Continuous-variable quantum digital signatures over insecure channels

Secure quantum signatures using insecure quantum channels

Continuous-variable quantum key distribution protocols over noisy channels.

A continuous-variable quantum key distribution protocol based on squeezed states and heterodyne detection is introduced and shown to attain higher secret key rates over a noisy line than any other one-way Gaussian protocol. This increased resistance to channel noise can be understood as resulting from purposely adding noise to the signal that is converted into the secret key. This notion of noi...

Practical Human-Machine Identification over Insecure Channels

Human-machine identiication is an important problem in cryptography that has applications in network access, electronic commerce, and smart-card design. It is a hard problem largely because human users have a very limited capacity in memorizing secrets and in performing protocols. Therefore, in addition to the requirement that a human-machine identiication scheme must be provably secure, the sc...

Optimal working points for continuous-variable quantum channels

Imran Khan, 2 Christoffer Wittmann, 2 Nitin Jain, 2 Nathan Killoran, 4 Norbert Lütkenhaus, Christoph Marquardt, 2 and Gerd Leuchs 2 Max Planck Institute for the Science of Light, Guenther-Scharowsky-Str. 1/Bldg. 24, 91058 Erlangen Germany Institute for Optics, Information and Photonics, University of Erlangen-Nuernberg, Staudtstrae 7/B2, 91058 Erlangen, Germany Institute for Quantum Computing a...

Continuous-variable quantum key distribution in non-Markovian channels

Ruggero Vasile,1,* Stefano Olivares,2,3,4,† Matteo G. A. Paris,4,‡ and Sabrina Maniscalco5,1,§ 1Turku Centre for Quantum Physics, Department of Physics and Astronomy, University of Turku, FI-20014 Turun yliopisto, Finland 2Dipartimento di Fisica, Università degli Studi di Trieste, I-34151 Trieste, Italy 3CNISM, Unitá di Ricerca di Milano Università, I-20133 Milano, Italy 4Dipartimento di Fisica...