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Related Experiment Video

Updated: Feb 23, 2026

Gradient Echo Quantum Memory in Warm Atomic Vapor

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Published on: November 11, 2013

Protecting a Diamond Quantum Memory by Charge State Control.

Matthias Pfender¹, Nabeel Aslam¹, Patrick Simon²

¹Stuttgart Research Center of Photonic Engineering (SCoPE) and Center for Integrated Quantum Science and Technology (IQST), Third Institute of Physics, University of Stuttgart , 70569 Stuttgart, Germany.

|September 6, 2017

Summary

This summary is machine-generated.

Researchers identified the positively charged nitrogen-vacancy (NV) center in diamond as an electron-spin-less state. This discovery significantly enhances nuclear spin coherence times for quantum information processing.

Keywords:

Diamond charge state control nitrogen-vacancy center quantum memory spin qubit

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Area of Science:

Quantum Information Science
Solid-State Physics
Materials Science

Background:

Solid-state spin systems are key for quantum information processing.
Nitrogen-vacancy (NV) centers in diamond are promising qubits.
Achieving long coherence times is crucial for quantum applications.

Purpose of the Study:

To identify a suitable charge state for NV centers to store nuclear spin qubit coherence.
To characterize the properties of this new charge state.
To improve nuclear spin coherence times in NV centers.

Main Methods:

Utilizing the nuclear spin qubit as a probe to identify and characterize the NV center charge state.
Controlling electronic charge and spin using nanometer-scale gate electrodes.
Investigating the optical properties of the new charge state.

Main Results:

Identification and characterization of the positively charged NV center as an electron-spin-less and optically inactive state.
A four-fold lengthening of nuclear spin coherence times was achieved.
The new charge state enables switching of optical response for individual qubit addressability.

Conclusions:

The positively charged NV center is a viable platform for long nuclear spin coherence.
This finding overcomes a key limitation for NV center quantum information processing.
The ability to optically control individual nodes opens new avenues for scalable quantum computing.