Details
| Original language | English |
|---|---|
| Pages (from-to) | 34-40 |
| Number of pages | 7 |
| Journal | OPTICA |
| Volume | 6 |
| Issue number | 1 |
| Publication status | Published - 4 Jan 2019 |
| Externally published | Yes |
Abstract
Keywords
- Magnetic fields, Parametric down conversion, Photon polarization, Photons, Quantum information processing, Quantum optics
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: OPTICA, Vol. 6, No. 1, 04.01.2019, p. 34-40.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Polarization-entangled photon pairs from a single molecule
AU - Rezai, Mohammad
AU - Wrachtrup, Jörg
AU - Gerhardt, Ilja
N1 - © 2019 Optical Society of America
PY - 2019/1/4
Y1 - 2019/1/4
N2 - Photonic entanglement is one of the key resources in modern quantum optics. It opens the door to schemes such as quantum communication, quantum teleportation, and quantum-enhanced precision sensing. Sources based on parametric down-conversion or cascaded decays in atomic and atom-like emitters are limited because of their weak interaction with stationary qubits. This is due to their commonly broadband emission. Furthermore, these sources are commonly in the near-infrared such that quantum emitters in the blue spectral region, such as ions or many defect centers, cannot be addressed. Here, we present a sodium-resonant (589.0nm) and narrow-band (14MHz) degenerate entanglement source based on a single molecule. A beam-splitter renders two independently emitted photons into a polarization-entangled state. The quality of the entangled photon pairs is verified by the violation of Bell's inequality. We measure a Bell parameter of S=2.26+/-0.05. This attests that the detected photon pairs exceed the classical limit; it is reconfirmed by quantum-state tomography and an analysis of the raw detector counts, which result in a value of S=2.24+/-0.12. The tomography shows fidelity of 82% to a maximally entangled Bell state. This work opens the route to background-free solid-state entanglement sources which surpass the probabilistic nature of the commonly used sources and are free from unwanted multi-photon events. The source is ideal for combination with stationary qubits such as atoms, ions, quantum dots, or defect centers.
AB - Photonic entanglement is one of the key resources in modern quantum optics. It opens the door to schemes such as quantum communication, quantum teleportation, and quantum-enhanced precision sensing. Sources based on parametric down-conversion or cascaded decays in atomic and atom-like emitters are limited because of their weak interaction with stationary qubits. This is due to their commonly broadband emission. Furthermore, these sources are commonly in the near-infrared such that quantum emitters in the blue spectral region, such as ions or many defect centers, cannot be addressed. Here, we present a sodium-resonant (589.0nm) and narrow-band (14MHz) degenerate entanglement source based on a single molecule. A beam-splitter renders two independently emitted photons into a polarization-entangled state. The quality of the entangled photon pairs is verified by the violation of Bell's inequality. We measure a Bell parameter of S=2.26+/-0.05. This attests that the detected photon pairs exceed the classical limit; it is reconfirmed by quantum-state tomography and an analysis of the raw detector counts, which result in a value of S=2.24+/-0.12. The tomography shows fidelity of 82% to a maximally entangled Bell state. This work opens the route to background-free solid-state entanglement sources which surpass the probabilistic nature of the commonly used sources and are free from unwanted multi-photon events. The source is ideal for combination with stationary qubits such as atoms, ions, quantum dots, or defect centers.
KW - Magnetic fields
KW - Parametric down conversion
KW - Photon polarization
KW - Photons
KW - Quantum information processing
KW - Quantum optics
UR - http://www.scopus.com/inward/record.url?scp=85060723790&partnerID=8YFLogxK
U2 - 10.1364/OPTICA.6.000034
DO - 10.1364/OPTICA.6.000034
M3 - Article
VL - 6
SP - 34
EP - 40
JO - OPTICA
JF - OPTICA
SN - 2334-2536
IS - 1
ER -