Quantum reduced fidelity and quantum phase crossover in a spin ladder system with four‐spin exchange

Sun, Zhao‐Yu; Huang, Hailin; Wang, B.

doi:10.1002/pssb.201248368

Cited by 3 publications

(4 citation statements)

References 16 publications

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“…Recently the QPTs of the ladder have been studied through quantum information theory . The first‐order QPT points

θ_{1}

and

θ_{2}

are identified ambitiously by the sudden change of the entanglement concurrence ().…”

Section: Introductionmentioning

confidence: 99%

“…The critical point

θ_{4}

, which is a highly symmetric point of the system, is identified by the size‐independent extremal point of entanglement entropy (). In addition, recently we have found an effective way to identify the crossover point

θ_{6}

by analyzing the first‐excited state of the system (). Thus, in this paper, we will just pay our attention to the other two critical points

θ_{3}

and

θ_{5}

.…”

Section: Introductionmentioning

confidence: 99%

“…Recently the QPTs of the ladder have been studied through quantum information theory. [22,27,28] The firstorder QPT points θ 1 and θ 2 are identified ambitiously by the sudden change of the entanglement concurrence. [22] The critical point θ 4 , which is a highly symmetric point of the system, is identified by the size-independent extremal point of entanglement entropy.…”

Section: Introductionmentioning

confidence: 99%

“…[22] For the crossover point θ 6 , recently we have provided a very effective approach to identify its location by analyzing the first-excited state of the system. [28] Thus, in this paper, we will just pay our attention to the other two critical points θ 3 and θ 5 .…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Odd-even effect of quantum discord in the spin-1/2 Heisenberg two-leg ladder with ring exchange

Huang

Sun

Wang

2013

Phys. Status Solidi B

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The singularity of quantum correlation has been widely regarded as a valuable indicator for quantum phase transition (QPT) in low‐dimensional quantum systems. In this paper, in a two‐leg spin ladder with ring exchange, the critical points of the system cannot be detected by analyzing the singularity of the quantum discord (a kind of quantum correlation). Instead, the discord exhibits a novel odd–even effect in the symmetry‐breaking (SB) regions, which can be used to detect the two critical points between the SB regions and the non‐SB regions. The underlying mechanism of the odd–even effect is explained.

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“…Recently the QPTs of the ladder have been studied through quantum information theory . The first‐order QPT points