Encrypted Cloning and the Exact Boundary of the No-Cloning Theorem
Redundancy without replication in quantum information processing
45 min
essay
quantum computing
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The No-Cloning Theorem is a foundational constraint of quantum mechanics, prohibiting the deterministic duplication of arbitrary unknown quantum states. This limitation has profound consequences for quantum computing, shaping how information can be stored, transmitted, protected, and recovered. A recent Physical Review Letters paper, Encrypted Qubits Can Be Cloned, introduces a protocol that appears, at first glance, to challenge this constraint by allowing multiple “clones” of a quantum…
Jan 16, 2026
| Keywords | quantum computing, quantum information theory, no-cloning theorem, encrypted cloning, quantum encryption, unitary dynamics, quantum channel capacity, antidegradable channels, multipartite entanglement, one-time decryption, quantum storage, distributed quantum systems, quantum secret sharing, entanglement monogamy, quantum summoning, quantum error correction, quantum cryptography, information-theoretic security, quantum key management, recoverable redundancy, unitarity constraints |
