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Related Experiment Video

Updated: Jan 28, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Verified quantum information scrambling.

K A Landsman¹, C Figgatt², T Schuster³

¹Joint Quantum Institute, Department of Physics and Joint Center for Quantum Information and Computer Science, University of Maryland, College Park, MD, USA. kalands@umd.edu.

|March 8, 2019

Summary

This summary is machine-generated.

Researchers developed a new quantum circuit to detect quantum scrambling, a key feature of chaos in quantum systems. This method uses quantum teleportation for an unambiguous test, overcoming limitations of previous techniques.

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Area of Science:

Quantum Information Science
Quantum Computing
Condensed Matter Physics

Background:

Quantum scrambling describes information dispersal into many-body entanglement.
It's crucial for understanding thermalization and black hole chaos.
Direct experimental measurement is challenging due to complexity.

Purpose of the Study:

To implement a novel quantum circuit for a positive test of quantum scrambling.
To distinguish quantum scrambling from ordinary decoherence.
To experimentally characterize scrambling dynamics.

Main Methods:

Engineered a quantum circuit with a tunable three-qubit unitary operation.
Utilized a seven-qubit ion trap quantum computer.
Employed conditional quantum teleportation to probe scrambling.
Simultaneously measured out-of-time-ordered correlation functions (OTOCs).

Main Results:

Achieved typical teleportation fidelities of approximately 80%.
Provided an unambiguous experimental test for quantum scrambling.
Successfully bounded the scrambling-induced decay of OTOCs.

Conclusions:

The implemented quantum circuit offers a robust method for detecting quantum scrambling.
Conditional teleportation serves as a powerful tool for characterizing quantum chaos.
This work advances experimental capabilities in studying complex quantum dynamics.