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Add CPMG to T2 experiment #3001

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dstrain115 opened this issue May 13, 2020 · 0 comments · Fixed by #3255
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Add CPMG to T2 experiment #3001

dstrain115 opened this issue May 13, 2020 · 0 comments · Fixed by #3255
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@dstrain115
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area/experiments area/google kind/feature-request Describes new functionality triage/accepted A consensus emerged that this bug report, feature request, or other action should be worked on
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0.9.0

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@dstrain115
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The T2 decay experiment currently supports T2 and T2*, also known as Hahn echo and Ramsey, but it would be nice to also support a CPMG style T2 experiment.
@dstrain115 dstrain115 self-assigned this May 13, 2020
@dstrain115 dstrain115 mentioned this issue May 13, 2020
Merged
@balopat balopat added this to the 0.9.0 milestone Jul 28, 2020
dstrain115 added a commit to dstrain115/Cirq-1 that referenced this issue Aug 20, 2020
@dstrain115
Add CPMG to T2 experiment
c7d1484 
- This adds Carr-Purcell-Meiboom-Gill pulse sequences to the T2
experiment.
- This sequence has the following sequence:
π/2, t, π, 2t, π, ... 2t, π, t

Since there are two variables (N pulses and t delay), this allows
the user to modify either variable or both to create a 2d scan.

In order to accomplish this efficiently, the pi-pulses are encoded as
parameterized X gates, e.g. X ** sympy.symbol('pulse_3') which is
only turned on for more than 3 pulses.

- Fixes quantumlib#3001
@dstrain115 dstrain115 mentioned this issue Aug 20, 2020
Merged
@balopat balopat added area/experiments area/google kind/feature-request Describes new functionality triage/accepted A consensus emerged that this bug report, feature request, or other action should be worked on labels Aug 27, 2020
dstrain115 added a commit that referenced this issue Sep 11, 2020
@dstrain115
Add CPMG to T2 experiment (#3255)
054fa07 
* Add CPMG to T2 experiment

- This adds Carr-Purcell-Meiboom-Gill pulse sequences to the T2
experiment.
- This sequence has the following sequence:
π/2, t, π, 2t, π, ... 2t, π, t

Since there are two variables (N pulses and t delay), this allows
the user to modify either variable or both to create a 2d scan.

In order to accomplish this efficiently, the pi-pulses are encoded as
parameterized X gates, e.g. X ** sympy.symbol('pulse_3') which is
only turned on for more than 3 pulses.

- Fixes #3001
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area/experiments area/google kind/feature-request Describes new functionality triage/accepted A consensus emerged that this bug report, feature request, or other action should be worked on
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Add CPMG to T2 experiment dstrain115/Cirq-1
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@balopat @dstrain115