scholarly journals Long-distance distribution of time-bin entangled photon pairs over 100 km using frequency up-conversion detectors

2007 ◽  
Vol 15 (21) ◽  
pp. 13957 ◽  
Author(s):  
T. Honjo ◽  
H. Takesue ◽  
H. Kamada ◽  
Y. Nishida ◽  
O. Tadanaga ◽  
...  
Keyword(s):  
Distance Distribution ◽  
Long Distance ◽  
Photon Pairs ◽  
Entangled Photon Pairs

scholarly journals Passively stable distribution of polarisation entanglement over 192 km of deployed optical fibre

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Sören Wengerowsky ◽  
Siddarth Koduru Joshi ◽  
Fabian Steinlechner ◽  
Julien R. Zichi ◽  
Bo Liu ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Stable Distribution ◽  
Dispersion Compensation ◽  
Chromatic Dispersion ◽  
Bell State ◽  
Long Distance ◽  
Quantum Networks ◽  
Two Photon ◽  
Photon Pairs ◽  
Entangled Photon Pairs

AbstractQuantum key distribution (QKD) based on entangled photon pairs holds the potential for repeater-based quantum networks connecting clients over long distance. We demonstrate long-distance entanglement distribution by means of polarisation-entangled photon pairs through two successive deployed 96 km-long telecommunications fibres in the same submarine cable. One photon of each pair was detected directly after the source, while the other travelled the fibre cable in both directions for a total distance of 192 km and attenuation of 48 dB. The observed two-photon Bell state exhibited a fidelity 85 ± 2% and was stable over several hours. We employed neither active stabilisation of the quantum state nor chromatic dispersion compensation for the fibre.

A Quantum Repeater Based on Entanglement Purification and Entanglement Swapping

2013 ◽  
Vol 302 ◽  
pp. 607-611
Author(s):  
Zhen Zhu Zhou ◽  
Wei He ◽  
Chun Dan Zhu ◽  
Ying Wang
Keyword(s):  
Quantum Communication ◽  
Entanglement Swapping ◽  
High Fidelity ◽  
Quantum Repeater ◽  
Long Distance ◽  
Entanglement Purification ◽  
Photon Pairs ◽  
The Common ◽  
Entangled Photon Pairs ◽  
Epr Pair

We discuss a long-distance quantum communication system based on entangled photon pairs, which apply entanglement as its fundamental resource. For distances longer than the coherence length of a counterpart noisy quantum channel, the fidelity of transmission is ordinarily so low that standard purification processes are not applicable. The quantum repeater stretches the length of the entangled photon pairs. And the high fidelity entanglement of photons between sender and receiver is obtained by entanglement purification and entanglement swapping. We compare the nested repeater with the common repeater and show that it outperforms the latter, which is built an EPR pair in less time.

scholarly journals Entanglement distribution over a 96-km-long submarine optical fiber

2019 ◽  
Vol 116 (14) ◽  
pp. 6684-6688 ◽  
Author(s):  
Sören Wengerowsky ◽  
Siddarth Koduru Joshi ◽  
Fabian Steinlechner ◽  
Julien R. Zichi ◽  
Sergiy M. Dobrovolskiy ◽  
...  
Keyword(s):  
Quantum Physics ◽  
Information Science ◽  
Global Scale ◽  
Great Promise ◽  
Quantum Repeater ◽  
Long Distance ◽  
Optical Telecommunications ◽  
Photon Pairs ◽  
Telecommunications Network ◽  
Entangled Photon Pairs

Quantum entanglement is one of the most extraordinary effects in quantum physics, with many applications in the emerging field of quantum information science. In particular, it provides the foundation for quantum key distribution (QKD), which promises a conceptual leap in information security. Entanglement-based QKD holds great promise for future applications owing to the possibility of device-independent security and the potential of establishing global-scale quantum repeater networks. While other approaches to QKD have already reached the level of maturity required for operation in absence of typical laboratory infrastructure, comparable field demonstrations of entanglement-based QKD have not been performed so far. Here, we report on the successful distribution of polarization-entangled photon pairs between Malta and Sicily over 96 km of submarine optical telecommunications fiber. We observe around 257 photon pairs per second, with a polarization visibility above 90%. Our results show that QKD based on polarization entanglement is now indeed viable in long-distance fiber links. This field demonstration marks the longest-distance distribution of entanglement in a deployed telecommunications network and demonstrates an international submarine quantum communication channel. This opens up myriad possibilities for future experiments and technological applications using existing infrastructure.

Progress Toward Generation of Spatially-Entangled Photon Pairs in a Few-Mode Fiber

2020 ◽  
Author(s):  
Afshin Shamsshooli ◽  
Cheng Guo ◽  
Michael Vasilyev ◽  
Francesca Parmigiani ◽  
Xiaoying Li
Keyword(s):  
Photon Pairs ◽  
Entangled Photon Pairs

scholarly journals Engineering entangled photon pairs with metal–organic frameworks

2021 ◽  
Author(s):  
Rubén A. Fritz ◽  
Yamil J. Colón ◽  
Felipe Herrera
Keyword(s):  
Frequency Conversion ◽  
Metal Organic Frameworks ◽  
Optical Frequency ◽  
New Materials ◽  
Optical Frequency Conversion ◽  
Photon Pairs ◽  
Metal Organic ◽  
Entangled Photon Pairs ◽  
Conversion Efficiencies

The discovery and design of new materials with competitive optical frequency conversion efficiencies can accelerate the development of scalable photonic quantum technologies.

Generation and detection of magnified images via illumination by entangled photon pairs

2005 ◽  
Vol 72 (3) ◽  
Author(s):  
Ivan F. Santos ◽  
Leonardo Neves ◽  
G. Lima ◽  
C. H. Monken ◽  
S. Pádua
Keyword(s):  
Photon Pairs ◽  
Entangled Photon Pairs

scholarly journals Entangled photon pairs from the optical decay of biexcitons

1999 ◽  
Vol 111 (9) ◽  
pp. 495-500 ◽  
Author(s):  
S Savasta ◽  
G Martino ◽  
R Girlanda
Keyword(s):  
Photon Pairs ◽  
Entangled Photon Pairs

scholarly journals Entangled Photon Pairs Produced by a Quantum Dot Strongly Coupled to a Microcavity

2008 ◽  
Vol 100 (24) ◽  
Author(s):  
R. Johne ◽  
N. A Gippius ◽  
G. Pavlovic ◽  
D. D. Solnyshkov ◽  
I. A. Shelykh ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Strongly Coupled ◽  
Photon Pairs ◽  
Entangled Photon Pairs
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