Positive operator-valued measure for two-photon detection via sum-frequency generation

Merkouche, Sofiane; Smith, Brian J.

doi:10.1103/physreva.103.043711

Cited by 4 publications

References 31 publications

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Spectrally resolved four-photon interference of time-frequency-entangled photons

Merkouche

Smith

2022

Phys. Rev. A

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Pairs of photons entangled in their time-frequency degree of freedom are of great interest in quantum optics research and applications, due to their relative ease of generation and their high capacity for encoding information. Here we analyze, both theoretically and experimentally, the behavior of phase-insensitive spectrally-resolved interferences arising from two pairs of time-frequency entangled photons. At its core, this is a multimode entanglement swapping experiment, whereby a spectrally resolved joint measurement on the idler photons from both pairs results in projecting the signal photons onto a Bell state whose form depends on the measurement outcome. Our analysis is a thorough exploration of what can be achieved using time-frequency entanglement and spectrally-resolved Bell-state measurements.

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Spectrally resolved four-photon interference of time-frequency-entangled photons

Merkouche

Smith

2022

Phys. Rev. A

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Heralding Multiple Photonic Pulsed Bell Pairs via Frequency-Resolved Entanglement Swapping

Merkouche

Davis²,

Smith³

2022

Phys. Rev. Lett.

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Entanglement is a unique property of quantum systems and an essential resource for many quantum technologies. The ability to transfer or swap entanglement between systems is an important protocol in quantum information science. Entanglement between photons forms the basis of distributed quantum networks and the demonstration of photonic entanglement swapping is essential for their realization. Here an experiment demonstrating entanglement swapping from two independent multimode time-frequency entangled sources is presented, resulting in multiple heralded temporal-mode Bell states. Entanglement in the heralded states is verified by measuring conditional anti-correlated joint spectra as well as quantum beating in two-photon interference. Our proof-of-concept experiment is able to distinguish up to five orthogonal Bell pairs within the same setup, limited in principle only by the entanglement of the sources.

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Experimental feasibility of molecular two-photon absorption with isolated time-frequency-entangled photon pairs

Landes

Allgaier

Merkouche

et al. 2021

Phys. Rev. Research

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Positive operator-valued measure for two-photon detection via sum-frequency generation

Cited by 4 publications

References 31 publications

Spectrally resolved four-photon interference of time-frequency-entangled photons

Spectrally resolved four-photon interference of time-frequency-entangled photons

Heralding Multiple Photonic Pulsed Bell Pairs via Frequency-Resolved Entanglement Swapping

Experimental feasibility of molecular two-photon absorption with isolated time-frequency-entangled photon pairs

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