01201nas a2200193 4500008004100000245006800041210006700109260001200176300001100188490000700199520063100206653003000837653001300867100002200880700001600902700001900918700002100937856004900958 2005 eng d00aSpin Gases: Quantum Entanglement Driven by Classical Kinematics0 aSpin Gases Quantum Entanglement Driven by Classical Kinematics c10/2005 a1805020 v953 aA spin gas is a natural extension of a classical gas. It consists of a large number of particles whose (random) motion is described classically, but, in addition, have internal (quantum mechanical) degrees of freedom that interact during collisions. For specific types of quantum interactions we determine the entanglement that occurs naturally in such systems. We analyze how the evolution of the quantum state is determined by the underlying classical kinematics of the gas. For the Boltzmann gas, we calculate the rate at which entanglement is produced and characterize the entanglement properties of the equilibrium state.10aentanglement distribution10aspin gas1 aCalsamiglia, John1 aHartmann, L1 aDür, Wolfgang1 aBriegel, Hans, J uhttp://link.aps.org/abstract/PRL/v95/e180502