Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.200503
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Funding
- FARI project
- Finanziamento Ateneo 2009 of Sapienza
- FIRB-Futuro in Ricerca HYTEQ
- Finanziamento Ateneo 2009 of Politecnico di Milano
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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.
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