Details
| Original language | English |
|---|---|
| Article number | 233601 |
| Number of pages | 6 |
| Journal | Physical review letters |
| Volume | 131 |
| Issue number | 23 |
| Publication status | Published - 4 Dec 2023 |
Abstract
The Hong-Ou-Mandel (HOM) effect is crucial for quantum information processing, and its visibility determines the system's quantum-classical characteristics. In an experimental and theoretical study of the spectral HOM effect between a thermal field and a heralded single-photon state, we demonstrate that the HOM visibility varies dependent on the relative photon statistics of the interacting fields. Our findings reveal that multiphoton components in a heralded state get engaged in quantum interference with a thermal field, resulting in improved visibilities at certain mean photon numbers. We derive a theoretical relationship for the HOM visibility as a function of the mean photon number of the thermal field and the thermal part of the heralded state. We show that the nonclassicality degree of a heralded state is reflected in its HOM visibility with a thermal field; our results establish a lower bound of 41.42% for the peak visibility, indicating the minimum assignable degree of nonclassicality to the heralded state. This research enhances our understanding of the HOM effect and its application to high-speed remote secret key sharing, addressing security concerns due to multiphoton contamination in heralded states.
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In: Physical review letters, Vol. 131, No. 23, 233601, 04.12.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Spectral Hong-Ou-Mandel Effect between a Heralded Single-Photon State and a Thermal Field
T2 - Multiphoton Contamination and the Nonclassicality Threshold
AU - Khodadad Kashi, Anahita
AU - Caspani, Lucia
AU - Kues, Michael
N1 - Funding Information: This research was funded by the German Research Foundation (EXC 2122, Project ID 390833453); European Research Council (Grant Agreement No. 947603 (QFreC project)); Federal Ministry of Education and Research (PQuMal project, Quantum Futur Program); EPSRC (EP/V062492/1).
PY - 2023/12/4
Y1 - 2023/12/4
N2 - The Hong-Ou-Mandel (HOM) effect is crucial for quantum information processing, and its visibility determines the system's quantum-classical characteristics. In an experimental and theoretical study of the spectral HOM effect between a thermal field and a heralded single-photon state, we demonstrate that the HOM visibility varies dependent on the relative photon statistics of the interacting fields. Our findings reveal that multiphoton components in a heralded state get engaged in quantum interference with a thermal field, resulting in improved visibilities at certain mean photon numbers. We derive a theoretical relationship for the HOM visibility as a function of the mean photon number of the thermal field and the thermal part of the heralded state. We show that the nonclassicality degree of a heralded state is reflected in its HOM visibility with a thermal field; our results establish a lower bound of 41.42% for the peak visibility, indicating the minimum assignable degree of nonclassicality to the heralded state. This research enhances our understanding of the HOM effect and its application to high-speed remote secret key sharing, addressing security concerns due to multiphoton contamination in heralded states.
AB - The Hong-Ou-Mandel (HOM) effect is crucial for quantum information processing, and its visibility determines the system's quantum-classical characteristics. In an experimental and theoretical study of the spectral HOM effect between a thermal field and a heralded single-photon state, we demonstrate that the HOM visibility varies dependent on the relative photon statistics of the interacting fields. Our findings reveal that multiphoton components in a heralded state get engaged in quantum interference with a thermal field, resulting in improved visibilities at certain mean photon numbers. We derive a theoretical relationship for the HOM visibility as a function of the mean photon number of the thermal field and the thermal part of the heralded state. We show that the nonclassicality degree of a heralded state is reflected in its HOM visibility with a thermal field; our results establish a lower bound of 41.42% for the peak visibility, indicating the minimum assignable degree of nonclassicality to the heralded state. This research enhances our understanding of the HOM effect and its application to high-speed remote secret key sharing, addressing security concerns due to multiphoton contamination in heralded states.
UR - http://www.scopus.com/inward/record.url?scp=85180126470&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.131.233601
DO - 10.1103/PhysRevLett.131.233601
M3 - Article
AN - SCOPUS:85180126470
VL - 131
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 23
M1 - 233601
ER -