Dynamical Relation between Quantum Squeezing and Entanglement in Coupled Harmonic Oscillator System

• Main Authors: Lock Yue Chew, Ning Ning Chung
• Format: Article
• Language: English
• Published: MDPI AG 2014-04-01
• Series: Symmetry
• Subjects: quantum entanglement; squeezed state; coupled harmonic oscillators
• Online Access: http://www.mdpi.com/2073-8994/6/2/295

In this paper, we investigate into the numerical and analytical relationship between the dynamically generated quadrature squeezing and entanglement within a coupled harmonic oscillator system. The dynamical relation between these two quantum features is observed to vary monotically, such that an enhancement in entanglement is attained at a fixed squeezing for a larger coupling constant. Surprisingly, the maximum attainable values of these two quantum entities are found to consistently equal to the squeezing and entanglement of the system ground state. In addition, we demonstrate that the inclusion of a small anharmonic perturbation has the effect of modifying the squeezing versus entanglement relation into a nonunique form and also extending the maximum squeezing to a value beyond the system ground state.