Electron Spin Coherence Time of Nitrogen-Vacancy Center in Diamond Improved by External Electric Field

Teleportations of quantum gates are very important in the construction of quantum network and teleportation-based model of quantum computation. Assisted with nitrogenvacancy centers, we propose several schemes to teleport the quantum CNOT gate. Deterministic CNOT gate may be implemented on a remote two-photon system, remote two electron-spin system, hybrid photon-spin system or hybrid spin-photon system. Each photon only interacts with one spin each time. Moreover, quantum channel may be constructed by all combinations of the photon or electron-spin entanglement, or their hybrid entanglement. Since these electron-spin systems have experimentally shown a long coherence time even at the room temperature, our schemes provide useful ways for long-distance quantum applications.

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Spin Readout Techniques of the Nitrogen-Vacancy Center in Diamond

Micromachines ◽

10.3390/mi9090437 ◽

2018 ◽

Vol 9 (9) ◽

pp. 437 ◽

Cited By ~ 27

Author(s):

David Hopper ◽

Henry Shulevitz ◽

Lee Bassett

Keyword(s):

Quantum Information ◽

Electron Spin ◽

Room Temperature ◽

Information Science ◽

Nitrogen Vacancy ◽

Single Shot ◽

Spin Coherence ◽

Quantum Information Science ◽

Nitrogen Vacancy Center ◽

Vacancy Center

The diamond nitrogen-vacancy (NV) center is a leading platform for quantum information science due to its optical addressability and room-temperature spin coherence. However, measurements of the NV center’s spin state typically require averaging over many cycles to overcome noise. Here, we review several approaches to improve the readout performance and highlight future avenues of research that could enable single-shot electron-spin readout at room temperature.

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Sensing Electrochemical Signals Using a Nitrogen-Vacancy Center in Diamond

Nanomaterials ◽

10.3390/nano11020358 ◽

2021 ◽

Vol 11 (2) ◽

pp. 358

Author(s):

Hossein T. Dinani ◽

Enrique Muñoz ◽

Jeronimo R. Maze

Keyword(s):

Electric Field ◽

Electron Spin ◽

Electrolyte Solution ◽

High Sensitivity ◽

Theoretical Work ◽

Coherence Time ◽

Nitrogen Vacancy ◽

Local Concentration ◽

Concentration Of Ions ◽

Nv Center

Chemical sensors with high sensitivity that can be used under extreme conditions and can be miniaturized are of high interest in science and industry. The nitrogen-vacancy (NV) center in diamond is an ideal candidate as a nanosensor due to the long coherence time of its electron spin and its optical accessibility. In this theoretical work, we propose the use of an NV center to detect electrochemical signals emerging from an electrolyte solution, thus obtaining a concentration sensor. For this purpose, we propose the use of the inhomogeneous dephasing rate of the electron spin of the NV center (1/T2★) as a signal. We show that for a range of mean ionic concentrations in the bulk of the electrolyte solution, the electric field fluctuations produced by the diffusional fluctuations in the local concentration of ions result in dephasing rates that can be inferred from free induction decay measurements. Moreover, we show that for a range of concentrations, the electric field generated at the position of the NV center can be used to estimate the concentration of ions.

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