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We propose a physical realization of symmetric telecloning machine for spin quantum states. The concept of area average fidelity is introduced to describe the telecloning quality. It is indicated that for certain input states this quantity may come to an enough high level to satisfy the need of quantum information processing. We also study the properties of entanglement distribution via the spin chain for arbitrary two-qubit entangled pure states as inputs and find that the decay ratio of entanglement for the output states is only determined by the parameters of spin chain and waiting time, independent of the initial input states. 相似文献
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Properties on the distant distribution of entanglement for arbitrary two-qubit pure states via noisy quantum channels 下载免费PDF全文
This paper investigates the change of entanglement for transmitting
an arbitrarily entangled two-qubit pure state via one of three
typical kinds of noisy quantum channels: amplitude damping
quantum channel, phase damping quantum channel and depolarizing
quantum channel. It finds, in all these three cases, that the output
distant entanglement (measured by concurrence) reduces
proportionately with respect to its initial amount, and the decaying
ratio is determined only by the noisy characteristics of quantum
channels and independent of the form of initial input state. 相似文献
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