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14 results on '"Weier, Henning"'

1. A high-brightness source of polarization-entangled photons optimized for applications in free space

Author

Steinlechner, Fabian, Trojek, Pavel, Jofre, Marc, Weier, Henning, Perez, Daniel, Jennewein, Thomas, Ursin, Rupert, Rarity, John, Mitchell, Morgan W., Torres, Juan P., Weinfurter, Harald, and Pruneri, Valerio

Subjects
Quantum Physics
Abstract

We present a simple but highly efficient source of polarization-entangled photons based on spontaneous parametric down-conversion (SPDC) in bulk periodically poled potassium titanyl phosphate crystals (PPKTP) pumped by a 405 nm laser diode. Utilizing one of the highest available nonlinear coefficients in a non-degenerate, collinear type-0 phase-matching configuration, we generate polarization entanglement via the crossed-crystal scheme and detect 0.64 million photon pair events/s/mW, while maintaining an overlap fidelity with the ideal Bell state of 0.98 at a pump power of 0.025 mW.

Published
2012
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2. Quantum Eavesdropping without Interception: An Attack Exploiting the Dead Time of Single Photon Detectors

Author

Weier, Henning, Krauss, Harald, Rau, Markus, Fuerst, Martin, Nauerth, Sebastian, and Weinfurter, Harald

Subjects
Quantum Physics
Abstract

The security of quantum key distribution (QKD) can easily be obscured if the eavesdropper can utilize technical imperfections of the actual implementation. Here we describe and experimentally demonstrate a very simple but highly effective attack which even does not need to intercept the quantum channel at all. Only by exploiting the dead time effect of single photon detectors the eavesdropper is able to gain (asymptotically) full information about the generated keys without being detected by state-of-the-art QKD protocols. In our experiment, the eavesdropper inferred up to 98.8% of the key correctly, without increasing the bit error rate between Alice and Bob significantly. Yet, we find an evenly simple and effective countermeasure to inhibit this and similar attacks.

Published
2011
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3. QIPS: quantum information and quantum physics in space

Author

Schmitt-Manderbach, Tobias, primary, Scheidl, Thomas, additional, Ursin, Rupert, additional, Tiefenbacher, Felix, additional, Weier, Henning, additional, Fürst, Martin, additional, Jennewein, T., additional, Perdigues, J., additional, Sodnik, Z., additional, Rarity, J., additional, Zeilinger, Anton, additional, and Weinfurter, Harald, additional

Published
2017
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5. Quantum key distribution using quantum dot single-photon emitting diodes in the red and near infrared spectral range

Author

Heindel, Tobias, Kessler, Christian A., Rau, Markus, Schneider, Christian, Fuerst, Martin, Hargart, Fabian, Schulz, Wolfgang-Michael, Eichfelder, Marcus, Rossbach, Robert, Nauerth, Sebastian, Lermer, Matthias, Weier, Henning, Jetter, Michael, Kamp, Martin, Reitzenstein, Stephan, Höfling, Sven, Michler, Peter, Weinfurter, Harald, Forchel, Alfred, University of St Andrews. School of Physics and Astronomy, and University of St Andrews. Condensed Matter Physics

Subjects
Secure communication, Cryptography, Quantum key distribution (QKD)
Abstract

We report on in-lab free space quantum key distribution (QKD) experiments over 40 cm distance using highly efficient electrically driven quantum dot single-photon sources emitting in the red as well as near-infrared spectral range. In the case of infrared emitting devices, we achieve sifted key rates of 27.2 kbit s(-1)(35.4 kbit s(-1)) at a quantum bit error rate (QBER) of 3.9% (3.8%) and a g((2))(0) value of 0.35 (0.49) at moderate (high) excitation. The red emitting diodes generate sifted keys at a rate of 95.0 kbit s(-1) at a QBER of 4.1% and a g((2))(0) value of 0.49. This first successful proof of principle QKD experiment based on electrically operated semiconductor single-photon sources can be considered as a major step toward practical and efficient quantum cryptography scenarios. Publisher PDF

Published
2012

9. Quantum key distribution using quantum dot single-photon emitting diodes in the red and near infrared spectral range

Author

Heindel, Tobias, primary, Kessler, Christian A, additional, Rau, Markus, additional, Schneider, Christian, additional, Fürst, Martin, additional, Hargart, Fabian, additional, Schulz, Wolfgang-Michael, additional, Eichfelder, Marcus, additional, Roßbach, Robert, additional, Nauerth, Sebastian, additional, Lermer, Matthias, additional, Weier, Henning, additional, Jetter, Michael, additional, Kamp, Martin, additional, Reitzenstein, Stephan, additional, Höfling, Sven, additional, Michler, Peter, additional, Weinfurter, Harald, additional, and Forchel, Alfred, additional

Published
2012
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10. A high-brightness source of polarization-entangled photons optimized for applications in free space

Author

Steinlechner, Fabian, primary, Trojek, Pavel, additional, Jofre, Marc, additional, Weier, Henning, additional, Perez, Daniel, additional, Jennewein, Thomas, additional, Ursin, Rupert, additional, Rarity, John, additional, Mitchell, Morgan W., additional, Torres, Juan P., additional, Weinfurter, Harald, additional, and Pruneri, Valerio, additional

Published
2012
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14. Experimental Demonstration of Free-Space Decoy-State Quantum Key Distribution over 144 km

Author

Schmitt-Manderbach, Tobias, primary, Weier, Henning, additional, Fürst, Martin, additional, Ursin, Rupert, additional, Tiefenbacher, Felix, additional, Scheidl, Thomas, additional, Perdigues, Josep, additional, Sodnik, Zoran, additional, Kurtsiefer, Christian, additional, Rarity, John G., additional, Zeilinger, Anton, additional, and Weinfurter, Harald, additional

Published
2007
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