https://doi.org/10.1140/epjd/e2002-00172-5
Double entanglement and quantum cryptography*
Istituto Elettrotecnico Nazionale Galileo Ferraris, Str. delle Cacce 91,
10135 Torino, Italy
Corresponding author: a genovese@ien.it
Received:
23
July
2001
Revised:
30
November
2001
Published online:
24
September
2002
We propose a quantum transmission based on bi-photons, which are doubly-entangled both in polarisation and phase. This scheme finds a natural application in quantum cryptography, where we show that an eventual eavesdropper is bound to introduce a larger error on the quantum communication than for a single entangled bi-photon communication, when he steels the same information.
PACS: 03.67.Dd – Quantum cryptography / 03.67.Hk – Quantum communication / 42.79.-e – Optical elements, devices, and systems
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002