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Fidelity Of Quantum State In The Course Of Quantum Teleportation

Posted on:2005-01-10Degree:MasterType:Thesis
Country:ChinaCandidate:Y L ZhangFull Text:PDF
GTID:2120360152968947Subject:Theoretical Physics
Abstract/Summary:PDF Full Text Request
Quantum information optics has been concerned greatly recent years, fidelity is a very important concept in the field of quantum optics and information science, which can be interpreted as the probability that a decoded message possesses the same information content as the message prior to coding and transmission and has been widely used on the studies of quantum teleportation and quantum calculation. On the other hand, we introduce fidelity amplitude that weighs the stand or fall of quantum information transmission result. The high fidelity and the low fidelity amplitude is, the better capability of information transition is. In this paper, pure quantum theory method was mainly applied to study fidelity evolution problem of some typical models of quantum optics, researches on fidelities of the interacting systems between field and atom have been studied deeply. In this paper, we discuss fidelities and fidelity amplitudes for some models including single-mode field interacting with atom system, two-mode field interacting with atom system, field interacting with atom by multiphoton process system and binomial field interacting with atom system and find some meaning result. Results show that initial photon of field, initial atom state, detuning, photon-difference of two-mode field, coupling constant between atoms and atom and field affect fidelity of systems. Essence of fidelity evolution can be summed up, when correlation between field and atom is strengthened, fidelities of systems decrease; and the interacting between field and atom is weakened, fidelities of systems increase.
Keywords/Search Tags:fidelity, fidelity amplitude, quantum information
PDF Full Text Request
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