Image Watermarking Algorithm Based on the Code Division Multiple Access Technique

2006 ◽  
pp. 204-211 ◽  
Author(s):  
Fan Zhang ◽  
Guosheng Yang ◽  
Xianxing Liu ◽  
Xinhong Zhang
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Image Watermarking ◽  
Code Division Multiple ◽  
Access Technique ◽  
Multiple Access Technique

scholarly journals Quantum multiplexing with optical coherent states

2009 ◽  
Vol 9 (7&8) ◽  
pp. 573-593
Author(s):  
J.C. Garcia-Escartin ◽  
P. Chamorro-Posada
Keyword(s):  
Coherent States ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Computation Model ◽  
Optical Tools ◽  
Single Qudit ◽  
Code Division Multiple ◽  
The Cost ◽  
Access Technique ◽  
Original Information

In this paper, we propose a novel quantum multiple access technique based on optical coherent states. The information of several coherent state optical qubits is combined into a single qudit, which is the superposition of almost orthogonal coherent states. The original information is encoded into a new Hilbert space with the help of a quantum multiplexer (QMUX) and then recovered at the other end with a quantum demultiplexer (QDEMUX). We introduce the optical tools that complete the coherence state quantum computation model and give the desired circuits. The proposed system can admit a number of users above the optimal limit at the cost of a degradation of the transmitted data. In this and some other aspects, it can be regarded as a quantum analogue of classical Code Division Multiple Access techniques.

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