Create a new condition that allows easy control by bitmasks and Add a new classical Update the notebook for 'Classical control' to reflect new features" by NoureldinYosri · Pull Request #7166 · quantumlib/Cirq

NoureldinYosri · 2025-03-19T22:29:14Z

This PR creates BitMaskKeyCondition a condition that can be used to create multiqubit classical conditions with bitmasks. This will be much easier than using sympy indexedbase

cc: @ikd-sci

Examples:

Any bit from 0, 2, 3 => 0b1101 = 13

In [4]: cond = cirq.BitMaskKeyCondition('m', bitmask=13)
   ...: c = cirq.Circuit(
   ...:     cirq.H.on_each(qs),
   ...:     cirq.measure(qs, key='m'),
   ...:     cirq.Y(cirq.q(5)).with_classical_controls(cond),
   ...: 
   ...: )
   ...: c
Out[4]: 
0: ───H───M────────────────────────────
          ║
1: ───H───M────────────────────────────
          ║
2: ───H───M────────────────────────────
          ║
3: ───H───M────────────────────────────
          ║
4: ───H───M────────────────────────────
          ║
5: ───────╫───Y(conditions=[m & 13])───
          ║   ║
m: ═══════@═══^════════════════════════

Contains 0b1011 = 11 as bitmask

In [5]: cond = cirq.BitMaskKeyCondition.create_equal_mask('m', bitmask=11)
   ...: c = cirq.Circuit(
   ...:     cirq.H.on_each(qs),
   ...:     cirq.measure(qs, key='m'),
   ...:     cirq.Y(cirq.q(5)).with_classical_controls(cond),
   ...: 
   ...: )
   ...: c
Out[5]: 
0: ───H───M────────────────────────────────────
          ║
1: ───H───M────────────────────────────────────
          ║
2: ───H───M────────────────────────────────────
          ║
3: ───H───M────────────────────────────────────
          ║
4: ───H───M────────────────────────────────────
          ║
5: ───────╫───Y(conditions=[(m & 11) == 11])───
          ║   ║
m: ═══════@═══^════════════════════════════════

Doesn't contain 11 as a bitmask

In [6]: cond = cirq.BitMaskKeyCondition.create_not_equal_mask('m', bitmask=11)
   ...: c = cirq.Circuit(
   ...:     cirq.H.on_each(qs),
   ...:     cirq.measure(qs, key='m'),
   ...:     cirq.Y(cirq.q(5)).with_classical_controls(cond),
   ...: 
   ...: )
   ...: c
Out[6]: 
0: ───H───M────────────────────────────────────
          ║
1: ───H───M────────────────────────────────────
          ║
2: ───H───M────────────────────────────────────
          ║
3: ───H───M────────────────────────────────────
          ║
4: ───H───M────────────────────────────────────
          ║
5: ───────╫───Y(conditions=[(m & 11) != 11])───
          ║   ║
m: ═══════@═══^════════════════════════════════

update the notebook to reflect the upgraded sympy support from #6914 and the new bitmask condition from #7165

codecov · 2025-03-19T23:45:59Z

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.14%. Comparing base (c50ce1e) to head (c9cdc67).
Report is 1 commits behind head on main.

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@@           Coverage Diff           @@
##             main    #7166   +/-   ##
=======================================
  Coverage   98.14%   98.14%           
=======================================
  Files        1100     1100           
  Lines       96147    96241   +94     
=======================================
+ Hits        94365    94459   +94     
  Misses       1782     1782

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daxfohl

Lgtm. All my concerns were addressed in previous PR.

dstrain115

LGTM minus some nits.

dstrain115 · 2025-03-30T20:14:33Z

cirq-core/cirq/protocols/json_serialization.py

+def attrs_json_dict(obj: Any) -> Dict[str, Any]:
+    """Return a dictionary suitable for `_json_dict_` from an attrs dataclass."""
+    attribute_names = [f.name for f in attrs.fields(type(obj))]
+    return obj_to_dict_helper(obj, attribute_names)


Can you add a unit test for this function?

dstrain115 · 2025-03-30T20:15:46Z

cirq-core/cirq/value/condition.py

+    """A multiqubit classical control condition with a bitmask.
+
+    The control is based on a single measurement key and allows comparing equality or inequality
+    after taking the bitwise and with a bitmask.


Should we have a short blurb about the bit order of the measurement (or a reference to the measurement code that explains)?

dstrain115 · 2025-03-30T20:16:40Z

cirq-core/cirq/value/condition.py

+    @staticmethod
+    def create_equal_mask(
+        key: 'cirq.MeasurementKey', bitmask: int, *, index: int = -1
+    ) -> 'BitMaskKeyCondition':


Add docstring.

dstrain115 · 2025-03-30T20:16:44Z

cirq-core/cirq/value/condition.py

+    @staticmethod
+    def create_not_equal_mask(
+        key: 'cirq.MeasurementKey', bitmask: int, *, index: int = -1
+    ) -> 'BitMaskKeyCondition':


Add docstring.

… new classical Update the notebook for 'Classical control' to reflect new features" (quantumlib#7166) * Create a new condition that allows easy control by bitmasks * add tests * docstring * add missing files * swith from dataclasses to attrs * mypy * Update the notebook for 'Classical control' to reflect new features * nit * nit * tests * nit * fix doc regex * format * address comments * lint

NoureldinYosri and others added 10 commits March 19, 2025 12:02

Create a new condition that allows easy control by bitmasks

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docstring

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Merge branch 'main' into main

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add missing files

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swith from dataclasses to attrs

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mypy

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Update the notebook for 'Classical control' to reflect new features

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nit

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Merge branch 'main' into classical_control_docs

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NoureldinYosri changed the title ~~Update the notebook for 'Classical control' to reflect new features"~~ Create a new condition that allows easy control by bitmasks and Add a new classical Update the notebook for 'Classical control' to reflect new features" Mar 21, 2025

NoureldinYosri mentioned this pull request Mar 21, 2025

Create a new condition that allows easy control by bitmasks #7165

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NoureldinYosri and others added 2 commits March 21, 2025 16:48

Merge branch 'main' into classical_control_docs

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nit

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NoureldinYosri marked this pull request as ready for review March 21, 2025 23:55

NoureldinYosri requested review from a team and vtomole as code owners March 21, 2025 23:55

NoureldinYosri requested review from daxfohl, maffoo and pavoljuhas March 21, 2025 23:55

daxfohl approved these changes Mar 22, 2025

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NoureldinYosri and others added 6 commits March 25, 2025 00:30

tests

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Merge branch 'main' into classical_control_docs

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Merge branch 'main' into classical_control_docs

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nit

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fix doc regex

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format

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dstrain115 approved these changes Mar 30, 2025

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address comments

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Merge branch 'main' into classical_control_docs

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NoureldinYosri enabled auto-merge March 31, 2025 18:31

lint

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NoureldinYosri added this pull request to the merge queue Mar 31, 2025

Merged via the queue into quantumlib:main with commit 8a3d1ef Mar 31, 2025
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NoureldinYosri deleted the classical_control_docs branch March 31, 2025 19:05

mhucka mentioned this pull request Apr 18, 2025

Improve reporting of errors & efficiency of pr-size-labeler #7288

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This was referenced May 30, 2025

Support serializing sweeps with numpy values #7398

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Update RB to reduce the size of the generated circuits #7411

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This was referenced Aug 5, 2025

Add a new transformer that performs random pauli insertion #7558

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update the RB fitting method to compensate for the standard deviation induced from the random number generator #7562

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NoureldinYosri mentioned this pull request Sep 11, 2025

Create a gauge for idle moments #7648

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NoureldinYosri mentioned this pull request Sep 25, 2025

fix bug in idle moments gauge #7669

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NoureldinYosri mentioned this pull request Oct 21, 2025

Remove xfail from QSD tests #7712

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Create a new condition that allows easy control by bitmasks and Add a new classical Update the notebook for 'Classical control' to reflect new features"#7166

Create a new condition that allows easy control by bitmasks and Add a new classical Update the notebook for 'Classical control' to reflect new features"#7166
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NoureldinYosri commented Mar 19, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Examples:

Any bit from 0, 2, 3 => 0b1101 = 13

Contains 0b1011 = 11 as bitmask

Doesn't contain 11 as a bitmask

Uh oh!

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