Results 41 to 50 of about 1,751,815 (231)

Quantum-enhanced radiometry via approximate quantum error correction

open access: yesNature Communications, 2022
Exotic quantum states can be advantageous for sensing, but are very fragile, so that some form of quantum error correction is needed. Here, the authors show how approximate QEC helps overcoming decoherence due to noise when measuring the excitation ...
W. Wang   +14 more
doaj   +1 more source

Quantum Information Transfer between a Two-Level and a Four-Level Quantum System [PDF]

open access: yesPhoton. Res. 10, 2854-2865 (2022), 2020
Quantum mechanics provides a disembodied way to transfer quantum information from one quantum object to another. In theory, this quantum information transfer can occur between quantum objects of any dimension, yet the reported experiments of quantum information transfer to date have mainly focused on the cases where the quantum objects have the same ...
arxiv   +1 more source

Strategies for achieving high key rates in satellite-based QKD

open access: yesnpj Quantum Information, 2021
Quantum key distribution (QKD) is a pioneering quantum technology on the brink of widespread deployment. Nevertheless, the distribution of secret keys beyond a few 100 km at practical rates remains a major challenge.
Sebastian Ecker   +8 more
doaj   +1 more source

Quantum Information Causality [PDF]

open access: yesPhysical Review Letters, 2013
How much information can a transmitted physical system fundamentally communicate? We introduce the principle of quantum information causality, which states the maximum amount of quantum information that a quantum system can communicate as a function of its dimension, independently of any previously shared quantum physical resources.
openaire   +4 more sources

Quantum advantages for transportation tasks - projectiles, rockets and quantum backflow

open access: yesnpj Quantum Information, 2023
Consider a scenario where a quantum particle is initially prepared in some bounded region of space and left to propagate freely. After some time, we verify if the particle has reached some distant target region.
David Trillo   +2 more
doaj   +1 more source

Partial quantum information [PDF]

open access: yesNature, 2005
Information--be it classical or quantum--is measured by the amount of communication needed to convey it. In the classical case, if the receiver has some prior information about the messages being conveyed, less communication is needed. Here we explore the concept of prior quantum information: given an unknown quantum state distributed over two systems,
Horodecki, M, Oppenheim, J, Winter, AJ
openaire   +4 more sources

Quantum information is physical [PDF]

open access: yesSuperlattices and Microstructures, 1998
28 pages, Latex, 2 eps figures, Paper to be published in Superlattices and Microstructures, Special Issue on the Occasion of Rolf Landauer's 70th Birthday. V2: 11 pages, small corrections to Sect.
DiVincenzo, D. P., Loss, D.
openaire   +4 more sources

Relativistically invariant quantum information [PDF]

open access: yes, 2004
We show that quantum information can be encoded into entangled states of multiple indistinguishable particles in such a way that any inertial observer can prepare, manipulate, or measure the encoded state independent of their Lorentz reference frame ...
Daniel R. Terno   +4 more
core   +3 more sources

Noiseless photonic non-reciprocity via optically-induced magnetization

open access: yesNature Communications, 2021
Optical nonreciprocity through magneto-optical effects requires bulky apparatuses and strong magnetic fields, while magnetic-free approaches are difficult to implement. Here, the authors use optically-induced magnetisation in an atomic ensemble to get 50
Xin-Xin Hu   +11 more
doaj   +1 more source

Distribution of high-dimensional entanglement via an intra-city free-space link

open access: yesNature Communications, 2017
Increasing the dimensionality of entangled states improves robustness and capacity of secure quantum communications, but it requires suitably modified setups.
Fabian Steinlechner   +7 more
doaj   +1 more source

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