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Updated: Jul 7, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Decoherence of an n-qubit quantum memory.

Thomas Gorin¹, Carlos Pineda, Thomas H Seligman

¹Departamento de Física, Universidad de Guadalajara, Guadalajara, México.

Physical Review Letters

|February 1, 2008

Summary

We analyzed decoherence in quantum registers without nonlocal operations, finding it scales linearly with the number of qubits. This applies to systems where individual qubits interact with the environment independently.

Area of Science:

Quantum Information Science
Quantum Computing
Quantum Physics

Background:

Decoherence is a major obstacle in quantum computing, causing quantum states to lose their unique properties.
Understanding decoherence in multi-qubit systems is crucial for building robust quantum computers.
Previous studies often focused on specific entangled states or complex interactions.

Purpose of the Study:

To develop a general method for analyzing decoherence in noninteracting multi-qubit systems.
To establish the scaling of decoherence with the number of qubits (n).
To identify the key conditions for simplified decoherence analysis.

Main Methods:

Developed a sum rule to analyze decoherence in a system of n noninteracting qubits coupled to an environment.

Related Experiment Videos

Last Updated: Jul 7, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

Gradient Echo Quantum Memory in Warm Atomic Vapor

Published on: November 11, 2013

Derived a formula where each term represents a single qubit's entanglement with the rest.

Applied the derived formula to a random matrix model and a Greenberger-Horne-Zeilinger state coupled to a spin bath.

Main Results:

Decoherence scales linearly with the number of qubits (n).
The analysis requires small decoherence and uncorrelated qubit-environment couplings in the interaction picture.
The derived sum rule provides a tractable method for analyzing complex quantum systems.

Conclusions:

The study presents a significant simplification for understanding decoherence in large quantum registers.
Linear scaling offers a pathway to predict and mitigate decoherence in quantum devices.
The findings are applicable to various quantum systems, including those with specific entangled states like the Greenberger-Horne-Zeilinger state.