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Quantifying nonstabilizerness through entanglement spectrum flatness

Apr 3, 2023

6 pages

Published in:

Phys.Rev.A 109 (2024) 4, L040401

Published: Apr 24, 2024

e-Print:

2304.01175 [quant-ph]

DOI:

10.1103/PhysRevA.109.L040401 (publication)

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Abstract: (APS)

Nonstabilizerness, also colloquially referred to as magic, is a resource for advantage in quantum computing and lies in the access to non-Clifford operations. Developing a comprehensive understanding of how nonstabilizerness can be quantified and how it relates to other quantum resources is crucial for studying and characterizing the origin of quantum complexity. In this work, we establish a direct connection between nonstabilizerness and entanglement spectrum flatness for a pure quantum state. We show that this connection can be exploited to efficiently probe nonstabilizerness even in the presence of noise. Our results reveal a direct connection between nonstabilizerness and entanglement response, and define a clear experimental protocol to probe nonstabilizerness in cold atom and solid-state platforms.

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