Physics – Quantum Physics
Scientific paper
2006-12-19
Phys. Rev. A 75, 022306 (2007)
Physics
Quantum Physics
6 pages, 3 figures. appear in Phys. Rev. A
Scientific paper
10.1103/PhysRevA.75.022306
We propose a scheme for continuous-variable quantum cloning of coherent states with phase-conjugate input modes using linear optics. The quantum cloning machine yields $M$ identical optimal clones from $N$ replicas of a coherent state and $N$ its replicas of phase conjugate. This scheme can be straightforwardly implemented with the setup accessible at present since its optical implementation only employs simple linear optical elements and homodyne detection. Compared with the original scheme for continuous variables quantum cloning with phase-conjugate input modes proposed by Cerf and Iblisdir [Phys. Rev. Lett. 87, 247903 (2001)], which utilized a nondegenerate optical parametric amplifier, our scheme loses the output of phase-conjugate clones and is regarded as irreversible quantum cloning.
Chen Haixia
Zhang Jing
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