Abstract
In this paper, we discuss the properties of one dimensional quantum Zakharov system which describes the nonlinear interaction between the quantum Langmuir and quantum ion-acoustic waves. The system (1a)-(1b) with initial data (E(0), n(0), ∂ <sub>t</sub> n(0)) ϵ H <sup>k</sup> ⊕ H <sup>l</sup> ⊕ H <sup>l-2</sup> is local well-posedness in low regularity spaces (see Theorem 1.1 and Figure 1). Especially, the low regularity result for k satisfies -3/4 < k ≤ -1/4 is obtained by using the key observation that the convoluted phase function is convex and careful bilinear analysis. The result can not be obtained by using only Strichartz inequalities for "Schrödinger" waves.