Entanglement swapping with quantum-memory-compatible photons
Jeongwan Jin, Marcel.li Grimau Puigibert, Lambert Giner, Joshua A., Slater, Michael R. E. Lamont, Varun B. Verma, M. D. Shaw, Francesco Marsili,, Sae Woo Nam, Daniel Oblak, and Wolfgang Tittel
TL;DR
This paper demonstrates entanglement swapping using time-bin entangled photons compatible with quantum memories, advancing the development of quantum repeaters for long-distance quantum communication.
Contribution
The experiment shows successful entanglement swapping with photons suitable for integration into quantum memory systems, a key step towards scalable quantum networks.
Findings
Entanglement between 795 nm photons verified via quantum state tomography.
Wavelength and bandwidth compatibility with Tm:LiNbO3 quantum memories.
Successful Bell state projection of 1533 nm photons.
Abstract
We report entanglement swapping with time-bin entangled photon pairs, each constituted of a 795 nm photon and a 1533 nm photon, that are created via spontaneous parametric down conversion in a non-linear crystal. After projecting the two 1533 nm photons onto a Bell state, entanglement between the two 795 nm photons is verified by means of quantum state tomography. As an important feature, the wavelength and bandwidth of the 795 nm photons is compatible with Tm:LiNbO3-based quantum memories, making our experiment an important step towards the realization of a quantum repeater.
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