Operationally accessible entanglement of one-dimensional spinless fermions
Operationally accessible entanglement of one-dimensional spinless fermions
复制标题
一维无旋费米子的可操作纠缠
DOI:
10.1103/physreva.100.022324
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发表时间:
2019
影响因子:
2.9
通讯作者:
Del Maestro, Adrian
中科院分区:
文献类型:
--
作者:
Barghathi, Hatem;Casiano-Diaz, Emanuel;Del Maestro, Adrian
For indistinguishable itinerant particles subject to a superselection rule fixing their total number, a portion of the entanglement entropy under a spatial bipartition of the ground state is due to particle fluctuations between subsystems and thus is inaccessible as a resource for quantum information processing. We quantify the remaining operationally accessible entanglement in a model of interacting spinless fermions on a one-dimensional lattice via exact diagonalization and the density matrix renormalization group. We find that the accessible entanglement exactly vanishes at the first-order phase transition between a Tomonaga-Luttinger liquid and phase separated solid for attractive interactions and is maximal at the transition to the charge density wave for repulsive interactions. Throughout the phase diagram, we discuss the connection between the accessible entanglement entropy and the variance of the probability distribution describing intrasubregion particle-number fluctuations.
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