Quantum Communication Protocols, such as Quantum Key Distribution, are typically described in the language of abstract qubits. For implementations, on the other hand, we use light pulses where the signals are described as elements of the infinite dimensional Hilbert space of optical modes. In this contribution I discuss how those two pictures fit together, especially in a cryptographic scenario.
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
Tel.: +1 703 830 6300
Fax: +1 703 830 2300 email@example.com
(Corporate matters and books only) IOS Press c/o Accucoms US, Inc.
For North America Sales and Customer Service
West Point Commons
Lansdale PA 19446
Tel.: +1 866 855 8967
Fax: +1 215 660 5042 firstname.lastname@example.org