016/j.physa.2006.08.063
DO - 10.1016/j.physa.2006.08.063
M3 - Article
AN - SCOPUS:33751074724
VL - 374
SP - 631
EP - 645
JO - Physica A: Statistical Mechanics and its Applications
JF - Physica A: Statistical Mechanics and its Applications
SN - 0378-4371
IS - 2
ER -