Polarization Entangled State Measurement on a Chip

Year: 2010

Authors: Sansoni L., Sciarrino F., Vallone G., Mataloni P., Crespi A., Ramponi R., Osellame R.

Autors Affiliation: Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; CNR, INO, I-50125 Florence, Italy; Museo Stor Fis, I-00184 Rome, Italy; Ctr Studi & Ric Enrico Fermi, I-00184 Rome, Italy; CNR, IFN, I-20133 Milan, Italy; Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy.

Abstract: The emerging strategy to overcome the limitations of bulk quantum optics consists of taking advantage of the robustness and compactness achievable by integrated waveguide technology. Here we report the realization of a directional coupler, fabricated by femtosecond laser waveguide writing, acting as an integrated beam splitter able to support polarization-encoded qubits. This maskless and single step technique allows us to realize circular transverse waveguide profiles which are able to support the propagation of Gaussian modes with any polarization state. Using this device, we demonstrate quantum interference with polarization-entangled states and singlet state projection.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 105 (20)      Pages from: 200503-1  to: 200503-4

More Information: This work was supported by the FARI project, Finanziamento Ateneo 2009 of Sapienza, FIRB-Futuro in Ricerca HYTEQ, and Finanziamento Ateneo 2009 of Politecnico di Milano.
KeyWords: Silica Wave-guides; Multiphoton Entanglement; Quantum
DOI: 10.1103/PhysRevLett.105.200503

Citations: 215
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