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Quantum information processing with continuous variables

Grant number: 10/52282-1
Support type:Regular Research Grants
Duration: January 01, 2011 - January 31, 2013
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Cooperation agreement: CNRS
Principal researcher:Marcelo Martinelli
Grantee:Marcelo Martinelli
Principal researcher abroad: Claude Fabre
Institution abroad: Université Pierre et Marie Curie (Paris 6), France
Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:09/52157-5 - Teleportation of quantum information between different colors, AP.R


In quantum optics, the measurements involving quadratures of the field generally use the beat signal involving the central carrier of the field and the noise contained in the two sidebands. This characteristic feature of the detection implies a limitation to the direct application of entanglement tests proposed in the theory, involving covariances among single field modes. We plan to investigate this problem in detail, and to make direct observations of its implications in Optical Parametric Oscillators, both above and below threshold. The understanding of this phenomenon is important for an optimized implementation of quantum information processing protocols, as is the case of teleportation. (AU)

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Scientific publications (4)
(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.
COELHO, A. S.; BARBOSA, F. A. S.; CASSEMIRO, K. N.; MARTINELLI, M.; VILLAR, A. S.; NUSSENZVEIG, P. Analyzing the Gaussian character of the spectral quantum state of light via quantum noise measurements. Physical Review A, v. 92, n. 1 JUL 13 2015. Web of Science Citations: 3.
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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