ORCID Profile
0000-0002-1990-7687
Current Organisations
Lund University
,
Max-Planck-Institut für die Physik des Lichts
,
Danmarks Tekniske Universitet
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Optica Publishing Group
Date: 14-12-2020
DOI: 10.1364/AOP.361502
Abstract: Quantum cryptography is arguably the fastest growing area in quantum information science. Novel theoretical protocols are designed on a regular basis, security proofs are constantly improving, and experiments are gradually moving from proof-of-principle lab demonstrations to in-field implementations and technological prototypes. In this paper, we provide both a general introduction and a state-of-the-art description of the recent advances in the field, both theoretical and experimental. We start by reviewing protocols of quantum key distribution based on discrete variable systems. Next we consider aspects of device independence, satellite challenges, and protocols based on continuous-variable systems. We will then discuss the ultimate limits of point-to-point private communications and how quantum repeaters and networks may overcome these restrictions. Finally, we will discuss some aspects of quantum cryptography beyond standard quantum key distribution, including quantum random number generators and quantum digital signatures.
Publisher: American Physical Society (APS)
Date: 13-12-2001
Publisher: Elsevier BV
Date: 2017
Publisher: American Physical Society (APS)
Date: 04-08-2006
Publisher: Springer Science and Business Media LLC
Date: 07-09-2021
DOI: 10.1007/S00114-021-01745-X
Abstract: Urbanisation is proceeding at an alarming rate which forces wildlife to either retreat from urban areas or cope with novel stressors linked to human presence and activities. For ex le, urban stressors like anthropogenic noise, artificial light at night and chemical pollution can have severe impacts on the physiology of wildlife (and humans), in particular the immune system and antioxidant defences. These physiological systems are important to combat and reduce the severity of parasitic infections, which are common among wild animals. One question that then arises is whether urban-dwelling animals, whose immune and antioxidant system are already challenged by the urban stressors, are more susceptible to parasitic infections. To assess this, we studied nestlings of Eurasian kestrels ( Falco tinnunculus ) in Vienna, Austria, during 2015 and 2017. We measured biomarkers of innate immune function, oxidative stress and body mass index and ectoparasite infection intensity in 143 nestlings (from 56 nests) along an urban gradient. Nestlings in more urbanised areas had overall fewer ectoparasites, lower haemolysis (complement activity) and lower body mass index compared to nestlings in less urbanised areas. None of the other immune or oxidative stress markers were associated with the urban gradient. Despite some non-significant results, our data still suggest that kestrel nestlings experience some level of reduced physiological health, perhaps as a consequence of exposure to more urban stressors or altered prey availability in inner-city districts even though they had an overall lower ectoparasite burden in these heavily urbanised areas.
Publisher: Elsevier BV
Date: 10-2002
Publisher: The Optical Society
Date: 12-07-2018
Publisher: Springer Science and Business Media LLC
Date: 29-11-2016
DOI: 10.1038/NCOMMS13628
Abstract: Laser cooling is a fundamental technique used in primary atomic frequency standards, quantum computers, quantum condensed matter physics and tests of fundamental physics, among other areas. It has been known since the early 1990s that laser cooling can, in principle, be improved by using squeezed light as an electromagnetic reservoir while quantum feedback control using a squeezed light probe is also predicted to allow improved cooling. Here we show the implementation of quantum feedback control of a micro-mechanical oscillator using squeezed probe light. This allows quantum-enhanced feedback cooling with a measurement rate greater than it is possible with classical light, and a consequent reduction in the final oscillator temperature. Our results have significance for future applications in areas ranging from quantum information networks, to quantum-enhanced force and displacement measurements and fundamental tests of macroscopic quantum mechanics.
Publisher: OSA
Date: 2018
Publisher: American Physical Society (APS)
Date: 18-09-2007
Publisher: American Physical Society (APS)
Date: 19-06-2009
Publisher: American Physical Society (APS)
Date: 03-05-2002
Publisher: IOP Publishing
Date: 22-07-2016
Publisher: Wiley
Date: 31-10-2015
Publisher: Springer Science and Business Media LLC
Date: 03-02-2017
DOI: 10.1038/NCOMMS14489
Abstract: Nature Communications 7: Article number: 13628 (2014) Published 29 November 2016 Updated 3 February 2017 This Article contains a typographical error in the second line of the right column on page 4, in which the exponent ‘−1’ incorrectly appears before the final closing parenthesis. The correct equation is
Publisher: The Optical Society
Date: 24-04-2013
DOI: 10.1364/OL.38.001413
Publisher: IEEE
Date: 05-2013
Publisher: American Physical Society (APS)
Date: 21-06-2012
Publisher: Springer Science and Business Media LLC
Date: 11-2003
Publisher: American Physical Society (APS)
Date: 10-03-2021
Publisher: American Physical Society (APS)
Date: 10-12-2009
Publisher: IOP Publishing
Date: 05-04-2002
Publisher: OSA
Date: 2017
No related grants have been discovered for Ulrik Lund Andersen.