Quantum key distribution with localized photons

Information is usually extracted from a photon when a photodetector clicks. On the other hand, a single particle encloses part of the information it is carrying in its wavefunction which is usually lost in a single click. The wavefunction shape may be recovered reconstructing it with many detections, but there is no way to reconstruct it with a single detector’s click….

….in all but one case : when the wavefunction is localized.

If a photon wavefunction is localized the click on the detector also pinpoints the photon location so that much more information may be extracted.


In a recently published paper we demonstrate how to exploit this additional information in an optical fiber supporting transverse localization. Moreover by exploiting position and momentum complementarity we are able to encrypt information with a quantum key distribution protocol.




Inserisci i tuoi dati qui sotto o clicca su un'icona per effettuare l'accesso:

Logo WordPress.com

Stai commentando usando il tuo account WordPress.com. Chiudi sessione /  Modifica )

Google+ photo

Stai commentando usando il tuo account Google+. Chiudi sessione /  Modifica )

Foto Twitter

Stai commentando usando il tuo account Twitter. Chiudi sessione /  Modifica )

Foto di Facebook

Stai commentando usando il tuo account Facebook. Chiudi sessione /  Modifica )

Connessione a %s...