Resilience to decoherence of the macroscopic quantum superpositions generated by universally covariant optimal quantum cloning

被引：4
|
作者：
Spagnolo, Nicolo [1 ,2 ]
Sciarrino, Fabio [1 ,3 ]
De Martini, Francesco [1 ,4 ]
机构：
[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
[2] Consorzio Interuniv Sci Fis Materia, I-00185 Rome, Italy
[3] Ist Nazl Ottica, I-50125 Florence, Italy
[4] Accademia Nazl Lincei, I-00165 Rome, Italy
来源：
PHYSICAL REVIEW A | 2010年 / 82卷 / 03期
关键词：
STATE;
D O I：
10.1103/PhysRevA.82.032325
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We show that the quantum states generated by universal optimal quantum cloning of a single photon represent a universal set of quantum superpositions resilient to decoherence. We adopt the Bures distance as a tool to investigate the persistence of quantum coherence of these quantum states. According to this analysis, the process of universal cloning realizes a class of quantum superpositions that exhibits a covariance property in lossy configuration over the complete set of polarization states in the Bloch sphere.
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页数：7
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