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Updated: Jun 28, 2026

Standardized Modular Assembly of Polycistronic Operons with Modular Cloning (MoClo) using the In-Cloning toolkit
Published on: September 2, 2025
Optimal cloning of unitary transformation
Giulio Chiribella1, Giacomo Mauro D'Ariano, Paolo Perinotti
1QUIT Group, Dipartimento di Fisica "A. Volta" and INFN Sezione di Pavia, via Bassi 6, 27100 Pavia, Italy. chiribella@fisicavolta.unipv.it
Abstract:
After proving a general no-cloning theorem for black boxes, we derive the optimal universal cloning of unitary transformations, from one to two copies. The optimal cloner is realized by quantum channels with memory, and greatly outperforms the optimal measure-and-reprepare cloning strategy. Applications are outlined, including two-way quantum cryptographic protocols.
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