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Massive-mode polarization entangled biphoton frequency comb.

ABSTRACT: A frequency-multiplexed entangled photon pair and a high-dimensional hyperentangled photon pair are useful to realize a high-capacity quantum communication. A biphoton frequency comb (BFC) with entanglement can be used to prepare both states. We demonstrate polarization entangled BFCs with over 1400 frequency modes, which is approximately two orders of magnitude larger than those of earlier entangled BFCs, by placing a singly resonant periodically poled LiNbO₃ waveguide resonator within a Sagnac loop. The BFCs are demonstrated by measuring the joint spectral intensity, cross-correlation, and autocorrelation. Moreover, the polarization entanglement at representative groups of frequency modes is verified by quantum state tomography, where each fidelity is over 0.7. The efficient generation of a massive-mode entangled BFC is expected to accelerate the increase of capacity in quantum communication.

SUBMITTER: Yamazaki T

PROVIDER: S-EPMC9142512 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature

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Massive-mode polarization entangled biphoton frequency comb.

Yamazaki Tomohiro T Ikuta Rikizo R Kobayashi Toshiki T Miki Shigehito S China Fumihiro F Terai Hirotaka H Imoto Nobuyuki N Yamamoto Takashi T

Scientific reports 20220527 1

A frequency-multiplexed entangled photon pair and a high-dimensional hyperentangled photon pair are useful to realize a high-capacity quantum communication. A biphoton frequency comb (BFC) with entanglement can be used to prepare both states. We demonstrate polarization entangled BFCs with over 1400 frequency modes, which is approximately two orders of magnitude larger than those of earlier entangled BFCs, by placing a singly resonant periodically poled LiNbO<sub>3</sub> waveguide resonator with ...[more]

PMID: 35624230

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