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Overcoming the rate–distance limit of quantum key distribution without quantum repeaters

This work introduces an alternative scheme for QKD whereby pairs of phase-randomized optical fields are first generated at two distant locations and then combined at a central measuring station, enabling a form of quantum key distribution that can exceed the secret-key capacity without using quantum repeaters and that has security independent of the measuring devices.
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Quantum key distribution over 122 km of standard telecom fiber

We report a demonstration of quantum key distribution over a standard telecom fiber exceeding 100 km in length. Through careful optimization of the interferometer and single photon detector, we…
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Field test of quantum key distribution in the Tokyo QKD Network.

Two GHz-clocked QKD links enable the world-first secure TV conferencing over a distance of 45km to be demonstrated and detection of an eavesdropper, rerouting into a secure path, and key relay via trusted nodes are demonstrated in this network.
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The SECOQC quantum key distribution network in Vienna

The paper presents the architecture and functionality of the principal networking agent—the SECOQC node module, which enables the authentic classical communication required for key distillation, manages the generated key material, determines a communication path between any destinations in the network, and realizes end-to-end secure transport of key material between these destinations.
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10-Mb/s Quantum Key Distribution

The first quantum-key-distribution (QKD) systems capable of delivering sustainable, real-time secure keys continuously at rates exceeding 10 Mb/s are reported, and the robustness and long-term stability on a second QKD system continuously running for 1 month without any user invention is confirmed.
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Semiconductor quantum light sources

Lasers and LEDs have a statistical distribution in the number of photons emitted within a given time interval. Applications exploiting the quantum properties of light require sources for which either…
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A semiconductor source of triggered entangled photon pairs

This work demonstrates triggered photon pair emission from single quantum dots suggestive of polarization entanglement by tuning the splitting to zero, and suggests that a triggered entangled photon pair source could be implemented by a simple semiconductor light-emitting diode.
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An entangled-light-emitting diode

The realization of an electrically driven source of entangled photon pairs, consisting of a quantum dot embedded in a semiconductor light-emitting diode (LED) structure, shows its potential function as an on-demand source without the need for a complicated laser driving system, and is at present the best source on which to base future scalable quantum information applications.
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Coexistence of High-Bit-Rate Quantum Key Distribution and Data on Optical Fiber

This work exploits a novel temporal-filtering effect for noisephoton rejection that allows high-bit-rate QKD over fibers up to 90 km in length and populated with error-free bidirectional Gb=s data communications.
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Quantum key distribution for 10 Gb/s dense wavelength division multiplexing networks

We demonstrate quantum key distribution (QKD) with bidirectional 10 Gb/s classical data channels in a single fiber using dense wavelength division multiplexing. Record secure key rates of 2.38 Mbps…
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