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Updated: Jun 14, 2025

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Fundamental Limits for Realizing Quantum Processes in Spacetime.

V Vilasini^1,2, Renato Renner²

¹Université Grenoble Alpes, Inria, 38000 Grenoble, France.

Physical Review Letters

|September 6, 2024

Summary

This summary is machine-generated.

Quantum and relativistic theories present challenges for causality. New no-go theorems show that quantum experiments with indefinite causal order in classical spacetimes require non-local systems or can be described by definite causal orders.

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Area of Science:

Theoretical Physics
Quantum Information
Relativity

Background:

Reconciling quantum mechanics and general relativity is a major challenge in physics.
Causality is a fundamental concept that differs between quantum and relativistic theories.
Bell's no-go theorem established limits on classical processes due to relativistic causality.

Purpose of the Study:

To investigate fundamental limits on quantum processes within classical relativistic spacetimes.
To explore the implications of indefinite causal order (ICO) for quantum causality.
To reconcile quantum and relativistic notions of causality, particularly for quantum switch experiments.

Main Methods:

Derivation of no-go theorems for quantum experiments in classical background spacetimes.
Analysis of general quantum processes, including those with indefinite causal order (ICO).
Examination of spacetime localization requirements for ICO processes respecting relativistic causality.

Main Results:

No-go theorems demonstrate fundamental limits on quantum processes in classical spacetimes.
Realizing ICO processes without violating relativistic causality necessitates non-localization of quantum systems.
Any such ICO realization can be described by a more fundamental, definite, and acyclic causal order process.

Conclusions:

The study provides a framework for reconciling quantum and relativistic causality.
No-go results offer insights into the behavior of causality and information processing in quantum relativistic regimes.
Findings are applicable to experimental realizations of quantum switch and other ICO processes.