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Secure communication with single-photon two-qubit states

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons60291

Beige,  Almut
Laser Physics, Max Planck Institute of Quantum Optics, Max Planck Society;
Quantum Dynamics, Max Planck Institute of Quantum Optics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons60478

Englert,  Berthold-Georg
Laser Physics, Max Planck Institute of Quantum Optics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons60651

Kurtsiefer,  Christian
Laser Spectroscopy, Max Planck Institute of Quantum Optics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons60928

Weinfurter,  Harald
Laser Spectroscopy, Max Planck Institute of Quantum Optics, Max Planck Society;

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Zitation

Beige, A., Englert, B.-G., Kurtsiefer, C., & Weinfurter, H. (2002). Secure communication with single-photon two-qubit states. Journal of Physics A-Mathematical and General, 35(28), L407-L413. Retrieved from http://www.iop.org/EJ/S/0/27065/T0w.DBWQeJ1omxntm,GJEA/abstract/0305-4470/35/28/103.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-C1EF-C
Zusammenfassung
We propose a cryptographic scheme that is deterministic: Alice sends single photons to Bob, and each and every photon detected supplies one key bit-no photon is wasted. This is in marked contrast to other schemes in which a random process decides whether the next photon sent will contribute to the key or not. The determinism is achieved by preparing the photons in two- qubit states, rather than the one-qubit states used in conventional schemes. In particular, we consider the realistic situation in which one qubit is the photon polarization and the other a spatial alternative. Further, we show how one can exploit the deterministic nature for direct secure communication, that is without the need-for establishing A shared key first.