Polarization-entanglement conserving frequency conversion of photons

Details Polarization-entanglement conserving frequency conversion of photons Polarization-entanglement conserving frequency conversion of photons

2011-06-09

arxiv.org/abs/1106.1867v1

Phys. Rev. A 85, 013845 (2012)

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.85.013845

Entangled photons play a pivotal role in the distribution of quantum information in quantum networks. However, the frequency bands for optimal transmission and storage of photons are not necessarily the same. Here we experimentally demonstrate the coherent frequency conversion of photons entangled in their polarization, a widely used degree of freedom in photonic quantum information processing. We verify the successful entanglement conversion by violating a Clauser-Horne-Shimony-Holt (CHSH) Bell inequality and fully confirm that our characterised fidelity of entanglement transfer is close to unity using both state and process tomography. Our implementation is robust and flexible, making it a practical building block for future quantum networks.

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