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arXiv · 2501.02757

Encrypted Qubits can be Cloned

Koji Yamaguchi·Achim Kempf
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Abstract

We show that encrypted cloning of unknown quantum states is possible. Any number of encrypted clones of a qubit can be created through a unitary transformation, and each of the encrypted clones can be decrypted through a unitary transformation. The decryption of an encrypted clone consumes the decryption key, i.e., only one decryption is possible, in agreement with the no-cloning theorem. Encrypted cloning represents a new paradigm that provides a form of redundancy, parallelism or scalability where direct duplication is forbidden by the no-cloning theorem. For example, a possible application of encrypted cloning is to enable encrypted quantum multi-cloud storage.

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Koji Yamaguchi, Achim Kempf. 2025-01-06. Encrypted Qubits can be Cloned. https://doi.org/10.1103/y4y1-1ll6

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