Two-color Bell states heralded via entanglement swapping
Sofiane Merkouche, Val\'erian Thiel, Alex O. C. Davis, Brian J. Smith
TL;DR
This paper demonstrates entanglement swapping of time-frequency entangled photons, creating heralded two-color Bell states verified through interference, with potential applications in tunable frequency-bin entangled photon sources.
Contribution
It introduces a method for heralding two-color Bell states via frequency-resolved Bell-state measurement without filters, advancing quantum communication capabilities.
Findings
Successful entanglement swapping of time-frequency photons
Verification of two-color entanglement through quantum beating
Potential for highly-tunable frequency-bin entangled photon sources
Abstract
We report on an experiment demonstrating entanglement swapping of time-frequency entangled photons. We perform a frequency-resolved Bell-state measurement on the idler photons from two independent entangled photon pairs, which projects the signal photons onto a two-color Bell state. We verify entanglement in this heralded state using two-photon interference and observing quantum beating without the use of filters, indicating the presence of two-color entanglement. Our method could lend itself to use as a highly-tunable source of frequency-bin entangled single photons.
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Taxonomy
TopicsNeural Networks and Reservoir Computing · Quantum Information and Cryptography · Mechanical and Optical Resonators