Quantum Teleportation And Teleporting Of N-particle Quantum State

This thesis investigates the basic theory of quantum teleportation and discusses the schemes of teleporting three and N particles arbitrarily quantum states. The quantum teleportation means that when one teleports the unknown quantum state ψof a particle at place A to another one at place B, enable another particle to be the quantum state of ψand the original particle remains at the primary place. Due to the uncertain principal of quantum mechanics, one cannot extract all information from the original quantum state exactly. Therefore, one divides all information of the original quantum state into two parts: general information and quantum information. A classical channel informs general information and quantum information is informed by quantum channel. According to these messages, one can configure all information of the original quantum state at place B. In the scheme of teleporting an arbitrary three-particle entangled state, the collective unitary transformation performed by Bob is different from in others. The unitary transformation we named U transformation is same for different quantum state belonging to Bob. Then Bob establishes a correspondence we named σtransformation. The σtransformation is different for different results of Alice's Bell-state measurement. According to four different results of Alice's Bell-state measurement, there are four σtransformations. In the scheme of teleporting an arbitrary N -particles quantum state, while N EPR pairs are used as quantum channels, the teleportation can be complete realized and can easy be realized in physics. If the quantum channel is composed of n nor maximally entangled particle pairs, which is written , it can be realized with some probability. The probability of successful teleportation . The collective unitary transformation performed by Bob is for single particle.