Applied Research of Quantum Information Based on Linear by Xiaoye Xu
By Xiaoye Xu
This thesis reviews on striking paintings in major subfields of quantum details technological know-how: one contains the quantum dimension challenge, and the opposite matters quantum simulation. The thesis proposes utilizing a polarization-based displaced Sagnac-type interferometer to accomplish partial cave in dimension and its reversal, and provides the 1st experimental verification of the nonlocality of the partial cave in dimension and its reversal. all the experiments are performed within the linear optical method, one of many earliest experimental platforms to hire quantum communique and quantum details processing. The thesis argues that quantum size can yield quantum entanglement restoration, that is tested by utilizing the frequency freedom to simulate the surroundings. in response to the susceptible dimension thought, the writer proposes that white gentle can be utilized to exactly estimate part, and successfully demonstrates that the imaginary a part of the susceptible worth could be brought via vulnerable size evolution. finally, a nine-order polarization-based displaced Sagnac-type interferometer utilising bulk optics is developed to accomplish quantum simulation of the Landau-Zener evolution, and by way of tuning the process Hamiltonian, the 1st scan to analyze the Kibble-Zurek mechanism in non-equilibrium kinetics procedures is conducted within the linear optical system.
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1999). Reprinted with permission from Ref. Kwiat et al. (1999). Copyright 1998 by American Physical Society cleverly utilized the space symmetry in SPDC process, selected the specific points and erased the spatial distinguishability to directly obtain polarization-entangled photon pairs with high fidelity. , proposed to directly produce polarization-entangled photon pairs by bounding together two pieces of nonlinear crystals cut in type I phase matching condition and with their optical axes vertical to each other (Kwiat et al.
Reprinted with permission from Ref. Bennink et al. (2006). Copyright 1998 by American Physical Society producing parametric light inside crystal. The parametric light of e-polarization will have almost the same size of walk-off, making its beam waist approximately equal to the small beam waist of focused pump. While, the beam waist of the parametric of o-polarization will become larger due to pump walk-off. As the product of the beam waist and the divergence angle of two parametric light beams are the same, the divergence angle of the parametric light of e-polarization is much larger than that of o-polarization.
2002). Dark count is the error count given by the SPD without signal photon incidence, which is generally caused by material consisting of the SPD, the bias voltage and the ambient noise. Detection efficiency is defined as the probability when a single photon arrives at the SPD and the detector captures it and gives a count signal. The detection efficiency of SPD is strictly specified in many experiments, such as experiments verifying Bell’s inequality (Matsukevich et al. 2008; Rowe et al. 2001).