Regev, Oded and Vidick, Thomas
(2020)
*Bounds on Dimension Reduction in the Nuclear Norm.*
In:
Geometric Aspects of Functional Analysis: Israel Seminar (GAFA) 2017-2019 Volume II.
Lecture Notes in Mathematics.
No.2266.
Springer
, Cham, pp. 279-299.
ISBN 978-3-030-46761-6.
https://resolver.caltech.edu/CaltechAUTHORS:20190320-095834301

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## Abstract

For all n ≥ 1, we give an explicit construction of m × m matrices A_1,…,A_n with m = 2^([n/2]) such that for any d and d × d matrices A′_1,…,A′_n that satisfy ∥A_′i−A′_j∥S_1 ≤ ∥A_i−A_j∥S_1 ≤ (1+δ)∥A′_i−A′_j∥S_1 for all i,j∈{1,…,n} and small enough δ = O(n^(−c)), where c > 0 is a universal constant, it must be the case that d ≥ 2^([n/2]−1). This stands in contrast to the metric theory of commutative ℓ_p spaces, as it is known that for any p ≥ 1, any n points in ℓ_p embed exactly in ℓ^d_p for d = n(n−1)/2. Our proof is based on matrices derived from a representation of the Clifford algebra generated by n anti-commuting Hermitian matrices that square to identity, and borrows ideas from the analysis of nonlocal games in quantum information theory.

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Additional Information: | © 2020 Springer Nature Switzerland AG. First Online: 09 July 2020. The author “Oded Regev” was supported by the Simons Collaboration on Algorithms and Geometry and by the National Science Foundation (NSF) under Grant No. CCF-1814524. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF. The author “Thomas Vidick” was supported by NSF CAREER Grant CCF-1553477, a CIFAR Azrieli Global Scholar award, and the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center (NSF Grant PHY-1733907). We are grateful to IPAM and the organizers of the workshop “Approximation Properties in Operator Algebras and Ergodic Theory” where this work started. We also thank Assaf Naor for useful comments and encouragement. | ||||||||||||||||

Group: | Institute for Quantum Information and Matter | ||||||||||||||||

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Series Name: | Lecture Notes in Mathematics | ||||||||||||||||

Issue or Number: | 2266 | ||||||||||||||||

Record Number: | CaltechAUTHORS:20190320-095834301 | ||||||||||||||||

Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190320-095834301 | ||||||||||||||||

Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||

ID Code: | 93981 | ||||||||||||||||

Collection: | CaltechAUTHORS | ||||||||||||||||

Deposited By: | Tony Diaz | ||||||||||||||||

Deposited On: | 20 Mar 2019 17:06 | ||||||||||||||||

Last Modified: | 29 Jul 2020 17:59 |

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