Optimal symmetric economical phase-covariant quantum cloning

2007 ◽  
Vol 360 (6) ◽  
pp. 726-730 ◽  
Author(s):  
Wen-Hai Zhang ◽  
Long-Bao Yu ◽  
Liu Ye ◽  
Jie-Lin Dai
Keyword(s):  
Quantum Cloning ◽  
Covariant Quantum

Realization of optimal symmetric universal and phase-covariant quantum cloning with quantum dot spins in cavity QED

2012 ◽  
Vol 59 (14) ◽  
pp. 1272-1277 ◽  
Author(s):  
Yan-Qiang Ji ◽  
Tao Yu ◽  
Ai-Dong Zhu ◽  
Hong-Fu Wang ◽  
Shou Zhang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Cavity Qed ◽  
Quantum Cloning ◽  
Covariant Quantum

Suboptimal asymmetric economical phase-covariant quantum cloning and telecloning in d-dimension

2007 ◽  
Vol 369 (1-2) ◽  
pp. 112-119 ◽  
Author(s):  
Wen-Hai Zhang ◽  
Jun Wang ◽  
Liu Ye ◽  
Jie-lin Dai
Keyword(s):  
Quantum Cloning ◽  
Covariant Quantum

IMPLEMENTING THE ECONOMICAL 1 → M PHASE-COVARIANT QUANTUM CLONING VIA THE DETECTION OF CAVITY DECAY

2010 ◽  
Vol 24 (04n05) ◽  
pp. 411-417
Author(s):  
ZHEN YANG ◽  
BAO-LONG FANG ◽  
HONG-BO WAN ◽  
LIU YE
Keyword(s):  
Spontaneous Emission ◽  
Optical Cavity ◽  
Success Probability ◽  
Quantum Cloning ◽  
Covariant Quantum ◽  
Output State ◽  
Cavity Decay ◽  
Automatic Feedback ◽  
M Phase ◽  
Approach Unity

We propose a scheme to realize the economical 1 → M phase-covariant quantum cloning in 2-dimension with M Λ-type three-level atoms in an optical cavity. In our scheme, we do not require addressing and exactly manipulating on every atoms, never so much as controlling the time of interaction between atoms and photon. The success or failure of cloning can be determined simply by detecting the polarization of the photon leaking out of the cavity. With the use of an automatic feedback, the success probability of the scheme can be made to approach unity. And the desired output state is a superposition of different combination of two grounds states and thus is free from decoherence caused by spontaneous emission.

Scheme for Implementation of Ancillary-Free 1 → 3 Optimal Phase-Covariant Quantum Cloning with Trapped Ions

2008 ◽  
Vol 49 (6) ◽  
pp. 1499-1501
Author(s):  
Yang Rong-Can ◽  
Li Hong-Cai ◽  
Lin Xiu ◽  
Huang Zhi-Ping ◽  
Xie Hong
Keyword(s):  
Trapped Ions ◽  
Quantum Cloning ◽  
Covariant Quantum

Generalized asymmetric phase-covariant quantum cloning within a nonextensive approach

2015 ◽  
Vol 15 (1) ◽  
pp. 551-563 ◽  
Author(s):  
R. Boudjema ◽  
A.-H. Hamici ◽  
M. Hachemane ◽  
A. Smida
Keyword(s):  
Quantum Cloning ◽  
Covariant Quantum

OPTICAL IMPLEMENTATION OF THE OPTIMAL UNIVERSAL AND PHASE-COVARIANT QUANTUM CLONING MACHINES

2012 ◽  
Vol 26 (16) ◽  
pp. 1250102
Author(s):  
LIU YE ◽  
XUE-KE SONG ◽  
JIE YANG ◽  
QUN YANG ◽  
YANG-CHENG MA
Keyword(s):  
Quantum Computation ◽  
Quantum Communication ◽  
Beam Splitter ◽  
Linear Optics ◽  
Quantum Cloning ◽  
Horizontal Polarization ◽  
Covariant Quantum ◽  
Experimental Technology ◽  
Symmetric Phase

Quantum cloning relates to the security of quantum computation and quantum communication. In this paper, firstly we propose a feasible unified scheme to implement optimal 1 → 2 universal, 1 → 2 asymmetric and symmetric phase-covariant cloning, and 1 → 2 economical phase-covariant quantum cloning machines only via a beam splitter. Then 1 → 3 economical phase-covariant quantum cloning machines also can be realized by adding another beam splitter in context of linear optics. The scheme is based on the interference of two photons on a beam splitter with different splitting ratios for vertical and horizontal polarization components. It is shown that under certain condition, the scheme is feasible by current experimental technology.

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