Abstract
Here we report the experimental implementation of a linear-optics partial
Bell-state analyzer following the propagation of single-photons through long
telecommunication optical fibers. Polarization encoded weak coherent states
were sent from independent remote continuous wave faint laser sources over
two 8.5 km long optical fiber spools. Automatic polarization stabilization
systems were used in each spool to compensate the random polarization drift.
We demonstrate stable two-photon interference with a dip visibility of 47.8%
over a 40 minute time-interval, close to the theoretical maximum of 50% for
weak coherent states. We successfully show that it is possible to carry out
remote long-distance Bell-state analysis of polarization weak coherent states
in spite of random residual birefringence fluctuations in optical fibers.
These results pave the way for important applications in quantum communications
with polarization qubits such as measurement device-independent quantum key
distribution and quantum repeaters.
© 2013 IEEE
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