qutools quEDU Manual

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quEDU

Education Kit

quADD-NV

Experiment Board

Manual V1.2

Table of Contents

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Summary of Contents for qutools quEDU

Page 1 Education Kit quADD-NV Experiment Board Manual V1.2...
Page 2 Copyright © 2024 by qutools GmbH. The information, specifications and technical data contained in this manual are subject to change at any time by qutools GmbH without prior notice. qutools GmbH assumes no responsibility or liability for any errors or inaccuracies that may appear in this document and any consequences thereof.
Page 3: Table Of Contents
Table of Contents Introduction to quEDU-NV Kit ......................5 Safety and Maintenance ......................... 6 2.1. Legend ............................ 6 2.2. General Instructions ....................... 6 2.3. Environmental Conditions ..................... 6 2.4. Electrical Installation ......................7 2.5. Preventive Maintenance ......................7 2.5.1. Safety Testing ........................7 2.5.2.
Page 4 5.4. Known bugs .......................... 32 quEDU-NV Manual...
Page 5: Introduction To Quedu-Nv Kit
Figure 1 - quEDU control unit on the left connected with a quADD-NV board via data cable and two optical fibers. The quADD-NV is one of the experiment boards, which can be controlled by quEDU. The quEDU-NV set...
Page 6: Safety And Maintenance
Temperature range 5°C to 25°C • Maximum humidity less than 80% RH (non-condensing) at 25°C • To ensure reliable operation the unit should not be exposed to corrosive agents or excessive moisture, heat or dust. If the unit has been stored quEDU-NV Manual...
Page 7: Electrical Installation
The device contains parts sensitive to any kind of liquid. Do not use any type of abrasive pad, scouring powder, or solvent, e.g. alcohol or benzene. Please note that all parts of the unit are cleaned in our production facility. quEDU-NV Manual...
Page 8: Laser Safety
For additional information users should refer to appropriate documents specifying the safety standards such as IEC 60825-1 “Safety of laser products – Part 1: Equipment classification and requirements”. quEDU-NV Manual...
Page 9: Additional Warnings
• Use the provided fiber optic cables. Be careful when connecting fiber optic cables, quEDU and quADD-NV use FC/PC connectors. When storing the fibers, always protect both the fiber tips and the connectors from dust by using the included caps.
Page 10: Device And Technical Data
The quEDU controls all parts of the quADD-NV-board and displays the user interface on a touchscreen. Figure 2: User interface of quEDU-NV. This start screen appears when the quADD-NV is connected to the quEDU. The icons of the actuators are recurring in the menus, parameter settings, and views for better orientation.
Page 11: Actuators And Sensors
The settings of all available actuators and sensors can be accessed at any time through the actuator icons on the bottom right of the quEDU GUI. The user can run their own experiments using these settings and the general views.
Page 12 Avg are in the detector settings because the averaging happens in Param the FPGA and the single shot data is not being transmitted (see the subchapter about pulse generator). Sequence • see the subchapter about pulse generator. quEDU-NV Manual...
Page 13: Views And Displays
Time Plot • This is a time plot of the fiber input 4 of quEDU. It is like the view of the experiment “Laser & NV Alignment”, but it is constantly running without the need to press a “play” button.
Page 14 0 to 1023 parameter values. • The value on the y-axis depends on the detection window and the averaging settings. • See the subchapter about pulse generator for details. quEDU-NV Manual...
Page 15: Pulse Generator
3.4. Pulse generator For all the advanced functions of the quEDU-NV, a fast FPGA is controlling pulse sequences and measuring and analyzing the detected signal. You can either observe a single sequence in the “Sequence Plot” or you can observe the effect of sweeping a parameter through consecutive sequences in the “Parameter Plot”.
Page 16 Start etec on ength rigger on nd Pulse c vated veraged for 1 data point of Parameter Plot Parameter • Detection Start: Start index of the sequence data points to use quEDU-NV Manual...
Page 17 Width depend on the resolution of the sequence data “Res” as well as on “ rigger on Second Pulse”. • Averaging Avg_P: A potential of 2 of these parameter measurements can be averaged together in order to decrease noise and data rate. quEDU-NV Manual...
Page 18: Installation And Operation
4.2. Operation You can control the quADD-NV through the touchscreen and UI of the quEDU. Or you can connect an external PC via network cable and use the quEDU-NV UI from a different device. Therefore, the quEDU has to be in the same network and the GUI can be called via a browser and the quEDUs IP address with the port 8082, e.g.
Page 19 Figure 4 - GUI home screen of the quEDU with a quADD-NV board connected. Three general areas with buttons for experiments with the connected board on the top left, all connected actuators and sensors at the bottom right, and with general views at the bottom left.
Page 20: Experiments
• Load one of the saved diamond positions. You can use the 3 diamond positions determined at the qutools factory, or you can load one of 3 previously saved user positions. • You should see the red signal changing. This can take a few seconds to take effect.
Page 21 Figure 5 - Starting up the green pump laser Figure 6 - The alignment can be manually improved by using small steps of the alignment motors. A medium step size is optimal for a quick check of the best spot. quEDU-NV Manual...
Page 22: Confocal Alignment
You should aim to settle on maximum possible intensity. Please note that it can help to repeat this procedure from time to time during later experiments in order to ensure good alignment because ambient conditions (like temperature) might have changed. quEDU-NV Manual...
Page 23 Figure 7 – A wide area scan shows the position of the three diamonds. Figure 8 - When zoomed into a detail scan, you can select the best spot using crosshairs, and save a position for the next session. quEDU-NV Manual...
Page 24: Laser Pulsing & Photodiode Timing
0 ns is also detected at 0 ns: Move the slider until the rising flank of the pulse is on the leftmost side of the diagram. This must be done in every session since the later experiments depend on a correct setting. quEDU-NV Manual...
Page 25: Magnetometry (Odmr)
Play with the different averaging options and get a feeling of their effects. More averaging (Avg or Avg ) will make the system’s response to a change in magnetic fields slower, Param Display but you will get rid of noise and fluctuations, making your signal clearer. quEDU-NV Manual...
Page 26 • If you leave the current of all three coils close to the maximum value for a long time, you will probably get a temperature warning and eventually the device will shut off the coils as precaution. quEDU-NV Manual...
Page 27 Now one of the frequencies with a dip should be chosen for the next experiments. You can always come back to this experiment and choose another dip: • The measure sliders and the associated go-to buttons help setting the desired frequency. Figure 13 - Selecting a dip with the measurement feature. quEDU-NV Manual...
Page 28: Spin Nutation
The frequency of the microwave was set in the previous experiment “magnetometry” but can also be varied here. • If you do not see any oscillation in the fluorescence in the beginning of the MW pulse, maybe you haven’t chosen a single dip (NV orientation) from the O R spectrum. quEDU-NV Manual...
Page 29 Figure 15 - In the Nutation Experiment, the microwave is pulsed while the laser is on the whole time. The state of the NV centers is starting to oscillate, and when the microwave turns off again, the system is optically pumped to the bright state. quEDU-NV Manual...
Page 30: Rabi Oscillation
A typical Rabi frequency at maximum Mw power is about 1 MHz. • You can also observe the effect the chosen measurement window timing can have on the measurement by changing the detection window start and width. quEDU-NV Manual...
Page 31: Update
4.4. Update In case you want to update or restore the software of the control unit, please contact qutools GmbH: info@qutools.com. quEDU-NV Manual...
Page 32: Troubleshooting
Check if you are aiming at a diamond, as you can see the red glow through the protection cover of the quADD-NV. • If the diamond glows, but you have no red signal in the “ ime plot” of quEDU check the Photodiode gain and/or tweak the position of the objective. •...

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