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926 results on '"Rarity, John"'

104. Conformal CVD-Grown MoS2 on Three-Dimensional Woodpile Photonic Crystals for Photonic Bandgap Engineering

Author

Taverne, Mike P. C., primary, Zheng, Xu, additional, Chen, Yu-Shao Jacky, additional, Morgan, Katrina A., additional, Chen, Lifeng, additional, Palakkool, Nadira Meethale, additional, Rezaie, Daniel, additional, Awachi, Habib, additional, Rarity, John G., additional, Hewak, Daniel W., additional, Huang, Chung-Che, additional, and Ho, Ying-Lung Daniel, additional

Published
2023
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110. Hiding images in noise

Author

Johnson, Steven, primary, McMillan, Alex, additional, Frick, Stefan, additional, Rarity, John, additional, and Padgett, Miles, additional

Published
2023
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112. Entanglement distribution quantum networking within deployed telecommunications fibre-optic infrastructure

Author

Clark, Marcus J., primary, Alia, Obada, additional, Wang, Rui, additional, Bahrani, Sima, additional, Peranic, Matej, additional, Aktas, Djeylan, additional, Kanellos, George T., additional, Loncaric, Martin, additional, Samec, Zeljko, additional, Radman, Anton, additional, Stipcevic, Mario, additional, Nejabati, Reza, additional, Simeonidou, Dimitra, additional, Rarity, John G., additional, and Joshi, Siddarth K., additional

Published
2023
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114. Single photon sources and applications

Author

Rarity, John G., Kitson, Stephen C., Tapster, Paul R., Beig, R., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Ojima, I., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Benisty, Henri, editor, Weisbuch, Claude, editor, Polytechnique, École, editor, Gérard, Jean-Michel, editor, Houdré, Romuald, editor, and Rarity, John, editor

Published
1999
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115. Enhancing methane sensors by sensing without detection

Author

Cardoso, Arthur C., Zhou, Haichen, Joshi, Siddarth K., and Rarity, John G.

Subjects
Quantum Physics, FOS: Physical sciences, Quantum Physics (quant-ph), Optics (physics.optics), Physics - Optics
Abstract

We propose a novel methane sensor based on sensing without detection. First used in quantum imaging, this technique relies on the interference effects seen in three wave mixing when pump signal and idler modes make a double pass through a nonlinear crystal. The method allows sensing at wavelengths where detectors are poor and detecting at wavelengths where photon counting sensitivity can be achieved. This compact interferometer, potentially set in a portable device for field operations, could allow the detection of low concentrations of methane at up to 100m range. Signal-to-noise ratio calculations point out that the method's sensitivity can overcome the integrated path differential absorption direct sensing at high non-linear gain regimes., 9 pages 4 figures

Published
2022

116. Unconditionally secure digital signatures implemented in an eight-user quantum network*

Author

Pelet, Yoann, primary, Puthoor, Ittoop Vergheese, additional, Venkatachalam, Natarajan, additional, Wengerowsky, Sören, additional, Lončarić, Martin, additional, Neumann, Sebastian Philipp, additional, Liu, Bo, additional, Samec, Željko, additional, Stipčević, Mario, additional, Ursin, Rupert, additional, Andersson, Erika, additional, Rarity, John G, additional, Aktas, Djeylan, additional, and Joshi, Siddarth Koduru, additional

Published
2022
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118. Exchange-Free Polarimetry of a Polarising Object

Author

Hance, Jonte R and Rarity, John G

Subjects
QETLabs, Bristol Quantum Information Institute
Abstract

We extend exchange-free imaging to polarimetry of a polarising object. This allows imaging of these samples with far less absorbed energy - a key concern when imaging with high-frequency radiation.

Published
2022

123. Scalable Authentication and Optimal Flooding in a Quantum Network

Author

Solomons, Naomi R., primary, Fletcher, Alasdair I., additional, Aktas, Djeylan, additional, Venkatachalam, Natarajan, additional, Wengerowsky, Sören, additional, Lončarić, Martin, additional, Neumann, Sebastian P., additional, Liu, Bo, additional, Samec, Željko, additional, Stipčević, Mario, additional, Ursin, Rupert, additional, Pirandola, Stefano, additional, Rarity, John G., additional, and Joshi, Siddarth Koduru, additional

Published
2022
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127. Interaction-Free Polarimetry of a Polarising Object

Author

Hance, Jonte R and Rarity, John G

Subjects
QETLabs, Computer Science::Computer Vision and Pattern Recognition, Bristol Quantum Information Institute
Abstract

We extend counterfactual imaging to polarimetry of a polarising object. This allows imaging of these samples with far less absorbed energy - a key concern when imaging with high-frequency radiation.

Published
2022

136. Does the weak trace show the past of a quantum particle?

Author

Hance, Jonte R., Rarity, John, and Ladyman, James

Subjects
QETLabs, quant-ph, Centre for Science and Philosophy, physics.hist-ph
Abstract

We investigate the weak trace method for determining the path of a quantum particle in an unperturbed system. Specifically, looking at nested interferometer experiments, when internal interferometers are tuned to destructive interference, we show that the weak trace method gives misleading results. This is because the methods used experimentally to obtain the weak value of the position operator necessarily perturb the system, hence, in some cases the assumption that weak coupling being equivalent to no coupling is incorrect. Experiments performed that are claimed to support the interpretation simply show the effects of this coupling acting as measurement, rather than tapping into the underlying reality of what happens in a quantum system when no-one is looking.

Published
2021

139. Payload Testing of a Weak Coherent Pulse Quantum Key Distribution Module for the Responsive Operations on Key Services (ROKS) Mission

Author

Mercury, Cassandra, Mohapatra, Sonali, Colquhoun, Craig, Greenland, Steve, Cebecauer, Mikulas, Karagiannakis, Philippos, McTaggart, Ahren, Lowndes, David, Stefko, Milan, and Rarity, John

Abstract

Quantum Key Distribution (QKD) missions currently in development for space are expanding in number due to the increasing need for more secure means of encryption combined with the range limitations of terrestrial QKD. Most of these new missions are using smaller satellites to test their payloads. The ROKS (Responsive Operations for Key Services) mission is one such mission. It will utilize a 6U CubeSat bus and is set to launch in Q4 2022. A breadboard model of a 785nm weak coherent pulse quantum source module designed for ROKS, named JADE, was tested within a lab testbench environment with the mission’s systems represented by breadboard models with equivalent components. JADE’s optical module was miniaturized to be compatible with the limited payload volumes of these small classes of satellites. Lab-based testbench characterization of JADE’s ability to emit quantum pulses with four polarization states that propagate through the beam steering system for analysis by a receiver box was demonstrated. Future work will focus on further shrinking the JADE module down to less than 1/3U size, increasing the interoperability of the module with standard interfaces for both CubeSats and SmallSats, and adding further capabilities and full environmental testing qualification to JADE.

Published
2021

144. Error-protected qubits in a silicon photonic chip

Author

Vigliar, Caterina, primary, Paesani, Stefano, additional, Ding, Yunhong, additional, Adcock, Jeremy C., additional, Wang, Jianwei, additional, Morley-Short, Sam, additional, Bacco, Davide, additional, Oxenløwe, Leif K., additional, Thompson, Mark G., additional, Rarity, John G., additional, and Laing, Anthony, additional

Published
2021
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145. Quantum communications at ESA: Towards a space experiment on the ISS

Author

Perdigues Armengol, Josep Maria, Furch, Bernhard, de Matos, Clovis Jacinto, Minster, Olivier, Cacciapuoti, Luigi, Pfennigbauer, Martin, Aspelmeyer, Markus, Jennewein, Thomas, Ursin, Rupert, Schmitt-Manderbach, Tobias, Baister, Guy, Rarity, John, Leeb, Walter, Barbieri, Cesare, Weinfurter, Harald, and Zeilinger, Anton

Published
2008
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150. Advances in space quantum communications

Author

Sidhu, Jasminder S., primary, Joshi, Siddarth K., additional, Gündoğan, Mustafa, additional, Brougham, Thomas, additional, Lowndes, David, additional, Mazzarella, Luca, additional, Krutzik, Markus, additional, Mohapatra, Sonali, additional, Dequal, Daniele, additional, Vallone, Giuseppe, additional, Villoresi, Paolo, additional, Ling, Alexander, additional, Jennewein, Thomas, additional, Mohageg, Makan, additional, Rarity, John G., additional, Fuentes, Ivette, additional, Pirandola, Stefano, additional, and Oi, Daniel K. L., additional

Published
2021
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