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Depth-1 distinctness for pseudorandom unitaries

The paper proves that a tensor-product ensemble of independently chosen single-qubit Clifford gates is negl(n)\operatorname{negl}(n)-distinct when the number of queries is polynomial in nn. This disproves the authors' conjecture that negligibly distinct ensembles must necessarily be entangling. As an application, the depth-logn\log n global Clifford/unitary-22-design layer used in the PFCPFC pseudorandom-unitary construction can be replaced by a single depth-1 layer of local single-qubit 22-designs while preserving the required distinctness property.

Exact FrontierDelta

Prior state unknowndisproved

Scope and record

Occurred: Sep 2, 2026

Delta type: SOURCE CLAIM

Assumptions: VibeMathed verification: unreviewed. Publication: preprint. AI contribution: ai-discovered. VibeMathed editorial classifications, scores, notes, relations, and dataset structure are CC BY 4.0. Source statements and linked content retain their own rights.

Canonical aliases: Depth-1 distinctness for pseudorandom unitaries

Confidence: Not scored

Registry verification: unreviewed · preprint · resolved

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Attribution

VibeMathed
registry · event recorded by

ChatGPT 5.6 Sol
model · ai model contributor · OpenAI

Asad Raza
human · human collaborator

Jens Eisert
human · human collaborator

Bill Fefferman
human · human collaborator

Lineage and corrections

This event attributed to Bill Fefferman

Depth-1 distinctness for pseudorandom unitaries parent of this event

This event attributed to ChatGPT 5.6 Sol

Depth-1 distinctness for pseudorandom unitaries evidence for this event

This event attributed to Asad Raza

VibeMathed record: Depth-1 distinctness for pseudorandom unitaries evidence for this event

The paper proves that a tensor-product ensemble of independently chosen single-qubit Clifford gates is negl(n)\operatorname{negl}(n)-distinct when the number of queries is polynomial in nn. This disproves the authors' conjecture that negligibly distinct ensembles must necessarily be entangling. As an application, the depth-logn\log n global Clifford/unitary-22-design layer used in the PFCPFC pseudorandom-unitary construction can be replaced by a single depth-1 layer of local single-qubit 22-designs while preserving the required distinctness property. parent of this event

This event attributed to Jens Eisert

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