Journal ArticleDOI
Quantum cryptography based on Bell's theorem.
TLDR
Practical application of the generalized Bells theorem in the so-called key distribution process in cryptography is reported, based on the Bohms version of the Einstein-Podolsky-Rosen gedanken experiment andBells theorem is used to test for eavesdropping.Abstract:
Practical application of the generalized Bells theorem in the so-called key distribution process in cryptography is reported. The proposed scheme is based on the Bohms version of the Einstein-Podolsky-Rosen gedanken experiment and Bells theorem is used to test for eavesdropping. © 1991 The American Physical Society.read more
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Journal ArticleDOI
Narrow band source of transform-limited photon pairs via four-wave mixing in a cold atomic ensemble.
Bharath Srivathsan,Gurpreet Kaur Gulati,Brenda Chng,Gleb Maslennikov,Dzmitry Matsukevich,Christian Kurtsiefer +5 more
TL;DR: Narrow band pairs of time-correlated photons from nondegenerate four-wave mixing in a laser-cooled atomic ensemble of ^{87}Rb using a cascade decay scheme are observed, indicating a transform-limited spectrum of the photon pairs.
Journal ArticleDOI
Phase encoding schemes for measurement-device-independent quantum key distribution with basis-dependent flaw
TL;DR: This work proposes two schemes for the phase encoding, the first one employs a phase locking technique with the use of non-phase-randomized coherent pulses, and the second one uses conversion of standard BB84 phase encoding pulses into polarization modes and proves the unconditional security of these schemes.
Journal ArticleDOI
A de Finetti representation for finite symmetric quantum states
Robert König,Renato Renner +1 more
TL;DR: In this article, the authors generalize the de Finetti representation to the case of finite symmetric quantum states and show that, conditioned on the outcomes of an informationally complete measurement applied to a number of subsystems, the remaining subsystems are close to having product form.
Journal ArticleDOI
Three-step three-party quantum secure direct communication
TL;DR: A three-party quantum secure direct communication (QSDC) protocol with hyperentanglement in both spatial-mode and polarization degrees of freedom, which has a higher information capacity than other protocols.
Journal ArticleDOI
Theory of channel simulation and bounds for private communication
Stefano Pirandola,Samuel L. Braunstein,Riccardo Laurenza,Carlo Ottaviani,Thomas P. W. Cope,Gaetana Spedalieri,Gaetana Spedalieri,Leonardo Banchi,Leonardo Banchi +8 more
TL;DR: In this article, a general weak converse bound for private communication based on the relative entropy of entanglement is proposed, and the authors provide a rigorous proof of the strong converse property of these bounds by adopting a correct use of the Braunstein-Kimble teleportation protocol for the simulation of bosonic Gaussian channels.