State-Dependent Quantum Copying and the limits of the No-Cloning Theorem

• URL: http://arxiv.org/abs/2507.15432v1
• Date: Mon, 21 Jul 2025 09:44:02 GMT
• Title: State-Dependent Quantum Copying and the limits of the No-Cloning Theorem
• Authors: Guruprasad Kadam,
• Abstract summary: We show how a quantum state, for instance, a photon polarization, can be cloned through light-matter interactions.<n>We demonstrate that stimulated emission offers a concrete physical realization of state-dependent quantum copying.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In this work, we examine the physical process of stimulated emission as a model for state-dependent quantum copying. We explore how a quantum state, for instance, a photon polarization, can be cloned through light-matter interactions when the ancillary system, such as an excited atom, effectively encodes prior information about the quantum state. This process, while resembling quantum cloning, adheres to the no-cloning theorem due to its state-dependent and non-universal nature. We clarify the distinction between universal cloning and conditional copying, and demonstrate that stimulated emission offers a concrete physical realization of state-dependent quantum copying.

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