کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1860541 | 1037438 | 2016 | 5 صفحه PDF | دانلود رایگان |
• LQU is suitable for the analysis of block correlations.
• LQU exhibits pronounced behavior at quantum phase transitions.
• LQU exponentially saturates in the quantum search.
• Concavity of LQU indicates criticality in the Ising chain.
We investigate the local quantum uncertainty (LQU) between a block of L qubits and one single qubit in a composite system of n qubits driven through a quantum phase transition (QPT). A first-order QPT is analytically considered through a Hamiltonian implementation of the quantum search. In the case of second-order QPTs, we consider the transverse-field Ising chain via a numerical analysis through density matrix renormalization group. For both cases, we compute the LQU for finite-sizes as a function of L and of the coupling parameter, analyzing its pronounced behavior at the QPT.
Journal: Physics Letters A - Volume 380, Issue 20, 29 April 2016, Pages 1724–1728