Nonlinear effects on the dynamics of quantum harmonic modes coupled through angular momentum. (7th October 2020)

• Record Type: Journal Article
• Authors: Canosa, N; Rossignoli, R; García, Javier; Mandal, Swapan; Chandra Saha, Kartick
• Is Part Of: Journal of physics. Volume 53:Number 21(2020:Nov. 01)
• Publication Date: 2020-10-07
• Subjects: quantun dynamics -- coupled harmonic modes -- nonlinear effects -- quantum entanglement; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/1361-6455/abb3ad
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: We investigate nonlinear effects on the dynamics of entanglement and other quantum observables in a system of two harmonic modes coupled through angular momentum. The nonlinearity arises from a Kerr-type anharmonic term in each mode. The emergence and evolution of entanglement, non-Gaussianity, photon number, photon antibunching and squeezing are examined for different initial coherent product states and couplings, through exact 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 and stabilizing 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 approximate expressions are also provided.