Quantum teleportation with squeezed vacuum states

We show how the partial entanglement inherent in a two-mode squeezed vacuum state admits two different teleportation protocols. These two protocols re fer to the different kinds of joint measurements that may be made by the se nder. One protocol is the recently implemented quadrature phase approach of Braunstein and Kimble [Phys. Rev. Lett. 80, 869 (1998)]. The other is base d on recognizing that a two-mode squeezed vacuum state is also entangled wi th respect to photon-number difference and phase sum. We show that this pro tocol can also realize teleportation; however, limitations can arise due to the fact that the photon-number spectrum is bounded from below by zero. Ou r examples show that a given entanglement resource may admit move than a si ngle teleportation protocol and the question then arises as to what is the optimum protocol in the general case. [S1050-2947(99)08808-3].