dorsal/arxiv
View SchemaJoint Spectrum Mapping of Polarization Entanglement in Spontaneous Parametric Down-conversion
| Authors | Hou Shun Poh, Chune Yang Lum, Ivan Marcikic, Antia Lamas-Linares, Christian Kurtsiefer |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0608009 |
| URL | https://arxiv.org/abs/quant-ph/0608009 |
| DOI | 10.1103/PhysRevA.75.043816 |
| Journal | Phys. Rev. A 75, 043816 (2007) |
Abstract
Polarization-entangled photon pairs can be efficiently prepared into pure Bell states with a high fidelity via type-II spontaneous parametric down-conversion (SPDC) of narrow-band pump light. However, the use of femtosecond pump pulses to generate multi-photon states with precise timing often requires spectral filtering to maintain a high quality of polarization entanglement. This typically reduces the efficiency of photon pair collection. We experimentally map the polarization correlations of photon pairs from such a source over a range of down-converted wavelengths with a high spectral resolution and find strong polarization correlations everywhere. A spectrally dependent imbalance between contributions from the two possible decay paths of SPDC is identified as the reason for a reduction in entanglement quality observed with femtosecond pump pulses. Our spectral measurements allow to predict the polarization correlations for arbitrary filter profiles when the frequency degree of freedom of the photon pairs is ignored.
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"abstract": "Polarization-entangled photon pairs can be efficiently prepared into pure\nBell states with a high fidelity via type-II spontaneous parametric\ndown-conversion (SPDC) of narrow-band pump light. However, the use of\nfemtosecond pump pulses to generate multi-photon states with precise timing\noften requires spectral filtering to maintain a high quality of polarization\nentanglement. This typically reduces the efficiency of photon pair collection.\nWe experimentally map the polarization correlations of photon pairs from such a\nsource over a range of down-converted wavelengths with a high spectral\nresolution and find strong polarization correlations everywhere. A spectrally\ndependent imbalance between contributions from the two possible decay paths of\nSPDC is identified as the reason for a reduction in entanglement quality\nobserved with femtosecond pump pulses. Our spectral measurements allow to\npredict the polarization correlations for arbitrary filter profiles when the\nfrequency degree of freedom of the photon pairs is ignored.",
"arxiv_id": "quant-ph/0608009",
"authors": [
"Hou Shun Poh",
"Chune Yang Lum",
"Ivan Marcikic",
"Antia Lamas-Linares",
"Christian Kurtsiefer"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.75.043816",
"journal_ref": "Phys. Rev. A 75, 043816 (2007)",
"title": "Joint Spectrum Mapping of Polarization Entanglement in Spontaneous Parametric Down-conversion",
"url": "https://arxiv.org/abs/quant-ph/0608009"
},
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