Quantum cloning with continuous variables
| dc.creator | Cerf, Nicolas J. | |
| dc.date | 2002-10-09 | |
| dc.date.accessioned | 2026-07-07T06:05:11Z | |
| dc.date.available | 2026-07-07T06:05:11Z | |
| dc.description | Cloning machines, that is, transformations that achieve the best approximate copying of a quantum state compatible with the no-cloning theorem, have been a fundamental research topic over the last five years. This study is of particular significance given the close connection between quantum cloning and quantum cryptography: using an optimal cloner generally makes it possible to obtain a tight bound on the best individual eavesdropping strategy in a quantum cryptosystem. In this Chapter, the issue of cloning a continuous-variable quantum system will be analyzed, and a Gaussian cloning transformation will be introduced. This cloner, which copies equally well any two canonically conjugate continuous variables, duplicates all coherent states with a same fidelity (F=2/3). The optical implementation of this cloner and its extension to N-to-M cloners will also be discussed. Finally, the use of this cloner for the security assessment of a quantum key distribution scheme relying on continuous (Gaussian) key carriers will be sketched. | |
| dc.description | To appear in the book "Quantum Information with Continuous Variables", edited by S. L. Braunstein and A. K. Pati, (Kluwer Academic, 2002) | |
| dc.identifier | https://arxiv.org/abs/quant-ph/0210061 | |
| dc.identifier | http://arxiv.org/abs/quant-ph/0210061 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/90554 | |
| dc.subject | Quantum Physics | |
| dc.title | Quantum cloning with continuous variables | |
| dc.type | text |