INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Entanglement of Two Oscillators Coupled by Angular Momentum
L. REBÓN; R. ROSSIGNOLI
Workshop; III Quantum Information Workshop Paraty2011; 2011
We examine the entanglement induced by an angular momentum coupling on two harmonic systems. The Hamiltonian corresponds to that of a charged particle in a uniform magnetic field in an anisotropic quadratic potential, and is equivalent to the intrinsic Hamiltonian of a particle in a rotating anisotropic quadratic potential. We analyze both the vacuum entanglement entropy in the dynamically stable phases, as well as the negativity of the thermal state in the fully stable sector. Analytic expressions are obtained through the general gaussian state formalism. It is shown that the vacuum entanglement saturates for sufficiently large fields and diverges at the edges of the stable sectors, whereas at finite temperature T > 0 entanglement exists just within certain field or frequency windows, remaining finite. The limit temperature for entanglement is also analyzed and shown to remain bounded in all stable sectors.