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Cannot serialize identity gate on Quantum Engine

See original GitHub issue

Description of the issue

Cannot serialize identity gate when using SQRT_ISWAP_GATESET.

How to reproduce the issue

sampler = engine.get_sampler(processor_id='...', gate_set=cg.SQRT_ISWAP_GATESET)
q = cirq.GridQubit(7, 4)
c = cirq.Circuit(cirq.I(q))
r = sampler.run(c, repetitions=1)
...
ValueError: Cannot serialize op cirq.I(cirq.GridQubit(7, 4)) of type <class 'cirq.ops.identity.IdentityGate'>

Cirq version

0.14.0.dev20211210220312

Issue Analytics

State:
Created 2 years ago
Comments:11 (3 by maintainers)

Top GitHub Comments

3reactions

dstrain115commented, Jan 26, 2022

Confirmed with @viathor that we should just strip these gates out when serializing. Let’s do this in CircuitSerializer too. @verult

1reaction

tanujkhattarcommented, Feb 25, 2022

(we can add helper function to do this if needed).

Just FYI: We already have cirq.drop_negligible_operations transformer to achieve this.

https://github.com/quantumlib/Cirq/blob/afb62da0e33559a47135094047ce3a872740a17e/cirq-core/cirq/transformers/drop_negligible_operations.py#L26

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