Electronic Journal of Differential Equations,
Conference 04 (2000), pp. 113-120.

Title: Quantum Copying: A Review

Author: Mark Hillery (City University of New York,  NY, USA)
 
Abstract: 
 Quantum information is stored in two-level quantum systems known as qubits.
 The no-cloning theorem states that the state of an unknown qubit cannot 
 be copied. This is in contrast to classical information which can be copied. 
 If one drops the requirement that the copies be perfect it is possible to 
 design quantum copiers. This paper presents a short review of the theory 
 of quantum copying.

Published July 12, 2000.
Math Subject Classifications: 81P68. 
Key Words: Quantum computing; qubits; no-cloning theorem; quantum copying.