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quCR Manual Version 3.2 (October 16, 2019)
www.qutools.com
quCR Manual Version 3.2 Page 1
Page 1: ...quCR Manual Version 3 2 October 16 2019 www qutools com quCR Manual Version 3 2 Page 1...
Page 2: ...on This manual describes the controller of qutools quED entanglement demonstrator It features a laser diode controller a coincidence counter and a twin APD 1 photon counting module The laser diode con...
Page 3: ...ning o the controller 1 2 Installation For the installation and connection of the quED controller please refer to the quED User s and Operation Manual delivered with the system 1 3 Power To switch on...
Page 4: ...press on the rotary encoder while manipulating a data eld brings you back to the default value Laser on o switch 4 The laser switch in the right lower corner switches the laser on and o When it is swi...
Page 5: ...6 Not used in user mode USB 7 Type A USB host connector Can be used to connect a USB memory stick or e g the external stepper motor driver optional Serial 8 Serial connector Not used in user mode Las...
Page 6: ...play the internal status of the APD module Power LED Temp LED Meaning on ashing Internal temperature i e the temperature of the APDs themselves out of bounds e g during start up trying to reach desire...
Page 7: ...minutes to let the APD module cool down 5 Restart the system observing how the LEDs of the APD module are behaving 6 If they still report a problem call qutools support The most probable cause for th...
Page 8: ...tasks Each of those four modules can be selected via the sidebar The sidebar is always visible on the right most side of the touch panel You can cycle through the di erent tabs of each module by repe...
Page 9: ...emission is turned on or o see gure 3 The data elds Actual Current and Actual Temperature display the respective values measured by the controller They should be close to the corresponding Set values...
Page 10: ...rized user such as maximum and minimum of the laser diode set values Additionaly you can change the rate of the proportional and integral part of the temperature feedback loop After setting those valu...
Page 11: ...elp you perform a measurement of the bell inequality to register a Hong Ou Mandel dip or to generate random numbers The rst three tabs are named 1 Rates 2 Graph 3 Multipliers and Settings 5 3 1 Rates...
Page 12: ...ed to start and stop the plot The Clear Clr button is used to erase the data in the plot The autorange button toggles autoranging of the y axis and nally The button with the USB symbol is used for sav...
Page 13: ...Figure 7 The second tab of the quCNT module with the di erent rates depicted in a graph Figure 8 The third tab of the quCNT module with the various multipliers and settings www qutools com quCR Manual...
Page 14: ...be used as a random number generator if at least three di erent APDs channels 0 1 and 2 are installed in your hardware You can toggle the RNG mode by pressing the respective button as seen in gure 9 A...
Page 15: ...d by a measure ment of the visibility of the two photon correlations in mutually unbiased bases If the polarizers in front of the detectors are mounted in motorized stages and attached to the quMotor...
Page 16: ...the polarizers for each of the 16 settings and click the according tab do trigger the coincidence measurement Once all measurements are completed the CHSH inequality is evaluated and the result is dis...
Page 17: ...5 3 The quCNT Module Figure 12 Tab for measurement of the CHSH inequality Figure 13 Tab for measurement of the Houg Ou Mandel e ect www qutools com quCR Manual Version 3 2 Page 17...
Page 18: ...M dip by scanning 1 mm then the next and so on The data acquired can be stored on an attached ash drive with the USB button 5 4 The quMotor Module The quMotor module is controlled with this tab which...
Page 19: ...otors to arbitrary values Visibility PIP o ers hotkeys for the eight angular combinations necessary to measure the visibility of an output state CHSH PIP o ers hotkeys for the 16 angular combinations...
Page 20: ...g circle you can retry by pressing the Reset button on the left After you successfully entered the pass phrase the quInfo Module immediately switches to the Info and USB Update tab described in sectio...
Page 21: ...5 5 The quInfo Module Figure 16 The tab used for switching to the standard mode Figure 17 The Info and USB Update tab www qutools com quCR Manual Version 3 2 Page 21...
Page 22: ...software without any restrictions Additionally in the info tab the md5 checksum of the running binary is displayed Please compare it to the value provided with the update to verify the integrity of th...
Page 23: ...which can be chosen in the quCNT tabs described in sections 5 3 1 and 5 3 2 A checked box in the left column will show the respective button an unchecked box will hide it so you can t see it at all T...
Page 24: ...5 5 The quInfo Module Figure 19 The Rates Con guration tab www qutools com quCR Manual Version 3 2 Page 24...
Page 25: ...works ne If prompted for a password use qut00lsMUNICH You will then get access to the screen of the quCR and all its functionalities 6 2 HTTP Interface The quCR can also be controlled via HTTP For th...
