TY - JOUR
AB - We investigate multipartite entanglement in a noninteracting fermion gas, as a function of fermion
separation, starting from the many particle fermion density matrix. We prove that all multiparticle
entanglement can be built only out of two-fermion entanglement. Although from the Pauli exclusion
principle we would always expect entanglement to decrease with fermion distance, we surprisingly find
the opposite effect for certain fermion configurations. The von Neumann entropy is found to be
proportional to the volume for a large number of particles even when they are arbitrarily close to each
other. We will illustrate our results using different configurations of two, three, and four fermions at zero
temperature although all our results can be applied to any temperature and any number of particles.
AU - Lunkes, C.
AU - Brukner, Č.
AU - Vedral, V.
DA - 2005/07/13/
JF - Phys. Rev. Lett.
PY - 2005
SE - 2005/07/13/
TI - Natural Multiparticle Entanglement in a Fermi Gas
ER -