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
Quantum communication through spin chain dynamics: an introductory overview
TL;DR: A spin chain is a permanently coupled 1D system of spins as discussed by the authors, which can be used to connect quantum registers without resorting to optics, and it has been shown that it is possible to achieve perfect quantum state transfer through spin chains.
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Realization of the Einstein-Podolsky-Rosen Paradox Using Momentum- and Position-Entangled Photons from Spontaneous Parametric Down Conversion
TL;DR: A momentum-position realization of the EPR paradox is reported on using direct detection in the near and far fields of the photons emitted by collinear type-II phase-matched parametric down conversion to achieve a measured two-photon momentum- position variance product of 0.01 variant Planck's over 2pi (2).
Journal ArticleDOI
Quantum cryptography without switching.
Christian Weedbrook,Andrew M. Lance,Warwick P. Bowen,Thomas Symul,Timothy C. Ralph,Ping Koy Lam +5 more
TL;DR: A new coherent state quantum key distribution protocol that eliminates the need to randomly switch between measurement bases and offers the further advantage of simplicity compared to all previous protocols which, to date, have relied on switching.
Journal ArticleDOI
Nonmaximally Entangled States: Production, Characterization, and Utilization
TL;DR: In this article, a spontaneous down-conversion photon source was used to produce true nonmaximally entangled states, i.e., without the need for postselection, and the degree and phase of entanglement were readily tunable.
Journal ArticleDOI
A wavelength-tunable fiber-coupled source of narrowband entangled photons.
TL;DR: In this paper, a wavelength-tunable, fiber-coupled source of entangled photons with extremely high spectral brightness and quality of entanglement was demonstrated using a 25 mm PPKTP crystal inside a polarization Sagnac interferometer.