Abstract
We examine experimentally how the degree of position-momentum entanglement of photon pairs depends on the transverse coherence of the pump beam that excites them in a process of spontaneous parametric down-conversion. Using spatially incoherent light from a light-emitting diode, we obtain strong position correlation of the photons, but we find that transverse momentum correlation, and thus entanglement, is entirely absent. When we continuously vary the degree of spatial coherence on the pump beam, we observe the emergence of stronger momentum correlations and entanglement. We present theoretical arguments that explain our experimental results. Our results shed light on entanglement generation and can be applied to control entanglement for quantum information applications.
| Original language | English |
|---|---|
| Pages (from-to) | 20745-20753 |
| Number of pages | 9 |
| Journal | Optics Express |
| Volume | 27 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - 22 Jul 2019 |
| Publication type | A1 Journal article-refereed |
Funding
Canada First Research Excellence Fund award on Transformative Quantum Technologies (CFREF); China Scholarship Council (CSC) (201706310083); Fundamental Research Funds for the Central Universities at Xiamen University (20720190054, 20720190057); New Century Excellent Talents in University of China (NCET) (13-0495); National Natural Science Foundation of China (NSFC) (91636109); Natural Science Foundation of Fujian Province of China for Distinguished Young Scientists (2015J06002); Natural Sciences and Engineering Council of Canada (NSERC)
Publication forum classification
- Publication forum level 1
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
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