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The Generation of Quantum State and Implementation of Entanglement State Analyzers Based on the Leaked Cavity
Author: ChenXiaoDong
Tutor: LinXiuMin
School: Fujian Normal University
Course: Theoretical Physics
Keywords: Cavity decay GHZ state Cluster state Bellstate analyzer GHZstate analyzer
CLC: O431.2
Type: Master's thesis
Year: 2010
Downloads: 3
Quote: 0
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Abstract
Quantum information science, a new cross knowledge, is the application of the quantum mechanic on information science. Due to its incomparable superiority compared with classical information science, qantum information science has been attracting great concern since it is found.The many advantages in quantum information come from the coherence of quantum system. However, decoherence induced from the systemenvironment unavoidably coupling will spoil the coherence.. One has to spend a lot of physical resources so that eliminates or reduces the effect of decoherence. Cavity QED, as one of promising physical systems to realize quantum information processing, has attracted significant interest. Because the inexistence of the perfect reflecting mirror, the photons finally leak out from cavity after the photons being reflected by cavity, which will cause the decoherence of the cavity system. To solve the problem, people design many exquisite schemes to restrain or avoid the decoherence resulted from cavity decay.Recent researches show that the decoherence induced from cavity decay can be seemed as a positive effect replacing a negative one by designing an appropriate dynamics, and it can be applied to quantum information processing. In this dissertation, we continue to investigate how to create or identify entangled states by using cavity decay. Our main results include:1. We propose schemes to generate a ncoherentpulse GHZ state and a cluster state via a twosided leaked cavity. In the schemes, the nonlinearity interaction among the input coherent pulses is achieved. The cavity involved inthe proposals is a twosided cavity, which just is the practical cavity in current laboratory. And strong coupling condition is not required.2. Based on onesided cavities each trapping an alkali atom, the schemes for the analyzers of two photon Bell states and threephoton GreenbergerHorneZeilinger (GHZ) states are proposed, respectively. Moreover, all of twophoton Bell states and threephoton GHZ states can be nondestructively distinguished. The influence of atomic spontaneous emission and output coupling inefficiency are discussed. 3. The schemes are presented for realizing optical Bellstate and GHZstate analyzers through the Faraday rotation, which results from polarization photon being reflected by a onesided leaked optical cavity with trapped atom. It can be extended to completely distinguish photon Bellstate and GHZstate without destroying quantum qubit. In the schemes, strongcoupling condition is not needed and the analyzers can be implemented in lowQ cavity, which further lower the difficulties of experiment.

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CLC: > Mathematical sciences and chemical > Physics > Optics > The light nature of the theory > Quantum optics
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