Entangled photons on demand: Erasing which-path information with sidebands

2009 ◽  
Vol 80 (24) ◽  
Author(s):  
W. A. Coish ◽  
J. M. Gambetta
Keyword(s):  
Entangled Photons ◽  
On Demand ◽  
Path Information

scholarly journals Understanding ghost interference

2016 ◽  
Vol 14 (06) ◽  
pp. 1640036 ◽  
Author(s):  
Tabish Qureshi ◽  
Pravabati Chingangbam ◽  
Sheeba Shafaq
Keyword(s):  
Wave Packet ◽  
Combined Effect ◽  
The Other ◽  
Entangled Photons ◽  
Path Information ◽  
Wave Packet Dynamics ◽  
Fringe Width ◽  
Different Color ◽  
Quantum Erasure ◽  
Double Slit

The ghost interference observed for entangled photons is theoretically analyzed using wave-packet dynamics. It is shown that ghost interference is a combined effect of virtual double-slit creation due to entanglement, and quantum erasure of which-path information for the interfering photon. For the case where the two photons are of different color, it is shown that fringe width of the interfering photon depends not only on its own wavelength, but also on the wavelength of the other photon which it is entangled with.

On-demand generation of entangled photons in the telecom C-band

2020 ◽  
Author(s):  
Katharina D. Zeuner ◽  
Klaus D. Jöns ◽  
Lucas Schweickert ◽  
Carl Reuterskiöld Hedlund ◽  
Carlos Nunez Lobato ◽  
...  
Keyword(s):  
Entangled Photons ◽  
On Demand

scholarly journals On-Demand Semiconductor Source of Entangled Photons Which Simultaneously Has High Fidelity, Efficiency, and Indistinguishability

2019 ◽  
Vol 122 (11) ◽  
Author(s):  
Hui Wang ◽  
Hai Hu ◽  
T.-H. Chung ◽  
Jian Qin ◽  
Xiaoxia Yang ◽  
...  
Keyword(s):  
High Fidelity ◽  
Entangled Photons ◽  
On Demand

scholarly journals Quantum key distribution with entangled photons generated on demand by a quantum dot

2021 ◽  
Vol 7 (12) ◽  
pp. eabe6379
Author(s):  
Francesco Basso Basset ◽  
Mauro Valeri ◽  
Emanuele Roccia ◽  
Valerio Muredda ◽  
Davide Poderini ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Key Distribution ◽  
Real Life ◽  
Single Mode ◽  
Key Distribution ◽  
Single Mode Fiber ◽  
Entangled Photons ◽  
Secret Key ◽  
Quantum Networks ◽  
On Demand

Quantum key distribution—exchanging a random secret key relying on a quantum mechanical resource—is the core feature of secure quantum networks. Entanglement-based protocols offer additional layers of security and scale favorably with quantum repeaters, but the stringent requirements set on the photon source have made their use situational so far. Semiconductor-based quantum emitters are a promising solution in this scenario, ensuring on-demand generation of near-unity-fidelity entangled photons with record-low multiphoton emission, the latter feature countering some of the best eavesdropping attacks. Here, we use a coherently driven quantum dot to experimentally demonstrate a modified Ekert quantum key distribution protocol with two quantum channel approaches: both a 250-m-long single-mode fiber and in free space, connecting two buildings within the campus of Sapienza University in Rome. Our field study highlights that quantum-dot entangled photon sources are ready to go beyond laboratory experiments, thus opening the way to real-life quantum communication.

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