Quantum cryptography has several unorthodox attributes: it is invulnerable to passive eavesdropping; communicators need no initial shared secret (cryptographic key), but they do need an auxiliary tamper-proof link; the scheme requires an uninterrupted light path (no repeater), and a one-time pad of keystream must be prepared in advance of the secure transmission. At least two other cryptologic schemes share these same attributes. This is quite remarkable because each of the three schemes has an entirely different physical basis for its message secrecy. In quantum cryptography an eavesdropper cannot measure or clone the state of a photon without revealing the attempt to the authorized receiver. The second scheme is the Yuen–Kim protocol. Potential bits for the keystream are masked by classical noise. The eavesdropper cannot extract the same useful bits that the authorized receiver extracts because their receivers are statistically independent. Our own scheme, called QDRN, distributes broadband noisy light to terminals, where interferometers provide identical keystreams. Security presumes that there exists some bandwidth broad enough so that the eavesdropper cannot store the phase information either optically or digitally for some period like minutes, or even hours if necessary, after which the users may safely transmit data. The Yuen–Kim protocol is by far the simplest to implement. However, it is limited to point-to-point links and distances of some tens of kilometers. By contrast, QDRN operates with full power, is compatible with amplifiers and networks, and extends to hundreds of kilometers, quite possibly a megameter.
Quantum Information Processing – Springer Journals
Published: Oct 13, 2004
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera