Nonclasscial interference between independent intrinsically pure single photons at telecom wavelength
Ruibo Jin, Kentaro Wakui, Ryosuke Shimizu, Hugo Benichi, Shigehito, Miki, Taro Yamashita, Hirotaka Terai, Zhen Wang, Mikio Fujiwara, Masahide, Sasaki
TL;DR
This paper demonstrates high-visibility Hong-Ou-Mandel interference between independent, intrinsically pure single photons at telecom wavelength, highlighting advances in photon source brightness and detection for quantum communication.
Contribution
It reports the first high-visibility interference between independent pure photons at telecom wavelength without bandpass filters, using group-velocity-matched SPDC and SNSPDs.
Findings
Achieved 85.5% interference visibility without filters
4-fold coincidence counts are ten times higher than previous experiments
Highlights potential for practical quantum communication systems
Abstract
We demonstrate a Hong-Ou-Mandel interference between two independent, intrinsically pure, heralded single photons from spontaneous parametric down conversion (SPDC) at telecom wavelength. A visibility of was achieved without using any bandpass filter. Thanks to the group-velocity-matched SPDC and superconducting nanowire single photon detectors (SNSPDs), the 4-fold coincidence counts are one order higher than that in the previous experiments. The combination of bright single photon sources and SNSPDs is a crucial step for future practical quantum info-communication systems at telecom wavelength.
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