Hao, HX (reprint author), Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China.
; Feng, Shiping
; Yang, Shi-Jie] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China
; [Yang, Shi-Jie] Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
We study quantum coherence of strongly interacting cold bosons in a double-well potential driven by a laser field. The system is initially in a Fock state and, either with or without a static tilting field, evolves into coherent states. The coherence is resonantly enhanced by photon-assisted tunneling. For the tilted wells, it reveals a two-branch pattern that corresponds to multiple photon absorption or emission.