2 citations · 2 across the 16 of their papers we have counts for
19 papers
Fast and Sure-ious Quantum Process Tomography
A. Afham, Sayantan Sen, Marco Tomamichel
Quantum process tomography (QPT) protocols are often designed by lifting quantum state tomography (QST) protocols through the Choi-Jamiolkowski isomorphism, at the cost of an extra…
Monotonicity of the Rényi channel capacity under non-signaling assisted channel simulation
Tina Shariat, Matt Hoogsteder-Riera, Marco Tomamichel
We give an alternative variational proof that non-signaling correlations shared between the sender and receiver cannot increase the Rényi capacity of a classical channel. This mono…
Sharp Data-Processing Region for Quantum Conditional Rényi Entropies
Milad M. Goodarzi, Yucheng Bao, Marco Tomamichel
We study the three-parameter family of quantum conditional Rényi entropies introduced in \textit{Commun. Math. Phys.} 407, 180 (2026). We prove that the previously esta…
No information transmission through quantum channels above capacity
Hao-Chung Cheng, Marco Tomamichel
We show that the capacity of a quantum channel demarcates a phase transition: while reliable transmission below capacity is always possible, any attempt to transmit information abo…
On the Power of Adaptivity in Testing Quantum States in Fidelity
Jan Seyfried, Sayantan Sen, Marco Tomamichel
We study the problems of quantum state certification, equivalence testing and independence testing. In certification, given samples of an unknown quantum state and the descript…
Strong Converse Exponent of Quantum State Merging
Mario Berta, Hao-Chung Cheng, Roberto Rubboli +1
We determine the strong converse exponent for the entanglement cost of quantum state merging, showing that it is characterized by the optimized - conditional Rényi entropies…
Weak Log-Majorization for Negative Lim-Pálfia Power Means
Marco Tomamichel
For and , let denote the weighted Kubo-Ando power mean of order and weight . Ando proved that, for every unitarily invariant norm, $\…
Hockey stick -divergences
Fumio Hiai, Milán Mosonyi, Marco Tomamichel
In this paper we give a systematic and unified treatment and extensions of various results on a new notion of quantum -divergences defined from quantum hockey stick divergences,…
Projections with Respect to Bures Distance and Fidelity: Closed-Forms and Applications
A. Afham, Marco Tomamichel
We derive simple and unified closed-form expressions for projections with respect to fidelity (equivalently, the Bures and purified distances) onto several sets of interest. These…
A complete characterisation of conditional entropies
Roberto Rubboli, Erkka Haapasalo, Marco Tomamichel
Entropies are fundamental measures of uncertainty with central importance in information theory and statistics and applications across all the quantitative sciences. Under a natura…
The strong converse exponent of composable randomness extraction against quantum side information
Roberto Rubboli, Marco Tomamichel
We find a tight characterization of the strong converse exponent for randomness extraction against quantum side information. In contrast to previous tight bounds, we employ a compo…
Conditions for Large-Sample Majorization of Pairs of Flat States in Terms of -z Relative Entropies
Frits Verhagen, Marco Tomamichel, Erkka Haapasalo
We offer the first operational interpretation of the -z relative entropies, a measure of distinguishability between two quantum states introduced by Jakšić et al. and Audenaert…
Additivity of quantum relative entropies as a single-copy criterion
Salman Beigi, Roberto Rubboli, Marco Tomamichel
The fundamental goal of information theory is to characterize complex operational tasks using efficiently computable information quantities, Shannon's capacity formula being the pr…
Testing (Conditional) Mutual Information
Jan Seyfried, Sayantan Sen, Marco Tomamichel
We investigate the sample complexity of mutual information and conditional mutual information testing. For conditional mutual information testing, given access to independent sampl…
A Unified Approach to Quantum Contraction and Correlation Coefficients
Ian George, Marco Tomamichel
The maximal correlation coefficient measures the linear correlation in a bipartite distribution and contraction coefficients measure how much information is lost under a noisy chan…
Umlaut information
Filippo Girardi, Aadil Oufkir, Bartosz Regula +3
The sphere-packing bound quantifies the error exponent for noisy channel coding for rates above a critical value. Here, we study the zero-rate limit of the sphere-packing bound and…
Quantum conditional entropies from convex trace functionals
Roberto Rubboli, Milad M. Goodarzi, Marco Tomamichel
We study geometric properties of trace functionals that generalize those in [Zhang, Adv. Math. 365:107053 (2020)], arising from a novel family of conditional entropies with applica…
Matrix Majorization in Large Samples with Varying Support Restrictions
Frits Verhagen, Marco Tomamichel, Erkka Haapasalo
We say that a matrix with non-negative entries majorizes another such matrix if there is a stochastic matrix such that . We study matrix majorization in large sam…
A fixed-point algorithm for matrix projections with applications in quantum information
Shrigyan Brahmachari, Roberto Rubboli, Marco Tomamichel
We develop a fixed-point iterative algorithm that computes the matrix projection with respect to the Bures distance on the set of positive definite matrices that are invariant unde…