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Quantum Channels and Quantum Operations
2023Abstract In this chapter we visit the ‘church of the larger Hilbert space’: we take a closer look at the relationship of pure and mixed quantum states via purification, and discuss a similar connection between completely positive and trace-preserving (CPTP) maps and unitary dynamics on a larger Hilbert space. We show that such CPTP maps,
Reinhold A. Bertlmann, Nicolai Friis
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Quantum Channel Identification Problem
Physical Review A, 2001This paper explores an entirely new application of the quantum entanglement. The problem treated here is the quantum channel identification problem: given a parametric family {Γθ}θ of quantum channels, find the best strategy of estimating the true value of the parameter θ.
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Quantum Entropy and Quantum Channel
1997In this section, we discuss the entropy in usual quantum dynamical systems (QDS for short) described by Hilbert space terminology. A formulation of quantum mechanical entropy, started by Von Neumann around 1930, 20 years ahead of Shannon, now becomes a fundamental tool to analyze physical phenomena. Von Neumann entropy is defined for a density operator
R. S. Ingarden, A. Kossakowski, M. Ohya
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Conference on Lasers and Electro-Optics 2012, 2012
Channel capacities measure the ultimate communication abilities of noisy channels. I discuss capacities for optical channels with Gaussian noise and show the capacity for quantum information has surprising aspects that could be probed experimentally.
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Channel capacities measure the ultimate communication abilities of noisy channels. I discuss capacities for optical channels with Gaussian noise and show the capacity for quantum information has surprising aspects that could be probed experimentally.
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Quantum guidelines for solid-state spin defects
Nature Reviews Materials, 2021Gary Wolfowicz +2 more
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Weyl, Dirac and high-fold chiral fermions in topological quantum matter
Nature Reviews Materials, 2021M Zahid Hasan +2 more
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The germanium quantum information route
Nature Reviews Materials, 2020Giordano Scappucci +2 more
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Materials challenges for trapped-ion quantum computers
Nature Reviews Materials, 2021Kenneth R Brown +2 more
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InP colloidal quantum dots for visible and near-infrared photonics
Nature Reviews Materials, 2023Guilherme Almeida
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