T1 experiments#
In this section we show how to run T1 experiments.
T1#
Due to coupling to the environment the qubit in state
Parameters#
- class qibocal.protocols.coherence.t1.T1Parameters(delay_before_readout_start: int, delay_before_readout_end: int, delay_before_readout_step: int, single_shot: bool = False)[source]
T1 runcard inputs.
- hardware_average: bool = False
By default hardware average will be performed.
- single_shot: bool = False
If
True
save single shot signal data.
- delay_before_readout_start: int
Initial delay before readout [ns].
- delay_before_readout_end: int
Final delay before readout [ns].
- delay_before_readout_step: int
Step delay before readout [ns].
- nshots: int
Number of executions on hardware.
- relaxation_time: float
Wait time for the qubit to decohere back to the gnd state.
Example#
A possible runcard to launch a T1 experiment could be the following:
- id: t1
operation: t1
parameters:
delay_before_readout_end: 10000
delay_before_readout_start: 4
delay_before_readout_step: 100
nshots: 1000
The expected output is the following:
![../../_images/t1_prob.png](../../_images/t1_prob.png)
Requirements#
T1 with raw signal#
A standard t1_signal
.
The acquisition and the fitting procedure are exactly the same, the only difference being that on the y axis it will be displayed the raw measurements from the instruments.
Parameters#
- class qibocal.protocols.coherence.t1_signal.T1SignalParameters(delay_before_readout_start: int, delay_before_readout_end: int, delay_before_readout_step: int, single_shot: bool = False)[source]
T1 runcard inputs.
- delay_before_readout_start: int
Initial delay before readout [ns].
- delay_before_readout_end: int
Final delay before readout [ns].
- delay_before_readout_step: int
Step delay before readout [ns].
- single_shot: bool = False
If
True
save single shot signal data.
- hardware_average: bool = False
By default hardware average will be performed.
- nshots: int
Number of executions on hardware.
- relaxation_time: float
Wait time for the qubit to decohere back to the gnd state.
Example#
- id: T1 with signal
operation: t1_signal
parameters:
delay_before_readout_end: 100008
delay_before_readout_start: 16
delay_before_readout_step: 1000
nshots: 2048
![../../_images/t1_signal.png](../../_images/t1_signal.png)
Note that in this case error bands will not be provided.
Requirements#
T1 with for loops#
If the instrument driver is not able to perform duration sweepers in real time, we provide a protocol where the different waiting time are swept through a python for loop. Such execution will be usually slower compared to the one where sweepers are supported but it could be useful for debugging purposes.
Here is a possible runcard:
- id: T1 with for loops
operation: t1_sequences
parameters:
delay_before_readout_end: 100008
delay_before_readout_start: 16
delay_before_readout_step: 1000
nshots: 2048
Note
For t1_sequences
on the y-axis it will be shown the raw output from instruments,
not the population of