The Study Of Photon Blockade In A Driven Optomechanical System

Single-photon source plays an important role in quantum information and quantum communication,the study of preparation and manipulation for it has attracted lots of re-searchers, as its significance in both theoretical research,experimental applications and practicability.In recent years, the rapid developments of the cavity optomechanical sys-tems provided us a new way to study the quantum phenomena and optical effect, espe-cially helped us to realize a single photon source through the photon blocking mechanism with its nonlinear which originates from the interaction between the cavity and mechanical oscillator.In this paper,we will investigate how to prepare a single-photon source in a cavity op-tomechanical system,where both the cavity mode and the mechanical oscillator are driven under low-temperature limit.we study the photon statistics with the second-order correla-tion function obtained by solving the master function and analytical approximate results. Our calculations show that a strong photon blockade which prevents subsequent photons from resonantly entering the cavity could be obtained in strong optomechanical interaction regime.and the additional driving on the mechanical oscillator could decrease the min-imum value of g(2)(0),which shows a stronger photon antibunching effect.We also study the photon statistics of the cavity in an optomechanical system via second-order correlation functions. Our calculations show that the cavity can exhibit strong photon antibunching even when optomechanical interaction in the optomechanical system is weak.Contrarily to common expectation,this unconventional photon blockade originates from destructive quantum interference between different excitation pathways bringing from the ground to two-photon states.We also derivate a optimal conditions for strong photon antibunching of cavity mode,which are dependent on the detuning and the relative phase between the driving fields that can be tuned precisely in experiments.This is important for the future generation of a tunable single-photon sources.