Comparison of quantum channels by superchannels

G Gour - IEEE Transactions on Information Theory, 2019 - ieeexplore.ieee.org
We extend the definition of the conditional min-entropy from bipartite quantum states to
bipartite quantum channels. We show that many of the properties of the conditional min …

Fundamental limitations on distillation of quantum channel resources

B Regula, R Takagi - Nature Communications, 2021 - nature.com
Quantum channels underlie the dynamics of quantum systems, but in many practical settings
it is the channels themselves that require processing. We establish universal limitations on …

No-go theorems for quantum resource purification

K Fang, ZW Liu - Physical Review Letters, 2020 - APS
The manipulation of quantum “resources” such as entanglement, coherence, and magic
states lies at the heart of quantum science and technology, empowering potential …

Resource theory of asymmetric distinguishability for quantum channels

X Wang, MM Wilde - Physical Review Research, 2019 - APS
This paper develops the resource theory of asymmetric distinguishability for quantum
channels, generalizing the related resource theory for states [Matsumoto, arXiv: 1010.1030 …

Dynamical entanglement

G Gour, CM Scandolo - Physical Review Letters, 2020 - APS
Unlike the entanglement of quantum states, very little is known about the entanglement of
bipartite channels, called dynamical entanglement. Here we work with the partial transpose …

Cost of quantum entanglement simplified

X Wang, MM Wilde - Physical Review Letters, 2020 - APS
Quantum entanglement is a key physical resource in quantum information processing that
allows for performing basic quantum tasks such as teleportation and quantum key …

Quantum metrology in the finite-sample regime

JJ Meyer, S Khatri, DS França, J Eisert… - arXiv preprint arXiv …, 2023 - arxiv.org
In quantum metrology, one of the major applications of quantum technologies, the ultimate
precision of estimating an unknown parameter is often stated in terms of the Cram\'er-Rao …

Dynamical resource theory of quantum coherence

G Saxena, E Chitambar, G Gour - Physical Review Research, 2020 - APS
Decoherence is all around us. Every quantum system that interacts with the environment is
doomed to decohere. While preserving quantum coherence is a major challenge faced in …

Entanglement of a bipartite channel

G Gour, CM Scandolo - Physical Review A, 2021 - APS
The most general quantum object that can be shared between two distant parties is a
bipartite channel, as it is the basic element to construct all quantum circuits. In general …

Application of the resource theory of channels to communication scenarios

R Takagi, K Wang, M Hayashi - Physical Review Letters, 2020 - APS
We introduce a resource theory of channels relevant to communication via quantum
channels, in which the set of constant channels—useless channels for communication tasks …