scholarly journals Photonic families of non-Gaussian entangled states and entanglement criteria for continuous-variable systems

2012 ◽  
Vol 85 (6) ◽  
Author(s):  
Ryo Namiki
Keyword(s):  
Continuous Variable ◽  
Entangled States ◽  
Non Gaussian

scholarly journals Detection of non-Gaussian entangled states with an improved continuous-variable separability criterion

2016 ◽  
Vol 93 (3) ◽  
Author(s):  
Anaelle Hertz ◽  
Evgueni Karpov ◽  
Aikaterini Mandilara ◽  
Nicolas J. Cerf
Keyword(s):  
Continuous Variable ◽  
Entangled States ◽  
Separability Criterion ◽  
Non Gaussian

scholarly journals Non-Gaussian postselection and virtual photon subtraction in continuous-variable quantum key distribution

2016 ◽  
Vol 93 (1) ◽  
Author(s):  
Zhengyu Li ◽  
Yichen Zhang ◽  
Xiangyu Wang ◽  
Bingjie Xu ◽  
Xiang Peng ◽  
...  
Keyword(s):  
Quantum Key Distribution ◽  
Virtual Photon ◽  
Key Distribution ◽  
Continuous Variable ◽  
Photon Subtraction ◽  
Non Gaussian

scholarly journals DECAY OF COHERENCE AND ENTANGLEMENT OF A SUPERPOSITION STATE FOR A CONTINUOUS VARIABLE SYSTEM IN AN ARBITRARY HEAT BATH

2010 ◽  
Vol 08 (05) ◽  
pp. 755-763
Author(s):  
G. W. FORD ◽  
R. F. O'CONNELL
Keyword(s):  
Sudden Death ◽  
Heat Bath ◽  
Continuous Variable ◽  
Time Development ◽  
Gaussian State ◽  
Entanglement Sudden Death ◽  
Equation Approach ◽  
Superposition State ◽  
Master Equation Approach ◽  
Non Gaussian

We consider the case of a pair of particles initially in a superposition state corresponding to a separated pair of wave packets. In contrast to a previous related work, we avoid a master equation approach and we calculate exactly the time development of this non-Gaussian state due to interaction with an arbitrary heat bath. We find that coherence decays continuously, as expected. We then investigate entanglement and find that at a finite time the system becomes separable (not entangled). Thus, we see that entanglement sudden death is also prevalent in continuous variable systems which should raise concern for the designers of entangled systems.

QUANTUM KEY DISTRIBUTION WITH FOUR ALPHABETIC LETTERS NON-GAUSSIAN MODULATION USING SQUEEZING STATES

2010 ◽  
Vol 08 (05) ◽  
pp. 779-786
Author(s):  
SHENG ZHANG ◽  
JIAN WANG ◽  
CHAO-JING TANG ◽  
QUAN ZHANG
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
Squeezed States ◽  
Binary Modulation ◽  
Optimal Coefficient ◽  
Non Gaussian ◽  
Modulation Coefficient ◽  
Attack Strategy

We present a new non-Gaussian quantum key distribution (QKD) protocol using squeezed states. Compared with a binary modulation, the efficiency can be improved when a four alphabetic letters modulation is chosen. We then analyze the security of the protocol under a collective entangling cloner attack, which is a powerful attack strategy in continuous variable QKD. We also show how the modulation coefficient affects the key rate, then the key rate can be maximized by choosing an optimal coefficient.

scholarly journals Preparation of distilled and purified continuous-variable entangled states

2008 ◽  
Vol 4 (12) ◽  
pp. 915-918 ◽  
Author(s):  
Boris Hage ◽  
Aiko Samblowski ◽  
James DiGuglielmo ◽  
Alexander Franzen ◽  
Jaromír Fiurášek ◽  
...  
Keyword(s):  
Continuous Variable ◽  
Entangled States
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