title: Entanglement of indistinguishable particles shared between two parties.
abstract: Using an operational definition we quantify the entanglement, E(P), between two parties who share an arbitrary pure state of N indistinguishable particles. We show that E(P)< or =E(M), where E(M) is the bipartite entanglement calculated from the mode-occupation representation. Unlike E(M), E(P) is superadditive. For example, E(P)=0 for any single-particle state, but the state |1>|1>, where both modes are split between the two parties, has E(P)=1/2. We discuss how this relates to quantum correlations between particles, for both fermions and bosons.
authors.affiliation: Centre for Quantum Computer Technology, Centre for Quantum Dynamics, School of Science, Griffith University, Brisbane, Queensland 4111, Australia.
authors.forename: H M
authors.initials: HM
authors.lastname: Wiseman
authors.forename: John A
authors.initials: JA
authors.lastname: Vaccaro