scholarly journals Ultimate limits of approximate unambiguous discrimination

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Quntao Zhuang
2013 ◽  
Vol 13 (2) ◽  
pp. 503-511 ◽  
Author(s):  
Wen-Hai Zhang ◽  
Long-Bao Yu ◽  
Zhuo-Liang Cao ◽  
Liu Ye

Chromosoma ◽  
1991 ◽  
Vol 100 (6) ◽  
pp. 371-376 ◽  
Author(s):  
Heinz-Ulrich G. Weier ◽  
Joe N. Lucas ◽  
Marilyn Poggensee ◽  
Richard Segraves ◽  
Daniel Pinkel ◽  
...  

2008 ◽  
Vol 8 (10) ◽  
pp. 951-964
Author(s):  
M. Zhang ◽  
Z.-T. Zhou ◽  
H.-Y. Dai ◽  
D.-W. Hu

Due to the fundamental limitations related to the Heisenberg uncertainty principle and the non-cloning theorem, it is impossible, even in principle, to determine the quantum state of a single system without a priori knowledge of it. To discriminate nonorthogonal quantum states in some optimal way, a priori knowledge of the discriminated states has to be relied upon. In this paper, we thoroughly investigate some impact of a priori classical knowledge of two quantum states on the optimal unambiguous discrimination. It is exemplified that a priori classical knowledge of the discriminated states, incomplete or complete, can be utilized to improve the optimal success probabilities, whereas the lack of a prior classical knowledge can not be compensated even by more resources.


2009 ◽  
Vol 9 (1&2) ◽  
pp. 62-80
Author(s):  
H. Gomez-Sousa ◽  
M. Curty

In this paper, we investigate limitations imposed by sequential attacks on the performance of a differential-phase-shift (DPS) quantum key distribution (QKD) protocol with weak coherent pulses. Specifically, we analyze a sequential attack based on optimal unambiguous discrimination of the relative phases between consecutive signal states emitted by the source. We show that this attack can provide tighter upper bounds for the security of a DPS QKD scheme than those derived from sequential attacks where the eavesdropper aims to identify the state of each signal emitted by the source unambiguously.


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