Unified universal quantum cloning machine and fidelities
- School of Physics, Peking University, Beijing 100871 (China)
- School of Physics and Electronics, Henan University, Kaifeng 4750011 (China)
- Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
We present a unified universal quantum cloning machine, which combines several different existing universal cloning machines together, including the asymmetric case. In this unified framework, the identical pure states are projected equally into each copy initially constituted by input and one half of the maximally entangled states. We show explicitly that the output states of those universal cloning machines are the same. One importance of this unified cloning machine is that the cloning procession is always the symmetric projection, which reduces dramatically the difficulties for implementation. Also, it is found that this unified cloning machine can be directly modified to the general asymmetric case. Besides the global fidelity and the single-copy fidelity, we also present all possible arbitrary-copy fidelities.
- OSTI ID:
- 22072225
- Journal Information:
- Physical Review. A, Vol. 84, Issue 3; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
Similar Records
Realization of a universal and phase-covariant quantum cloning machine in separate cavities
Asymmetric quantum telecloning of d-level systems and broadcasting of entanglement to different locations using the 'many-to-many' communication protocol