Heralded-qubit amplifiers for practical device-independent quantum key distribution
Marcos Curty,Tobias Moroder +1 more
TL;DR: Full-mode analysis for both schemes confirms that, in contrast to recent beliefs, the second scheme can indeed provide a positive key rate which is even considerably higher than that of the first alternative, and strongly depend on the underlying security proof.
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Abstract: Device-independent quantum key distribution does not need a precise quantum mechanical model of employed devices to guarantee security. Despite its beauty, it is still a very challenging experimental task. We compare a recent proposal by Gisin et al. [Phys. Rev. Lett. 105, 070501 (2010)] to close the detection loophole problem with that of a simpler quantum relay based on entanglement swapping with linear optics. Our full-mode analysis for both schemes confirms that, in contrast to recent beliefs, the second scheme can indeed provide a positive key rate which is even considerably higher than that of the first alternative. The resulting key rates and required detection efficiencies of approximately 95% for both schemes, however, strongly depend on the underlying security proof.
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Citations
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TL;DR: In this paper, a theorem of Bell, proving that certain predictions of quantum mechanics are inconsistent with the entire family of local hidden-variable theories, is generalized so as to apply to realizable experiments.
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Device-independent security of quantum cryptography against collective attacks.
TL;DR: The main result is a tight bound on the Holevo information between one of the authorized parties and the eavesdropper, as a function of the amount of violation of a Bell-type inequality.
Hacking commercial quantum cryptography systems by tailored bright illumination
Lars Lydersen,Lars Lydersen,Carlos Wiechers,Carlos Wiechers,Carlos Wiechers,Christoffer Wittmann,Dominique Elser,Johannes Skaar,Johannes Skaar,Vadim Makarov +9 more
TL;DR: By using bright pulses of light to ‘blind’ the avalanche photodiode detectors used in quantum cryptography equipment, scientists in Europe have shown that it is possible to tracelessly steal the secret encryption key generated by such systems and thus compromise their security.
Counting near-infrared single-photons with 95% efficiency
TL;DR: The fabrication and evaluation of a fiber-coupled, photon-number-resolving TES detector optimized for absorption at 1550 and 1310 nm wavelengths is described, which to the authors' knowledge is the highest system detection efficiency reported for a near-infrared single-photon detector.
From Bell's Theorem to Secure Quantum Key Distribution
TL;DR: A new QKD protocol is introduced and its security against any individual attack by an adversary only limited by the no-signaling condition is proved.