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Teleportation of quantum information between different colors


Since the assembling of the first Optical Parametric Oscillator in Brazil we have studied many aspects of this system that remained elusive, although they were predicted by the quantum theory and intensely studied by other research groups abroad. Afterwards, we demonstrated the entanglement of intense fields in the operation above threshold, predicted tripartite entanglement on the system, demonstrated quantum correlations between different colors separated by one octave, e finally identified the source of excess noise in this system and controlled it in order to obtain tripartite entanglement. We can affirm that we have achieved a unique degree of control of the OPO as a source of nonclassical states of the field. Our present proposal is to teleport quantum information over different parts of the electromagnetic spectra. We will use the OPO as a source of tripartite entangled states to extend the proposal of teleportation with continuous variables to beams of different colors. We can demonstrate the possibility to interconnect different systems used in quantum information processing, working on different wavelengths. This teleportation system will be a prototype for the expansion of quantum information processing, or can be used to convert entanglement from a wavelength fitted for interaction with "qubits" - atoms, for instance - to a wavelength fitted for communication - through optical fibers. For doing so, we need to evolve our OPO. The present degree of control is now limited by our optics, which demands upgrade in order to increase the level of entanglement, a technical challenge that requires better cavity mirrors. Manipulation of the quantum fields imply in the use of high quality Fabry-Perot cavities, used also as an auxiliary element for photodetection. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BARBOSA, F. A. S.; COELHO, A. S.; CASSEMIRO, K. N.; MARTINELLI, M.; NUSSENZVEIG, P.; VILLAR, A. S. Assumption-free measurement of the quantum state of light: Exploring the sidebands of intense fields. Physical Review A, v. 102, n. 6 DEC 7 2020. Web of Science Citations: 0.
BARBOSA, F. A. S.; COELHO, A. S.; CASSEMIRO, K. N.; NUSSENZVEIG, P.; FABRE, C.; MARTINELLI, M.; VILLAR, A. S. Beyond Spectral Homodyne Detection: Complete Quantum Measurement of Spectral Modes of Light. Physical Review Letters, v. 111, n. 20 NOV 14 2013. Web of Science Citations: 13.
BARBOSA, F. A. S.; COELHO, A. S.; CASSEMIRO, K. N.; NUSSENZVEIG, P.; FABRE, C.; VILLAR, A. S.; MARTINELLI, M. Quantum state reconstruction of spectral field modes: Homodyne and resonator detection schemes. Physical Review A, v. 88, n. 5 NOV 14 2013. Web of Science Citations: 8.

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