Results 41 to 50 of about 1,059,392 (308)
Partial quantum information [PDF]
Nature, 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
Unlearning quantum information [PDF]
The European Physical Journal D, 2014 Quantum dynamics can be driven by measurement. By constructing measurements that gain no information, effective unitary evolution can be induced on a quantum system, for example in ancilla driven quantum computation. In the non-ideal case where a measurement does reveal some information about the system, it may be possible to "unlearn" this information
openaire +4 more sources
Quantum information is physical [PDF]
Superlattices 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
Distribution of high-dimensional entanglement via an intra-city free-space link
Nature 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
npj Quantum Information, 2023 Entanglement distribution is at the heart of most quantum communication protocols. Inevitable loss of photons along quantum channels is a major obstacle for distributing entangled photons over long distances, as the no-cloning theorem forbids the ...
Lukas Achatz +9 more
doaj +1 more source
Quantum Control and Quantum Information Technology [PDF]
The Scientific World Journal, 2013 Quantum information technology has been recognized as one of the most promising future technologies (e.g., see [1]). The development of quantum control theory is a key task for practical quantum information technology (e.g., see [2–4]. Recent advances in quantum information technologies and robust quantum information processing require the dynamics of ...
Daoyi Dong +3 more
openaire +3 more sources
Noiseless photonic non-reciprocity via optically-induced magnetization
Nature 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
Nature Communications, 2017 To realize long-distance quantum communication it is required to have individually addressable quantum memories with programmable access to many cells. Here the authors report DLCZ-type quantum memories with 225 individually accessible memory cells in a ...
Y-F Pu +5 more
doaj +1 more source
Single ion qubit with estimated coherence time exceeding one hour
Nature Communications, 2021 Extending qubit coherence times represent one of the key challenges for quantum technologies. Here, after properly suppressing magnetic-field fluctuations, frequency instability and leakage of the microwave reference-oscillator, the authors infer ...
Pengfei Wang +9 more
doaj +1 more source
Quantum Coherence, Coherent Information and Information Gain in Quantum Measurement
, 2019 A measurement is deemed successful, if one can maximize the information gain by the measurement apparatus. Here, we ask if quantum coherence of the system imposes a limitation on the information gain during quantum measurement.
Pati, Arun Kumar +2 more
core +1 more source