Non linear effects on the dynamics of quantum harmonic modes coupled through angular momentum

JAVIER GARCIA; CANOSA, N.; SWAPAN MANDAL; R. ROSSIGNOLI; KARTICK CHANDRA SAHA

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

IOP PUBLISHING LTD

Lugar: Londres; Año: 2020 vol. 53 p. 21540201 - 21540210

0953-4075

tWe investigate nonlinear effects on the dynamics of entanglement and other quantumobservables in a system of two harmonic modes coupled through angular momentum. Thenonlinearity arises from a Kerr-type anharmonic term in each mode. The emergence andevolution of entanglement, non-Gaussianity, photon number, photon antibunching andsqueezing are examined for different initial coherent product states and couplings, throughexact diagonalization in a truncated basis. It is shown that the anharmonic terms, even if weak,can lead to very significant effects for such initial states, considerably enhancing andstabilizing entanglement and leading to a non negligible non-Gaussianity of the evolved states.They also affect other observables, stabilizing the dynamics after an initial transient regime,for not too small initial average populations of each mode. Analytic short-time approximateexpressions are also provided