Deterministic Joint Remote State Preparation Of Arbitrary Two-and Three-Qubit States

Quantum information science is a interdiscipline which applies quantum me-chanics to information science and technology, mainly including quantum computa-tion and quantum communication. The development of quantum information pro-cessing technologies can make a revolutionary contribution to the potentiality and security of information processing and communication systems. Quantum system, in which quantum information is prepared, transmitted and stored, often interacts with environment, which results in the loss of information, and this phenomenon is called decoherence, which will decrease the quality of entanglement and make the quantum communication insecure. Due to the unique quantum correlation features of quantum entangled state, quantum information processing is inseparable from the quantum entanglement. Therefore, quantum entangled states have been recognized as special physical resources to accomplish various intriguing tasks in quantum infor-mation processing, such as quantum teleportation, quantum dense coding, quantum cryptography, and so on. So, study of quantum decoherence and quantum entangled state preparation is necessary.Because quantum decoherence can destroy quantum entanglement, improving our understanding on entanglement dynamics and properties is necessary for ma-nipulating entanglement and resisting the influence of decoherence. Therefore, We investigate the effects of quantum decoherence generated by Unruh effect in non-inertial frames under amplitude damping channel and phase damping channel, re-spectively, when the Unruh single particle has right and left components. We not only consider the influence of acceleration on entanglement, but also consider the influence of different rate between right and left components of Unruh single particle state on entanglement. We find when the Unruh single particle state has right and left components, i.e.,|1>u=qL|0>r|1>Π+qR|1>Ⅱ|0>Ⅱ,|qR|2+|qL|2=1, with qL≠0, there appears the sudden death of entanglement, which occurs earlier under both amplitude damping channel and phase damping channel with the increase of accel-eration than that when the Unruh single particle state only has right component (qR=1,qL=0). We also find the initial entanglement decreases with the decrease of qR from1to1/21/2.In many entangled state preparation schemes, the sender knows all the infor-mation encoded in the quantum state, i.e., the coded information can be leaked out completely. In order to solve the problem of security, joint remote state preparation (JRSP) protocols have come into being. In JRSP, more senders are involved into the operation, and all the information of the state is split among the senders so that all the senders must jointly perform the task but no one among them is able to identify the full content of the encoded information by himself. We propose a novel deterministic protocol that two senders are capable of remotely preparing arbitrary two-and three-qubit states for a remote receiver using EPR pairs and GHZ state as the quantum channel. Compared with the existing deterministic protocols, the quantum resources and classical information in our scheme are decreased, and the whole operation process is simplified.