Partial entropy in finite-temperature phase transitions
Junpeng Cao, Xiaoling Cui, Zhang Qi, Wengang Lu, Qian Niu et al.
It is shown that the von Neumann entropy, a measure of quantum entanglement, does have its classical counterpart in thermodynamic systems, which we call partial entropy. Close to the critical temperature, the partial entropy shows perfect finite-size scaling behavior even for quite small system size ... [Phys. Rev. B 75, 172401 (2007)] published Thu May 3, 2007.
Entanglement detection for electrons via witness operators
Lara Faoro and Fabio Taddei
We discuss an implementation of the entanglement witness, a method to detect entanglement with few local measurements, in systems where entangled electrons are generated both in the spin and orbital degrees of freedom. We address the efficiency of this method in various setups, including two differe ... [Phys. Rev. B 75, 165327 (2007)] published Mon Apr 30, 2007.
Genuine tripartite entanglement in the noninteracting Fermi gas
T. Vertesi
We study genuine tripartite entanglement shared among the spins of three localized fermions in the noninteracting Fermi gas at zero temperature. First, we prove analytically with the aid of entanglement witnesses that in a particular configuration the three fermions are genuinely tripartite entangle ... [Phys. Rev. A 75, 042330 (2007)] published Mon Apr 30, 2007.
Scaling of the von Neumann entropy in a two-electron system near the ionization threshold
Omar Osenda and Pablo Serra
The critical behavior of entanglement near a quantum phase transition has been studied intensely over the past few years. Few-body quantum systems show critical behavior near the ionization point. We investigate the scaling properties of the von Neumann entropy for an atomiclike system near the ioni ... [Phys. Rev. A 75, 042331 (2007)] published Mon Apr 30, 2007.
Entanglement of collectively interacting harmonic chains: An effective two-dimensional system
R. G. Unanyan, M. Fleischhauer, and D. Bruss
We study the ground-state entanglement of one-dimensional harmonic chains that are coupled to each other by a collective interaction as realized, e.g., in an anisotropic ion crystal. Due to the collective type of coupling, where each chain interacts with every other one in the same way, the total sy ... [Phys. Rev. A 75, 040302 (2007)] published Fri Apr 27, 2007.