Entanglement-based quantum communication over 144 km

Ursin, Rupert; Tiefenbacher, F.; Schmitt-Manderbach, T.; Weier, Henning; Scheidl, Thomas; Lindenthal, M.; Blauensteiner, B.; Jennewein, Thomas; Perdigués, J.; Trojek, Pavel; Ömer, Bernhard; Fürst, Martin; Meyenburg, M.; Rarity, John; Sodnik, Zoran; Barbieri, C.; Weinfurter, Harald; Zeilinger, Anton

doi:10.1038/nphys629

Cited by 1,013 publications

(881 citation statements)

References 38 publications

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“…There is only one known practical situation of secure communication where only quantum solutions are favorable: the situation when wire communication is impossible but communication with photons can be done such as Zeilinger and coworkers' spatial quantum communication experiments mentioned above [15].…”

Section: Resultsmentioning

confidence: 99%

“…This process results in a significant bandwidth limitation. Zeilinger and coworkers have recently reported state-ofthe-art quantum communication with enhanced security, which requires entangled photon pairs, via the range of 144 km [15]. During a run of 75 second, they obtained 789 raw bits (coincidences) [15].…”

Section: Comments On the Speed Of Communicationmentioning

confidence: 99%

“…Zeilinger and coworkers have recently reported state-ofthe-art quantum communication with enhanced security, which requires entangled photon pairs, via the range of 144 km [15]. During a run of 75 second, they obtained 789 raw bits (coincidences) [15]. This is a speed of about 10 bit/second however their information leak with these bits is 4.8% and that is 25 times higher than that of the KLJN communicator (0.19%) at the given wire resistance.…”

Section: Comments On the Speed Of Communicationmentioning

confidence: 99%

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Johnson(-like)–Noise–Kirchhoff-loop based secure classical communicator characteristics, for ranges of two to two thousand kilometers, via model-line

2008

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Abstract.A pair of Kirchhoff-Loop-Johnson(-like)-Noise communicators, which is able to work over variable ranges, was designed and built. Tests have been carried out on a model-line performance characteristics were obtained for ranges beyond the ranges of any known direct quantum communication channel and they indicate unrivalled signal fidelity and security performance of the exchanged raw key bits. This simple device has single-wire secure key generation and sharing rates of 0.1, 1, 10, and 100 bit/second for corresponding copper wire diameters/ranges of 21 mm / 2000 km, 7 mm / 200 km, 2.3 mm / 20 km, and 0.7 mm / 2 km, respectively and it performs with 0.02% raw-bit error rate (99.98 % fidelity). The raw-bit security of this practical system significantly outperforms raw-bit quantum security. Current injection breaking tests show zero bit eavesdropping ability without triggering the alarm signal, therefore no multiple measurements are needed to build an error statistics to detect the eavesdropping as in quantum communication. Wire resistance based breaking tests of BergouScheuer-Yariv type give an upper limit of eavesdropped raw bit ratio of 0.19 % and this limit is inversely proportional to the sixth power of cable diameter. Hao's breaking method yields zero (below measurement resolution) eavesdropping information.Introduction.

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Section: Resultsmentioning

confidence: 99%

Section: Comments On the Speed Of Communicationmentioning

confidence: 99%

Section: Comments On the Speed Of Communicationmentioning

confidence: 99%

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Johnson(-like)–Noise–Kirchhoff-loop based secure classical communicator characteristics, for ranges of two to two thousand kilometers, via model-line

2008

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“…Firstly, in an open air experiment in the City of Vienna over a distance of 7.8 km the group [168] could violate a CHSH inequality (26) by more than 13 standard deviations. Secondly, this is presently the world record, the group [169] successfully carried out an open air Bell experiment over 144 km between the two Canary Islands La Palma and Tenerife.…”

Section: Third Generation Experiments Of the Nineties And Beyondmentioning

confidence: 99%

Bell’s Universe: A Personal Recollection

Bertlmann

2016

Quantum [Un]Speakables II

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My collaboration and friendship with John Bell is recollected. I will explain his outstanding contributions in particle physics, in accelerator physics, and his joint work with Mary Bell. Mary's work in accelerator physics is also summarized. I recall our quantum debates, mention some personal reminiscences, and give my personal view on Bell's fundamental work on quantum theory, in particular, on the concept of contextuality and nonlocality of quantum physics. Finally, I describe the huge influence Bell had on my own work, in particular on entanglement and Bell inequalities in particle physics and their experimental verification, and on mathematical physics, where some geometric aspects of the quantum states are illustrated.

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“…It is known that the system wavefunction, in general, cannot be factorized into a direct product of subsystem states due to the nature of quantum entanglement. This phenomenon, that does not appear in the classical theory, is under great attention due to its importance in various aspects of quantum information science, ranging from discrete to continuous variable quantum computation and communication [2,3,4,5]. Even more, being a correlational measure by nature, entanglement can be a crucial characteristic of QPTs [6,7].…”

Section: Introductionmentioning

confidence: 99%

Entanglement, magnetic and quadrupole moments properties of the mixed spin Ising–Heisenberg diamond chain

Abgaryan

Ananikian

Ananikyan

et al. 2015

Solid State Communications

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Thermal entanglement, magnetic and quadrupole moments properties of the mixed spin-1 2 and spin-1 Ising-Heisenberg model on a diamond chain are considered. Magnetization and quadrupole moment plateaus are observed for the antiferromagnetic couplings. Thermal negativity as a measure of quantum entanglement of the mixed spin system is calculated. Different behavior for the negativity is obtained for the various values of Heisenberg dipolar and quadrupole couplings. The intermediate plateau of the negativity has been observed at absence of the single-ion anisotropy and quadrupole interaction term. When dipolar and quadrupole couplings are equal there is a similar behavior of negativity and quadrupole moment.

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Entanglement-based quantum communication over 144 km

Cited by 1,013 publications

References 38 publications

Johnson(-like)–Noise–Kirchhoff-loop based secure classical communicator characteristics, for ranges of two to two thousand kilometers, via model-line

Johnson(-like)–Noise–Kirchhoff-loop based secure classical communicator characteristics, for ranges of two to two thousand kilometers, via model-line

Bell’s Universe: A Personal Recollection

Entanglement, magnetic and quadrupole moments properties of the mixed spin Ising–Heisenberg diamond chain

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