Results 51 to 60 of about 3,875,923 (367)
Fidelity and Fisher information on quantum channels
New Journal of Physics, 2017 The fidelity function for quantum states has been widely used in quantum information science and frequently arises in the quantification of optimal performances for the estimation and distinguishing of quantum states.
Haidong Yuan, Chi-Hang Fred Fung
doaj +1 more source
Proceedings, 2019 We report the presence of an asymmetry that arises when considering the performances of quantum communication channels whose outputs are connected via a rigid, distance-preserving, yet not completely-positive, transformation. From a classical perspective
Vittorio Giovannetti, Matteo Rosati
doaj +1 more source
Noise effects on purity and quantum entanglement in terms of physical implementability
npj Quantum Information, 2023 Quantum decoherence due to imperfect manipulation of quantum devices is a key issue in the noisy intermediate-scale quantum (NISQ) era. Standard analyses in quantum information and quantum computation use error rates to parameterize quantum noise ...
Yuchen Guo, Shuo Yang
doaj +1 more source
Frontiers in Quantum Science and Technology, 2023 We investigate the dynamics of a maximally entangled mixed state (MEMS) under the action of correlated noise channels. The channel acts in a way that its successive uses are correlated. We have studied the MEMS properties, including quantum coherence and
Natasha Awasthi +2 more
doaj +1 more source
Communication over Quantum Channels with Parameter Estimation
International Symposium on Information Theory, 2020 Communication over a random-parameter quantum channel when the decoder reconstructs the parameter sequence is considered in different scenarios. Regularized formulas are derived for the capacity-distortion regions with strictly-causal, causal, or non ...
Uzi Pereg
semanticscholar +1 more source
Protecting Quantum Fisher Information in Correlated Quantum Channels [PDF]
Annals of Physics, 2019 Quantum Fisher information (QFI) has potential applications in quantum metrology tasks. QFI is investigated when the consecutive actions of a quantum channel on the sequence of qubits have partial classical correlations. The results showed that while the
Ming‐Liang Hu, Huifeng Wang
semanticscholar +1 more source
Uncertainty principle of quantum processes
Physical Review Research, 2021 Heisenberg's uncertainty principle, which imposes intrinsic restrictions on our ability to predict the outcomes of incompatible quantum measurements to arbitrary precision, demonstrates one of the key differences between classical and quantum mechanics ...
Yunlong Xiao +3 more
doaj +1 more source
Programmable two-photon quantum interference in $10^3$ channels in opaque scattering media [PDF]
, 2015 We investigate two-photon quantum interference in an opaque scattering medium that intrinsically supports $10^6$ transmission channels. By adaptive spatial phase-modulation of the incident wavefronts, the photons are directed at targeted speckle spots or
Boller, Klaus -J. +5 more
core +4 more sources
Witnessing incompatibility of quantum channels [PDF]
Journal of Mathematics and Physics, 2019 We introduce the notion of incompatibility witness for quantum channels, defined as an affine functional that is non-negative on all pairs of compatible channels and strictly negative on some incompatible pair.
C. Carmeli +3 more
semanticscholar +1 more source
Quantum channel marginal problem
Physical Review Research, 2022 Given a set of local dynamics, are they compatible with a global dynamics? We systematically formulate these questions as quantum channel marginal problems. These problems are strongly connected to the generalization of the no-signaling conditions to quantized inputs and outputs and can be understood as a general toolkit to study notions of quantum ...
Hsieh, Chung-Yun +2 more
openaire +5 more sources