Zobrazeno 1 - 10
of 316
pro vyhledávání: '"Ulrik L Andersen"'
Publikováno v:
New Journal of Physics, Vol 20, Iss 8, p 083042 (2018)
We propose an optomechanical setup allowing quantum mechanical correlation, entanglement and steering of two ultrashort optical pulses. The protocol exploits an indirect interaction between the pulses mediated optomechanically by letting both interac
Externí odkaz:
https://doaj.org/article/e9fbd458c94c496cba71a4ee43ce4e37
Autor:
Uwe Jantzen, Andrea B Kurz, Daniel S Rudnicki, Clemens Schäfermeier, Kay D Jahnke, Ulrik L Andersen, Valery A Davydov, Viatcheslav N Agafonov, Alexander Kubanek, Lachlan J Rogers, Fedor Jelezko
Publikováno v:
New Journal of Physics, Vol 18, Iss 7, p 073036 (2016)
Colour centres in nanodiamonds are an important resource for applications in quantum sensing, biological imaging, and quantum optics. Here we report unprecedented narrow optical transitions for individual colour centres in nanodiamonds smaller than 2
Externí odkaz:
https://doaj.org/article/7f66baf17a8745eb862ae70b8e79de80
Autor:
Adnan A. E. Hajomer, Nitin Jain, Hossein Mani, Hou-Man Chin, Ulrik L. Andersen, Tobias Gehring
Publikováno v:
npj Quantum Information, Vol 8, Iss 1, Pp 1-8 (2022)
Abstract Distributing cryptographic keys over public channels in a way that can provide information-theoretic security is the holy grail for secure communication. This can be achieved by exploiting quantum mechanical principles in so-called quantum k
Externí odkaz:
https://doaj.org/article/cd1341dafa244f82a7bd5b837d5a5061
Autor:
Nitin Jain, Hou-Man Chin, Hossein Mani, Cosmo Lupo, Dino Solar Nikolic, Arne Kordts, Stefano Pirandola, Thomas Brochmann Pedersen, Matthias Kolb, Bernhard Ömer, Christoph Pacher, Tobias Gehring, Ulrik L. Andersen
Publikováno v:
Nature Communications, Vol 13, Iss 1, Pp 1-8 (2022)
Continuous-variable QKD protocols are usually easier to implement than discrete-variables ones, but their security analyses are less developed. Here, the authors propose and demonstrate in the lab a CVQKD protocol that can generate composable keys se
Externí odkaz:
https://doaj.org/article/d7d2e36f3a5f4381a6246f80cf68e2f0
Autor:
Kimin Park, Jacob Hastrup, Jonas Schou Neergaard-Nielsen, Jonatan Bohr Brask, Radim Filip, Ulrik L. Andersen
Publikováno v:
npj Quantum Information, Vol 8, Iss 1, Pp 1-8 (2022)
Abstract Quantum information encoded into the superposition of coherent states is an illustrative representation of practical applications of macroscopic quantum coherence possessing. However, these states are very sensitive to energy loss, losing th
Externí odkaz:
https://doaj.org/article/2743600d615a42519da7eeb44f24fd41
Autor:
Stefano Pirandola, Carlo Ottaviani, Christian S. Jacobsen, Gaetana Spedalieri, Samuel L. Braunstein, Tobias Gehring, Ulrik L. Andersen
Publikováno v:
npj Quantum Information, Vol 7, Iss 1, Pp 1-7 (2021)
Abstract We consider a quantum relay that is used by two parties to perform several continuous-variable protocols of quantum communication, from entanglement distribution (swapping and distillation) to quantum teleportation, and quantum key distribut
Externí odkaz:
https://doaj.org/article/33253da31ed049fe951594b46796fb39
Publikováno v:
npj Quantum Information, Vol 7, Iss 1, Pp 1-6 (2021)
Abstract The secret key rate of a continuous-variable quantum key distribution (CV-QKD) system is limited by excess noise. A key issue typical to all modern CV-QKD systems implemented with a reference or pilot signal and an independent local oscillat
Externí odkaz:
https://doaj.org/article/507e5e56c9ba425fb77a50d85751d1b9
Autor:
Tobias Gehring, Cosmo Lupo, Arne Kordts, Dino Solar Nikolic, Nitin Jain, Tobias Rydberg, Thomas B. Pedersen, Stefano Pirandola, Ulrik L. Andersen
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-11 (2021)
Security analyses for trusted quantum random number generators usually consider only classical side-information. Here, the authors fill this gap by fully characterising the experimental apparatus of a homodyne-based QRNG, assuming that the vacuum flu
Externí odkaz:
https://doaj.org/article/ca01ff6c14f64cc4a33d4de3f43894e5
Autor:
Mikkel V. Larsen, Christopher Chamberland, Kyungjoo Noh, Jonas S. Neergaard-Nielsen, Ulrik L. Andersen
Publikováno v:
PRX Quantum, Vol 2, Iss 3, p 030325 (2021)
Continuous-variable measurement-based quantum computation on cluster states has in recent years shown great potential for scalable, universal, and fault-tolerant quantum computation when combined with the Gottesman-Kitaev-Preskill (GKP) code and quan
Externí odkaz:
https://doaj.org/article/17acaa4286e843bd8f340c77ec58c1c2
Autor:
Alexander Stark, Nati Aharon, Thomas Unden, Daniel Louzon, Alexander Huck, Alex Retzker, Ulrik L. Andersen, Fedor Jelezko
Publikováno v:
Nature Communications, Vol 8, Iss 1, Pp 1-6 (2017)
State-of-the-art methods for sensing weak AC fields are only efficient in the low frequency domain. Here, Stark et al. demonstrate a sensing scheme that is capable of probing high frequencies through continuous dynamical coupling by applying it to a
Externí odkaz:
https://doaj.org/article/ef585d762fc44c9681eb221d4461f67d