Zobrazeno 1 - 10
of 2 178
pro vyhledávání: '"M. Assad"'
Verifying the security of a continuous variable quantum communication protocol via quantum metrology
Autor:
Lorcán O. Conlon, Biveen Shajilal, Angus Walsh, Jie Zhao, Jiri Janousek, Ping Koy Lam, Syed M. Assad
Publikováno v:
npj Quantum Information, Vol 10, Iss 1, Pp 1-11 (2024)
Abstract Quantum mechanics offers the possibility of unconditionally secure communication between multiple remote parties. Security proofs for such protocols typically rely on bounding the capacity of the quantum channel in use. In a similar manner,
Externí odkaz:
https://doaj.org/article/9ad04c5833d34c2db16d2acd10a1e386
Publikováno v:
Communications Physics, Vol 6, Iss 1, Pp 1-8 (2023)
Abstract It is a central fact in quantum mechanics that non-orthogonal states cannot be distinguished perfectly. In general, the optimal measurement for distinguishing such states is a collective measurement. However, to the best our knowledge, colle
Externí odkaz:
https://doaj.org/article/188ae03b9ed649bf8746fa28f75b8f2a
Publikováno v:
Physical Review Research, Vol 6, Iss 3, p 033315 (2024)
Measurement estimation bounds for local quantum multiparameter estimation, which provide lower bounds on possible measurement uncertainties, have so far been formulated in two ways: by extending the classical Cramér-Rao bound (e.g., the quantum Cram
Externí odkaz:
https://doaj.org/article/601be62fd7c34f3bb62cdae7e7773cee
Autor:
Jie Zhao, Hao Jeng, Lorcán O. Conlon, Spyros Tserkis, Biveen Shajilal, Kui Liu, Timothy C. Ralph, Syed M. Assad, Ping Koy Lam
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-8 (2023)
Abstract Quantum teleportation constitutes a fundamental tool for various applications in quantum communication and computation. However, state-of-the-art continuous-variable quantum teleportation is restricted to moderate fidelities and short-distan
Externí odkaz:
https://doaj.org/article/bdc7cce8966b47c8ae51e11ef221e3f1
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-9 (2023)
Abstract The maximum amount of entanglement achievable under passive transformations by continuous-variable states is called the entanglement potential. Recent work has demonstrated that the entanglement potential is upper-bounded by a simple functio
Externí odkaz:
https://doaj.org/article/f78bb89c880543abae08dad56eab5bcf
Publikováno v:
Quantum, Vol 8, p 1382 (2024)
Discrete-variable (DV) quantum key distribution (QKD) based on single-photon detectors and sources have been successfully deployed for long-range secure key distribution. On the other hand, continuous-variable (CV) quantum key distribution (QKD) base
Externí odkaz:
https://doaj.org/article/312d50b750f5408cb34d9ad0bb6b0eec
Autor:
Özlem Erkılıç, Lorcán Conlon, Biveen Shajilal, Sebastian Kish, Spyros Tserkis, Yong-Su Kim, Ping Koy Lam, Syed M. Assad
Publikováno v:
npj Quantum Information, Vol 9, Iss 1, Pp 1-12 (2023)
Abstract Decoherence is detrimental to quantum key distribution (QKD) over large distances. One of the proposed solutions is to use quantum repeaters, which divide the total distance between the users into smaller segments to minimise the effects of
Externí odkaz:
https://doaj.org/article/1e21674811834540b3d2af17625ab58b
Autor:
Lorcán O Conlon, Angus Walsh, Yuhan Hua, Oliver Thearle, Tobias Vogl, Falk Eilenberger, Ping Koy Lam, Syed M Assad
Publikováno v:
New Journal of Physics, Vol 26, Iss 5, p 053003 (2024)
Quantum mechanics has withstood every experimental test thus far. However, it relies on ad-hoc postulates which require experimental verification. Over the past decade there has been a great deal of research testing these postulates, with numerous te
Externí odkaz:
https://doaj.org/article/5f742c245ed545d49563d3ea5f4340c9
Autor:
Lorcán O. Conlon, Thibault Michel, Giovanni Guccione, Kirk McKenzie, Syed M. Assad, Ping Koy Lam
Publikováno v:
npj Microgravity, Vol 8, Iss 1, Pp 1-10 (2022)
Abstract Satellite geodesy uses the measurement of the motion of one or more satellites to infer precise information about the Earth’s gravitational field. In this work, we consider the achievable precision limits on such measurements by examining
Externí odkaz:
https://doaj.org/article/c4dc55ebc9e543be8a7d481ee086c7ad
Publikováno v:
Entropy, Vol 25, Iss 8, p 1122 (2023)
This work compares the performance of single- and two-qubit probes for estimating several phase rotations simultaneously under the action of different noisy channels. We compute the quantum limits for this simultaneous estimation using collective and
Externí odkaz:
https://doaj.org/article/b1f572f46f144aaa80578cac87b736d9