Zobrazeno 1 - 10
of 113
pro vyhledávání: '"Marco Tomamichel"'
Publikováno v:
Quantum, Vol 8, p 1492 (2024)
We prove that the stabilizer fidelity is multiplicative for the tensor product of an arbitrary number of single-qubit states. We also show that the relative entropy of magic becomes additive if all the single-qubit states but one belong to a symmetry
Externí odkaz:
https://doaj.org/article/73f6de9d26e04e3fa1ab61ee9008a770
Autor:
Mario Berta, Fernando G. S. L. Brandão, Gilad Gour, Ludovico Lami, Martin B. Plenio, Bartosz Regula, Marco Tomamichel
Publikováno v:
Quantum, Vol 7, p 1103 (2023)
We show that the proof of the generalised quantum Stein's lemma [Brandão & Plenio, Commun. Math. Phys. 295, 791 (2010)] is not correct due to a gap in the argument leading to Lemma III.9. Hence, the main achievability result of Brandão & Plenio is
Externí odkaz:
https://doaj.org/article/7c9e4036238b4968888cc6931cc48ca5
Publikováno v:
Quantum, Vol 7, p 976 (2023)
Quantum homomorphic encryption, which allows computation by a server directly on encrypted data, is a fundamental primitive out of which more complex quantum cryptography protocols can be built. For such constructions to be possible, quantum homomorp
Externí odkaz:
https://doaj.org/article/34f6e2996a9b41978f66e371b7227aaf
Publikováno v:
Quantum, Vol 6, p 749 (2022)
We initiate the study of tradeoffs between exploration and exploitation in online learning of properties of quantum states. Given sequential oracle access to an unknown quantum state, in each round, we are tasked to choose an observable from a set of
Externí odkaz:
https://doaj.org/article/434f0ba8e5f9441ba2e1101d6dadf9ba
Publikováno v:
Nature Communications, Vol 9, Iss 1, Pp 1-9 (2018)
Estimating the quantum capacity allows one to assess the performance of quantum memories, communication channels, repeaters as well as error correction schemes. Here, the authors show how to estimate and verify one-shot quantum capacity in the most g
Externí odkaz:
https://doaj.org/article/dcc9e13889834809959753adf1e49742
Publikováno v:
Nature Communications, Vol 7, Iss 1, Pp 1-8 (2016)
The maximal rate at which quantum information can be reliably communicated through many uses of a memoryless quantum channel is determined by its quantum channel capacity. Here, the authors demonstrate that such an asymptotic characterization is insu
Externí odkaz:
https://doaj.org/article/e844ae2a3dd64c63a5a67987e76c4f48
Publikováno v:
Ledger, Vol 3, Iss 0 (2018)
The key cryptographic protocols used to secure the internet and financial transactions of today are all susceptible to attack by the development of a sufficiently large quantum computer. One particular area at risk is cryptocurrencies, a market curre
Externí odkaz:
https://doaj.org/article/2260afefc66e4d97b2e32c5481253676
Publikováno v:
Quantum, Vol 3, p 209 (2019)
Given two pairs of quantum states, we want to decide if there exists a quantum channel that transforms one pair into the other. The theory of quantum statistical comparison and quantum relative majorization provides necessary and sufficient condition
Externí odkaz:
https://doaj.org/article/8b359d02204d4dc791d0439366e53701
Publikováno v:
Quantum, Vol 3, p 126 (2019)
We investigate minimax estimators for quantum state tomography under general Bregman divergences. First, generalizing the work of Koyama et al. [Entropy 19, 618 (2017)] for relative entropy, we find that given any estimator for a quantum state, there
Externí odkaz:
https://doaj.org/article/891daab3608f4c4e918927dcd4c7c4bf
Publikováno v:
New Journal of Physics, Vol 21, Iss 3, p 033006 (2019)
In this paper, we explore an efficient online algorithm for quantum state estimation based on a matrix-exponentiated gradient method previously used in the context of machine learning. The state update is governed by a learning rate that determines h
Externí odkaz:
https://doaj.org/article/b98554e8a0ef4421b620b4ba0ac2cf08