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Application of Deep Learning-Based Medical Image Segmentation via Orbital Computed Tomography

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Published on: November 30, 2022

Overlapping qubits from non-isometric maps and de Sitter tensor networks.

ChunJun Cao^1,2,3, Wissam Chemissany⁴, Alexander Jahn^5,6

¹Joint Center for Quantum Information and Computer Science, University of Maryland, College Park, MD, USA.

Nature Communications

|January 3, 2025

Summary

This summary is machine-generated.

Researchers created overlapping qubits to mimic local physics in quantum gravity theories with fewer degrees of freedom. Deviations reveal quantum gravity features, showing how effective theories emerge from fundamental ones.

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Area of Science:

Theoretical Physics
Quantum Gravity
Quantum Information

Background:

A key challenge in theoretical physics is understanding how local effective theories emerge from fundamental theories of quantum gravity with fewer degrees of freedom.
Recent approaches focus on analyzing the Hilbert space maps connecting these theories.

Purpose of the Study:

To construct approximately local observables (overlapping qubits) from non-isometric maps between quantum gravity theories.
To investigate how local processes in effective theories can be simulated by systems with fewer degrees of freedom.

Main Methods:

Construction of approximately local observables using non-isometric Hilbert space maps.
Development of tensor network models for de Sitter spacetime to demonstrate the concept.

Main Results:

Demonstrated that local processes in effective theories can be "spoofed" by quantum systems with fewer degrees of freedom.
Identified deviations from actual locality as signatures of quantum gravity.
Tensor network models of de Sitter space showed that exponential expansion and local physics can be mimicked for extended periods before breakdown.

Conclusions:

The study establishes a connection between overlapping qubits, Hilbert space dimension, black hole information paradox, holography, and approximate locality in quantum gravity.
These findings offer insights into the emergence of spacetime and locality from fundamental quantum gravity principles.