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Optics Express

Hong−Ou−Mandel dip measurements of polarization-entangled photon pairs at 1550 nm

Yinghong Xue, Akio Yoshizawa, Hidemi Tsuchida

Published Apr 2, 2010• 16 citations
Publisher

Abstract

We performed a quantum interference experiment using two polarization-entangled photon pairs at 1550 nm, created in periodically poled lithium niobate waveguides. Using four-fold coincidences, a Hong-Ou-Mandel dip at diagonal polarization was observed with a visibility of 74.5% before subtracting accidental coincidences. This experiment lays a foundation for demonstrating polarization-based entanglement swapping and for realizing a quantum relay.

DOI
10.1364/oe.18.008182

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Applied Physics Letters•Sep 27, 2004•34 citations
We performed a quantum interference experiment using two polarization-entangled photon pairs at 1550 nm, created in periodically poled lithium niobate waveguides. Using four-fold coincidences, a Hong-Ou-Mandel dip at diagonal polarization was observed with a visibility of 74.5% before subtracting accidental coincidences. This experiment lays a foundation for demonstrating polarization-based entanglement swapping and for realizing a quantum relay.
Mandel dip measurement was performed at 1550 nm using photon pairs created via spontaneous parametric down conversion in two separately located periodically poled lithium niobate waveguides. A visibility of 77.6% was obtained in fourfold coincidence counting. We experimentally clarified that the simultaneous generation of three pairs (one pair created in one waveguide and two pairs created in another waveguide) is the main source of accidental coincidence counts. Propagation loss before mixing two photons at a beamsplitter for observing photon bunching plays an important role in the determination of visibility. A large loss improves visibility, but also reduces the number of fourfold coincidence counts.