Polarization Entangled State Measurement on a Chip
2010; American Physical Society; Volume: 105; Issue: 20 Linguagem: Inglês
10.1103/physrevlett.105.200503
ISSN1092-0145
AutoresLinda Sansoni, Fabio Sciarrino, Giuseppe Vallone, Paolo Mataloni, Andrea Crespi, Roberta Ramponi, Roberto Osellame,
Tópico(s)Advanced Fiber Laser Technologies
ResumoThe 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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