Search Results for author: Michael Walter

Found 6 papers, 1 papers with code

Empirical Fading Model and Bayesian Calibration for Multipath-Enhanced Device-Free Localization

no code implementations11 May 2022 Martin Schmidhammer, Christian Gentner, Michael Walter, Stephan Sand, Benjamin Siebler, Uwe-Carsten Fiebig

Second, the Bayesian approach is presented, which, based on the derived empirical fading model, relates measured changes in the power of a multipath component to the location of the reflection point.

Near optimal sample complexity for matrix and tensor normal models via geodesic convexity

1 code implementation14 Oct 2021 Cole Franks, Rafael Oliveira, Akshay Ramachandran, Michael Walter

For the matrix normal model, all our bounds are minimax optimal up to logarithmic factors, and for the tensor normal model our bound for the largest factor and overall covariance matrix are minimax optimal up to constant factors provided there are enough samples for any estimator to obtain constant Frobenius error.

Polynomial time algorithms in invariant theory for torus actions

no code implementations15 Feb 2021 Peter Bürgisser, M. Levent Doğan, Visu Makam, Michael Walter, Avi Wigderson

We also show how to efficiently find separating invariants for orbits, and how to compute systems of generating rational invariants for these actions (in contrast, for polynomial invariants the latter is known to be hard).

Data Structures and Algorithms Mathematical Physics Algebraic Geometry Mathematical Physics Representation Theory

Effective screening of medium-assisted Van der Waals interactions between embedded particles

no code implementations2 Feb 2021 Johannes Fiedler, Michael Walter, Stefan Yoshi Buhmann

The effect of an implicit medium on dispersive interactions of particle pairs is discussed and simple expressions for the correction relative to vacuum are derived.

Mesoscale and Nanoscale Physics Quantum Physics

Quantum Gravity in the Lab: Teleportation by Size and Traversable Wormholes, Part II

no code implementations1 Feb 2021 Sepehr Nezami, Henry W. Lin, Adam R. Brown, Hrant Gharibyan, Stefan Leichenauer, Grant Salton, Leonard Susskind, Brian Swingle, Michael Walter

In [1] we discussed how quantum gravity may be simulated using quantum devices and gave a specific proposal -- teleportation by size and the phenomenon of size-winding.

Quantum Physics High Energy Physics - Theory

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