quNV deprecated

Quantum Sensing by Diamond Magnetometer

quNV - Quantum Sensing by Diamond Magnetometer based on nitrogen-vacancy (NV) centers.
The NV center can be used as a quantum sensor for very sensitive magnetic field measurements.
NV centers consist of a nitrogen atom (red) next to a vacancy (white) in a carbon (grey) cubic lattice.
Energy-level scheme of the NV center. A green laser excites the NV center to the ³E state, from where it either decays to ³A or undergoes intersystem crossing to the metastable state ¹A, before decaying to the m_s = 0 ground state.
The grey curve shows the decrease of fluorescence at the resonance frequency. The m_s= ±1 ground level of the NV center splits up by applying a magnetic field (blue). The resonance frequencies shift linearly with the strength of the magnetic field.

Overview
Sample Experiments
Key Features
Applications
Downloads

This quantum diamond magnetometer and its experiments will introduce students to the concepts of quantum sensing. The design of the quNV is based on recent achievements of scientific research and demonstrates quantum sensing in a simple and user friendly system for student lab courses at colleges and universities.

The core of the quNV is a HPHT diamond with an ensemble of nitrogen-vacancy (NV) centers. The NV centers can be excited by light in the green spectrum. The excited state decays back to the ground state either directly or via an intermediate shelving state with different fluorescence intensity. The decay path depends on the electron spin of the NV centers. Thus, the electron spin can be read out optically.

The electron spin can be manipulated further by microwave radiation. By applying magnetic and electric fields, the energy levels of the spins can be shifted. Hence, different experiments and measurement applications are possible.

Sample Experiments

Here is a list of the experiments you can do with the quNV:

NV Center Fluorescence

Optically Detected Magnetic Resonance (ODMR)

Spin Relaxation Time

Magnetic Field Sensing

Key Features

Probe:	HPHT Diamond
Excitation:	520 nm CW Diode Laser
Microwave:	4 GHz RF Sweep Generator
Detection:	Photodiode, Control & Read-Out Unit

Applications

The dynamics of the NV center allow applications like spin initialization and state readout. Therefore, the center is suitable for quantum sensing applications like magnetic field sensing, spin relaxation time measurements and optically detected magnetic resonance (ODMR).

Due to their scalability, long coherence times and ability for interaction with photons, NV centers are of high interest for research in quantum information processing. Qubits can be defined as spin states of single electron or nuclear spins.

Possible applications of the quNV are:

Student lab course experiments

Demonstration experiments in lectures

Hands-on experiments for science centers

Project kits for students’ research centers

Downloads

quNV Flyer	10/2018	0.3 MB	pdf
quNV Datasheet	05/2019	0.3 MB	pdf
quNV Manual	09/2021	0.5 MB	pdf

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