57 citations · 160 across the 13 of their papers we have counts for
13 papers
Inevitability of knowing less than nothing
Gilad Gour, Mark M. Wilde, Sarah Brandsen +1
A colloquial interpretation of entropy is that it is the knowledge gained upon learning the outcome of a random experiment. Conditional entropy is then interpreted as the knowledge…
Belief Propagation with Quantum Messages for Symmetric Classical-Quantum Channels
S. Brandsen, Avijit Mandal, Henry D. Pfister
Belief propagation (BP) is a classical algorithm that approximates the marginal distribution associated with a factor graph by passing messages between adjacent nodes in the graph.…
Quantum conditional entropy from information-theoretic principles
Sarah Brandsen, Isabelle J. Geng, Mark M. Wilde +1
We introduce an axiomatic approach for characterizing quantum conditional entropy. Our approach relies on two physically motivated axioms: monotonicity under conditional majorizati…
What is Entropy? A new perspective from games of chance
Sarah Brandsen, Isabelle Jianing Geng, Gilad Gour
Given entropy's central role in multiple areas of physics and science, one important task is to develop a systematic and unifying approach to defining entropy. Games of chance beco…
Reinforcement Learning with Neural Networks for Quantum Multiple Hypothesis Testing
Sarah Brandsen, Kevin D. Stubbs, Henry D. Pfister
Reinforcement learning with neural networks (RLNN) has recently demonstrated great promise for many problems, including some problems in quantum information theory. In this work, w…
Explicit construction of optimal witnesses for input-output correlations attainable by quantum channels
Michele Dall'Arno, Sarah Brandsen, Francesco Buscemi
Given a quantum channel -- that is, a completely positive trace-preserving linear map -- as the only communication resource available between two parties, we consider the problem o…
Adaptive Procedures for Discrimination Between Arbitrary Tensor-Product Quantum States
Sarah Brandsen, Mengke Lian, Kevin D. Stubbs +2
Discrimination between quantum states is a fundamental task in quantum information theory. Given two arbitrary tensor-product quantum states (TPQS) $ρ_{\pm} = ρ_{\pm}^{(1)} \otimes…
No-hypersignaling principle
Michele Dall'Arno, Sarah Brandsen, Alessandro Tosini +2
A paramount topic in quantum foundations, rooted in the study of the EPR paradox and Bell inequalities, is that of characterizing quantum theory in terms of the space-like correlat…
Device-independent tests of quantum measurements
Michele Dall'Arno, Sarah Brandsen, Francesco Buscemi +1
We consider the problem of characterizing the set of input-output correlations that can be generated by an arbitrarily given quantum measurement. Our main result is to provide a cl…
Device-independent tests of quantum channels
Michele Dall'Arno, Sarah Brandsen, Francesco Buscemi
We develop a device-independent framework for testing quantum channels. That is, we falsify a hypothesis about a quantum channel based only on an observed set of input-output corre…
Communication capacity of mixed quantum t designs
Sarah Brandsen, Michele Dall'Arno, Anna Szymusiak
We operationally introduce mixed quantum t-designs as the most general arbitrary-rank extension of projective quantum t-designs which preserves indistinguishability from the unifor…
Device independent witnessing of unknown quantum channels
Michele Dall'Arno, Sarah Brandsen, Francesco Buscemi
Quantum process tomography, the standard procedure to characterize any quantum channel in nature, is affected by a circular argument: in order to characterize the channel, the tomo…
Heterostructure Symmetry and the Orientation of the Quantum Hall Nematic Phases
J. Pollanen, K. B. Cooper, S. Brandsen +3
Clean two-dimensional electron systems in GaAs/AlGaAs heterostructures exhibit anisotropic collective phases, the quantum Hall nematics, at high Landau level occupancy and low temp…