Qubit spectroscopy
An important step in controlling a qubit is figuring out its resonance frequency. Here we perform a spectroscopy to do exactly that.
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ConfigThe configuration defines the quantum element rr
the readout resonator, and qubit
the one we're measuring.
We define the 2 inputs, one for the I
component and one for the Q
component for both quantum elements.
Furthermore, we define one operation for the qubit
- the saturation
and the corresponding pulse saturation_pulse
.
The saturation_pulse
is defined for several T1 lengths to ensure the qubit's response.
In addition, we define the readout
operation on the readout resonator, to measure the qubit's response using the rr
element. The readout_pulse
pulse is defined as non-zero on the I component only as we're intrested just in the magnitude
of the response.
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ProgramThe program qubit_spectroscopy
consists out of two loops. The outer used for averaging
and the inner using for a frequency scan. We define the range of fequencies to scan using python variables and then loop
over those with a qua for_
loop. In each cycle we update the qubit's frequency that we want to examine and play a
saturation pulse to the qubit. Then, we use the align
command and wait for the saturation pulse to be done.
Afterwards, we measure the readout resonator and save the IQ components.
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Post ProcessingNo post processing provided. One needs to use the extracted I,Q values to determine the resonance frequency by the response spectrum.