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Quantum information teleport with distinct color fields.

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Author(s):
Igor Konieczniak
Total Authors: 1
Document type: Doctoral Thesis
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Instituto de Física
Defense date:
Examining board members:
Marcelo Martinelli; Daniel Felinto Pires Barbosa; Fernando Tadeu Caldeira Brandt; Antonio Martins Figueiredo Neto; Antonio Zelaquett Khoury
Advisor: Marcelo Martinelli
Abstract

In 1993, Bennett et al. [6] proposed a teleportation protocol of a quantum state by means of two communication channels of distinct natures: A classical channel, formed by two classical information pathways, and a quantum channel, formed by a pair of entangled systems. After some successful implementations in the discrete variables domain, in 1998 arises a continuous variables version of the teleportation protocol [1]. In the same year, Furusawa et al. accomplish the unconditional quantum teleportation based on continuous variables of the field. [2]. Recently, entanglement in the continuous variables domain between bright beams of light with different colors was measured [3, 4, 5]. In this work we report the advances on the teleportation protocol implementation between bright fields of distinct colors. After some struggle, we managed to build an Optical Parametric Oscillator (OPO) witch presented it self as a reasonable source of entangled bright beams. The setup required for the execution of the protocol was built and installed. This was followed by several tests to ensure the combined working of all parts. The teleportation of a nondisplaced vacuum state was one of the performed tests, on wich we achieved promising results. After setup adjustments and the developing of data analysis techniques to provide the production, detection and analysis of displaced states of the field, the protocol was run with this kind of states. We reached a fidelity of 45% for a displaced input state, while the fidelity considering only the variances was up to 60%. To prove the success of our quantum teleportation protocol, some optimizations and changes in the operation of the OPO are in plan, whereby we expect soon to surpass the 50% fidelity benchmark, corresponding to the classical limit. (AU)

FAPESP's process: 12/25245-3 - Teleportation of quantum information between fields of different colors
Grantee:Igor Konieczniak
Support type: Scholarships in Brazil - Doctorate