2016/10/31 by Subhadeep Chakraborty, Amarendra K. Sarma
Computer Science · Physics and Astronomy · #Coupling (piping) #Force Microscopy Techniques and Applications #Gaussian #Kerr effect #Materials science #Mechanical and Optical Resonators #Nonlinear system #Physics #Power (physics) #Quantum #Quantum Information and Cryptography #Quantum correlation #Quantum discord #Quantum entanglement #Quantum mechanics #Statistical physics #Work (physics) #physics.optics #quant-ph
paper · pdf · doi:10.1364/josab.34.001503
arxiv created 2016/12/21 · openalex created_date 2017/01/06 · openalex publication_date 2017/06/22 · arxiv updated 2017/08/02 · openalex updated_date 2026/08/05
In this work, we theoretically study the quantum correlations present in an optomechanical system by invoking an additional cross-Kerr-type coupling between the optical and mechanical modes. Under experimentally achievable conditions, we first show that a significant enhancement of the steady-state entanglement could be achieved at a considerably lower driving power, which is also extremely robust with respect to the system parameters and environmental temperature. We then employ Gaussian quantum discord (QD) as a more genuine measure of the quantumness of the correlation. We find that in the presence of cross-Kerr nonlinearity, QD becomes more robust and survives up to a much higher number of thermal phonons as compared to the optomechanical entanglement.